Job Board | Japanese recruitment agency

Senior Rust Backend Engineer (SR)

Permanent

Full-time

案件ID:

75294

公開日:

2026-08-28

概要

Career Opportunity for a Senior Rust Backend Engineer in Japan!

■ Senior Rust Backend Engineer

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

■ Your Role and Responsibilities

● Own the architecture and technical direction of high-performance trading APIs (HTTP & WebSocket) supporting low-latency order entry, market data distribution, and account state updates.

● Lead the design and implementation of structured concurrency using the Tokio runtime, defining best practices for task lifecycle management, cancellation semantics, backpressure, and graceful degradation under load.

● Develop and maintain real-time state ingestion pipelines:

● Process append-only logs (e.g., trades, order updates, book diffs).

● Rebuild local states efficiently using snapshot + diff application.

● Model trading-related data structures, including orders, fills, trades, positions, funding, and liquidation logic.

● Implement WebSocket connection logic, including upgrade handling, frame parsing, and data fanout for subscribed clients.

● Design observable backend systems with rich metrics, structured logging, and distributed tracing for performance insights and failure analysis.

● Collaborate with system and infrastructure engineers to continuously improve performance, scalability, and fault tolerance.

● Write comprehensive unit, integration, and load tests to ensure stability under production conditions.

■ Experience and Qualifications

● Rust Expertise

● 5+ years of professional backend engineering experience, with 3+ years of Rust in production.

● Strong experience with the Tokio async runtime and concurrent programming patterns.

● Deep understanding of structured concurrency and robust handling of spawned task cancellation.

● Hands-on experience with HTTP and WebSocket frameworks such as Hyper or similar.

Trading Literacy

● Solid understanding of CEX/DEX systems and trading models.

● Familiarity with data modeling for trading entities (orders, trades, positions, funding, mark price, margin, liquidation logic, etc.).

● Prior hands-on trading or market data experience (personal or professional).

State Ingestion & Processing

● Expertise in real-time data streaming and processing systems.

● Ability to design systems that rebuild local state efficiently from snapshots and diffs.

● Familiarity with replay, recovery, and correctness guarantees in event- driven systems.

■ Additional Preferred Qualifications

● Performance Engineering

● Deep understanding of lock-free or lock-avoidant data structures

● Experience designing cache-friendly data layouts and optimizing for memory locality in latency-sensitive systems.

● Proficiency in profiling CPU and memory performance and able to diagnose and optimize latencies in real-time event pipelines

● DevOps & CI/CD

● Familiarity with Docker-based environments and CI/CD pipelines.

■ Good Reasons to Join

● Join a highly technical startup environment where engineers have

significant ownership and direct product impact.

■ Work Location

Tokyo, Japan

Details will be provided during the meeting.

更に読む申請する

Senior Frontend Engineer (SR)

Japan

Permanent

Full-time

案件ID:

75292

公開日:

2026-08-28

概要

Career Opportunity for a Senior Frontend Engineer in Japan!

■ Senior Frontend Engineer

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

■ Your Role and Responsibilities

● Frontend architecture & technical contributions: Contribute to the evolution of frontend system design, patterns, and best practices.

● Application development: Design, build, and maintain complex, production-grade frontend applications using TypeScript and TanStack Start.

● State management & data orchestration: Implement and maintain scalable client-side state using Zustand and TanStack Query to ensure predictable and performant data flows.

● Project ownership: Own and deliver end-to-end frontend workstreams,

including:

Core wallet and account abstraction UX flows
High-throughput, data-rich product interfaces
New web and mobile dApp surfaces

● Testing & reliability: Contribute to and maintain Playwright-based end-to-end test suites to improve coverage and release confidence.

● Cross-functional collaboration: Partner with Product, Design, and Backend teams to refine requirements and deliver high-quality outcomes.

■ Experience and Qualifications

● 2 ~ 4 years of experience as a frontend engineer

● Strong proficiency in TypeScript and modern JavaScript.

● Experience with TanStack Start or comparable meta-frameworks (e.g. Next.js, Remix).

● Solid expertise in modern React patterns, performance optimization, and frontend application design.

● Ability to operate independently in ambiguous, fast-paced environments.

● Excellent written and verbal communication skills.

■ Additional Preferred Qualifications

● Experience leveraging AI-assisted coding tools (Cursor, Copilot, Claude, or similar) to accelerate development.

● Background in web3, blockchain, or decentralized application development.

● Experience in startup or scale-up environments.

■ Good Reasons to Join

● Gain exposure to collaborations with leading technology, financial, and enterprise organizations.

■ Work Location

Tokyo, Japan

Details will be provided during the meeting.

更に読む申請する

Senior Rust Blockchain Engineer

Permanent

Full-time

案件ID:

75296

公開日:

2026-08-28

概要

Career Opportunity for a Senior Rust Blockchain Engineer in Japan!

■ Senior Rust Blockchain Engineer

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

■ Your Role and Responsibilities

● Architect and implement the on-chain order book and matching engine in Rust.

● Design and extend exchange-specific logic (order execution, risk checks, account/state management).

● Design and develop protocol-level components, such as state transition logic, consensus, validator interaction, and transaction processing pipelines.

● Implement integration with oracles, bridges, and external data providers, ensuring correctness and resilience in adversarial conditions.

● Optimize for low-latency execution, concurrency, and gas efficiency.

● Conduct benchmarking and stress testing to identify and address potential performance/throughput bottlenecks.

● Develop and maintain a comprehensive suite of unit, integration, and end-to-end tests to ensure code reliability and functionality.

■ Experience and Qualifications

● 5+ years of systems programming experience, with 3+ years in Rust.

● Proven track record building trading platforms, execution engines, or exchanges (DEX or centralized).

● Contributions to Rust-based L1 protocol projects (e.g., Solana, Cosmos SDK, Substrate).

● Deep understanding of distributed computing principles, including consensus algorithms, peer-to-peer (P2P) networking, and high-performance data structures.

● Deep knowledge of decentralized trading models (on-chain order books, AMMs, hybrid architectures).

● Ability to design and implement complex, production-grade systems independently.

■ Additional Preferred Qualifications

● Experience with competitive programming or algorithmic problem solving.

● Expertise in low-latency design, concurrency, and performance optimization.

■ Good Reasons to Join

● Gain exposure to collaborations with leading technology, financial, and enterprise organizations.

■ Work Location

Tokyo, Japan

Details will be provided during the meeting.

更に読む申請する

QA Engineer (Test Automation)

Permanent

Full-time

案件ID:

75295

公開日:

2026-08-28

概要

Career Opportunity for a QA Engineer in Japan!

■ QA Engineer (Test Automation)

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

■ Your Role and Responsibilities

● Define QA standards, release criteria, and quality metrics.

● Design, build, and maintain scalable E2E automated test frameworks (e.g., Playwright) (80–90% of the role involves building automation).

● Validate trading logic: execution paths, price impact, fee calculations, and thousands of user paths (Strium).

● Modernize, optimize, and expand existing E2E testing infrastructure.

● API testing: verify consistency between backend responses and frontend behavior.

● API load and stress testing designed for high-throughput environments.

● Design reproducible test environments and test data.

● Collaborate with engineering and product teams to define "testable acceptance criteria."

■ Experience and Qualifications

● Candidates must have at least 5 years of professional experience and advanced English proficiency, and meet at least three of the following criteria (English is the company's official language):

● At least 5 years of QA experience with web, mobile, financial systems, or Fintech products, including at least 2 years of test automation experience.

● Proven track record of building E2E test frameworks (e.g., Playwright, Cypress, Appium, Selenium) from scratch.

● Ability to write test automation code (this is a coding-intensive QA role; JavaScript/TypeScript is ideal, but Java/Python are also acceptable. Since the existing E2E infrastructure and frontend are built using JS/TS, you will be expected to get up to speed on these after joining).

● Experience testing complex Fintech or financial products, having navigated both technical complexities (e.g., transaction integrity, asynchronous processing) and organizational complexities (e.g., development involving multiple teams and stakeholders).

● Experience designing highly maintainable automated test suites integrated into CI pipelines.

● Ability to work autonomously as the sole QA professional for a product or team. Ability to proactively clarify requirements across teams, even when specifications are ambiguous

● Experience taking ownership of defining quality standards and test strategies, and driving the team to implement them (organization size is not a factor; the role requires building systems/processes rather than simply executing pre-defined tests)

● English proficiency beyond a conversational level (English is the official company language; native-level fluency is not required)

● Curiosity and a drive to quickly learn and assimilate knowledge in unfamiliar domains (prior blockchain experience is not required)

■ Additional Preferred Qualifications

● Experience with E2E automation for exchanges, securities, or financial systems

● Knowledge of blockchain, smart contracts, and on-chain transactions

● Practical experience with load testing tools (e.g., k6, Artillery)

● Experience using AI tools for test generation and test operations

● Understanding of trading concepts (slippage, liquidity, execution flow)

■ Good Reasons to Join

● Gain exposure to collaborations with leading technology, financial, and enterprise organizations.

■ Work Location

Tokyo, Japan

Details will be provided during the meeting.

更に読む申請する

Senior Back-end Engineer (SR)

Permanent

Full-time

案件ID:

75293

公開日:

2026-08-28

概要

Career Opportunity for a Senior Backend Engineer in Japan!

■ Senior Backend Engineer (TypeScript / Web3)

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

■ Your Role and Responsibilities

● Take ownership of backend architecture and implementation across multiple products within the company’s ecosystem.

● Design, build, and maintain scalable production APIs and backend services used by customer-facing applications.

● Build and operate high-performance distributed systems capable of serving large user bases and handling significant production traffic reliably.

● Design backend systems with strong focus on scalability, fault tolerance, reliability, and long-term maintainability.

● Build and maintain data pipelines, background workers, asynchronous processing systems, and event-driven architectures.

● Build and maintain blockchain integrations and indexing systems that ingest, process, and serve on-chain data to internal services and user-facing applications.

● Design efficient database schemas, optimize complex queries, and ensure long-term scalability of data storage systems.

● Work across both Web2 and Web3 backend infrastructure, integrating traditional backend systems with blockchain protocols and decentralized infrastructure.

● Diagnose and solve complex production issues, performance bottlenecks, reliability problems, and scaling challenges.

● Build systems with strong observability, monitoring, alerting, and operational tooling.

● Continuously improve backend architecture, deployment pipelines, system reliability, and engineering practices.

● Move quickly, make sound technical decisions independently, and take ownership of delivering production-ready systems.

■ Experience and Qualifications

● Extensive experience building and operating production backend systems in modern engineering environments.

● Strong proficiency in TypeScript and modern backend frameworks (NestJS, Fastify, Express, or similar).

● Strong understanding of backend architecture, API design, service-oriented architecture, and distributed systems design.

● Ability to independently design and deliver complex backend systems with minimal oversight.

Large-Scale Systems Experience

● Proven track record building and operating backend systems serving large numbers of users in production environments.

● Experience designing systems that operate reliably under high traffic, heavy workloads, and demanding production conditions.

Data & Infrastructure

● Deep expertise with PostgreSQL, including schema design, indexing, query optimization, migrations, and production database management.

● Experience building systems that process large amounts of structured or event-driven data.

● Strong understanding of observability, logging, monitoring, and service health management.

Web2 + Web3 Engineering

● Experience building backend systems for modern Web2 applications.

● Experience integrating with blockchain infrastructure, node APIs, smart contracts, or decentralized protocols.

■ Additional Preferred Qualifications

● Experience building backend services in Go.

● Experience with Kafka, NATS, RabbitMQ, or similar messaging systems.

● Experience deploying and operating services using Docker and modern CI/CD pipelines.

● Contributions to open-source backend, infrastructure, or blockchain tooling projects.

● Strong understanding of the DeFi ecosystem and hands-on familiarity with products such as decentralized exchanges, lending protocols, staking systems, bridges, or other on-chain financial infrastructure.

■ Good Reasons to Join

● Join a highly technical startup environment where engineers have significant ownership and direct product impact.

■ Work Location

Tokyo, Japan

Details will be provided during the meeting.

更に読む申請する

Backend-Engineer-PK

Permanent

Full-time

案件ID:

75254

公開日:

2026-08-27

概要

PayPay Securities Backend Engineer (V4)

Backend Engineer

About PayPay Securities / PayPay証券について PayPay is a FinTech company that has surpassed 70 million users (as of July 2025) in 7 years since its launch in 2018, is rapidly expanding its business scale as a payment platform used by approximately one out of every two smartphone users in Japan. PayPay Securities Corporation provides a unique and familiar asset management service that anyone can easily use in their daily lives as a specialized smartphone brokerage firm that can be used through PayPay. As a member of the PayPay Group, we are refining our products at an overwhelming speed that no other company can imitate, and we will promote the spread of cashless payments in Japan and the financial life platform that uses them at a dash. We are looking for people who are passionate about these things as professionals, who can identify issues on their own, and who can work together with others to create new value. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. 2018年にサービスを開始してから約7年でユーザー数7,000万人（2025年7月時点）を突破したフィンテック企業である「PayPay」は日本国内においてスマホユーザーのおよそ2人に1人が使用する決済プラットフォームとして急速に事業規模を拡大しています。 PayPay証券株式会社は「PayPay」から使用できるスマホ専業証券会社として「資産運用」を日常の中で誰もが簡単にできるユニークで身近な資産運用サービスを提供しています。他社に真似できない圧倒的なスピードでプロダクトを磨き上げ、日本のキャッシュレス決済、またそれを使用した金

融ライフプラットフォームとしての普及を一気に推進することにプロフェッショナルとして情熱を持って取り組み、ユー

ザーの為に新しい価値創出を共に推進する仲間を募集します。 ※ PayPay証券株式会社へご応募いただく際にはPayPay株式会社、PayPayカード株式会社へ併願応募はご遠慮いただいております。ご了承ください。

Job Description / 業務について PayPay Securities, as an important part of PayPay’s financial ecosystem, has launched “Point Management” with over 20 million users and “PayPay Asset Management, the first initiative in Japan that enables asset management on a payment application. Now that the business foundation of the financial ecosystem is finally in place, we intend to expand our business to change the structure of asset management in Japan, with the main target being those who have not yet started asset management or were not interested in it before. To achieve our goal, PayPay Securities is preparing to bring in technical talents not only from Japan but also globally, just as we have done with PayPay’s product division. As a Backend Engineer, you will be collaborating with engineers, designers and QAs, and working in an environment where you can be one of the founding members to build up a new organization within PayPay Securities. PayPay証券はPayPayの金融エコシステムの重要な一角を担う企業として、2,000万ユーザーを超える「ポイント運用」と、決済アプリ上で資産運用ができる日本初の取り組みである「PayPay資産運用」をスタートさせました。ようやく金融エコシステムの事業基盤が整ったところで、日本の資産運用の構造を変えるべく、これからはまだ資産運用を

始めていない方や関心がない方たちをメインターゲットと捉えて事業を拡大させていきます。

そのためにPayPay証券のエンジニアリング部門は、PayPayと同様なレベルでの技術力と開発スピードの向上および内製化を進めています。日本国内に限らず海外からも優秀な人材を迎え入れるグローバル組織を構築する予定です。（英語力については

翻訳チームやWebツールを活用しながら入社後に学んで頂く形でも問題はありません）

Highlights of the opportunity / ポジションの魅力:

Be part of the team to build up a new organization and environment Develop skills in making business plans from a high perspective, through the high-level

coordination with departments and affiliated companies within PayPay Group to support the top management’s decision

Gain experience in a company that aiming to be the pioneer in the market to provide a brand new Mobile Securities services, which never had before during the era of Financial reformation

Able to utilize PayPay’s services and user base

新しい組織・環境を一緒に作り上げることができる点経営トップの意思決定サポートや各部門・PayPayを始めとした関係会社とのハイレベルな調整を通じ、高

い視点に立った企画立案能力を獲得することができる点金融業界の変革期のなかで、これまでにない新しいモバイル証券サービスの提供を目指す当社において、

業界の最前線にて業務経験を積むことができる点 PayPayのサービス・ユーザー基盤を活用できる点

Responsibilities / 主な担当業務:

Develop and operate the Backend Application system for PayPay Securities product (PHP, Java, SpringBoot, Kotlin, MySQL/AuroraDB)

Design large scale systems with high complexity to support our high throughput applications Understand how to leverage infrastructure for solving such large scale problems Develop tools and contribute to open source wherever possible Adopt problem solving as a way of life – always go to root cause!

PayPay証券プロダクトが接続するバックエンドアプリケーションの開発と運用（PHP、Java、SpringBoot、

Kotlin, MySQL/AuroraDB）複雑性の高い大規模システムを設計し、高スループットのアプリケーションを提供するシステム課題を解決するためのインフラストラクチャの活用方法を理解し実装する可能な限りツールを開発し、またオープンソースに貢献する問題解決思考で行動し、常に根本原因を追求する

Qualifications / 必要なスキル・経験 :

3-5 experience in developing Backend Application for company products Experience in using Java/PHP under professional environment, or if you are non-Java user,

excellent skills in generalized programming languages, such as Scala, Python and Go. Interest and ability to learn other coding languages as needed. Experience with NoSQL databases and distributed cache. Strong fundamentals in data structures, algorithms and object oriented programming In-depth understanding of concurrency and distributed computing Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in

SaaS platform development

Business level in either English or Japanese (JLPT N1)

3~5年の自社プロダクトのバックエンド開発経験 Java/PHPの実務経験。またはScala、Python、Goなどの一般的なプログラミング言語の優れたスキル

必要に応じて他のプログラミング言語を学ぶ興味を持っていること NoSQLデータベースや分散キャッシュの使用経験データ構造、アルゴリズム、オブジェクト思考プログラミングの基礎を理解していること並列処理と分散コンピューティングを深く理解していること日本語（日本語能力試験N1同等レベル）もしくは英語ビジネスレベル

Preferred Qualifications / あると望ましいスキル・経験:

Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database Clients

Experience with AWS services Experience in system design, development of web system which handles massive amount of

transactions or requires scalability Experience with Microservices Experience in working for system development in securities, finance, or similar industries Experience in developing inhouse Product/Service

RESTful API、Pub/Subシステム、データベースクライアントなどのプラットフォームコンポーネントの実装

経験 AWSサービスの利用経験システム設計、大量トランザクションを扱うアプリ/Webプロダクト、スケーラビリティを必要とするアプリ/Web

プロダクトの開発経験マイクロサービスの経験証券・金融業界での開発経験インハウスでの自社サービス運用経験

The ideal candidates at PayPay Securities / PayPay証券が求める人物像

PayPay 5 senses

Working Conditions

Employment Status

Full Time

Office Location

Hybrid Workstyle (flexible working style including Remote and office)　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　※There are no fixed rules regarding office attendance in Product group; it depends on each individual's discretion.

Work Hours

Super Flex Time (No Core Time)

https://www.paypay-sec.co.jp/corporate/recruit/

In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break)

Holidays

Every Sat/Sun/National holidays (In Japan) Summer break (2 days / generally taken between July 1st and September 30th / subject to

change depending on month of employment) Year-end and New Year holidays (12/31-1/3)

Paid leave

Annual paid leave (1 to 10 days depending on the month of joining will be granted upon employment date)

Salary

Annual salary paid in 12 installments (monthly) Based on skills, experience and abilities Review once a year Overtime allowance, Late overtime allowance, Commuting and transportation expenses, Work

style support allowance

Benefits

Social Insurances (Health insurance, Employee pension, Employment insurance and Industrial accident compensation insurance)

401K

待遇・条件雇用形態

正社員

勤務地

自宅または本社

勤務時間

スーパーフレックス制（コアタイム無し）原則：午前9時～午後17時45分（実働7.75時間＋休憩時間 1時間）

休日

完全週休2日制（土日祝）有給休暇（入社時付与あり／入社月に応じて1日〜10日付与）夏季休暇（2日／原則7/1-9/30の間に取得／入社月に応じて変動あり）年末年始休暇（12/31-1/3）

休暇（法定休暇および会社福利厚生）

年次有給休暇(初年度10日間、入社月に応じて按分付与、入社日から使用可）

給与

年俸制経験、スキル、業績、貢献度に応じ当社規定により決定昇給（年1回）時間外勤務手当、深夜勤務手当、通勤交通費、WorkStyle支援金

ベネフィット

社会保険（健康保険、厚生年金、雇用保険、労災保険）企業型確定拠出年金（401k）

About PayPay Securities / PayPay証券について
- Highlights of the opportunity / ポジションの魅力:
- Responsibilities / 主な担当業務:
- Preferred Qualifications / あると望ましいスキル・経験:
- The ideal candidates at PayPay Securities / PayPay証券が求める人物像
- Employment Status
- Office Location
- Work Hours
- Holidays
- Paid leave
- Salary
- Benefits
待遇・条件
- 勤務地
- 勤務時間
- 休日
- 給与
- ベネフィット

更に読む申請する

Frontend Engineer---PK

Permanent

Full-time

案件ID:

75253

公開日:

2026-08-27

概要

PayPay Securities Frontend Engineer (V4)

Frontend Engineer

About PayPay Securities / PayPay証券について PayPay is a FinTech company that has surpassed 70 million users (as of July 2025) in 7 years since its launch in 2018, is rapidly expanding its business scale as a payment platform used by approximately one out of every two smartphone users in Japan. PayPay Securities Corporation provides a unique and familiar asset management service that anyone can easily use in their daily lives as a specialized smartphone brokerage firm that can be used through PayPay. As a member of the PayPay Group, we are refining our products at an overwhelming speed that no other company can imitate, and we will promote the spread of cashless payments in Japan and the financial life platform that uses them at a dash. We are looking for people who are passionate about these things as professionals, who can identify issues on their own, and who can work together with others to create new value. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. 2018年にサービスを開始してから約7年でユーザー数7,000万人（2025年7月時点）を突破したフィンテック企業である「PayPay」は日本国内においてスマホユーザーのおよそ2人に1人が使用する決済プラットフォームとして急速に事業規模を拡大しています。 PayPay証券株式会社は「PayPay」から使用できるスマホ専業証券会社として「資産運用」を日常の中で誰もが簡単にできるユニークで身近な資産運用サービスを提供しています。他社に真似できない圧倒的なスピードでプロダクトを磨き上げ、日本のキャッシュレス決済、またそれを使用した金

融ライフプラットフォームとしての普及を一気に推進することにプロフェッショナルとして情熱を持って取り組み、ユー

ザーの為に新しい価値創出を共に推進する仲間を募集します。 ※ PayPay証券株式会社へご応募いただく際にはPayPay株式会社、PayPayカード株式会社へ併願応募はご遠慮いただいております。ご了承ください。

Job Description / 業務について PayPay Securities, as an important part of PayPay’s financial ecosystem, has launched “Point Management” with over 20 million users and “PayPay Asset Management, the first initiative in Japan that enables asset management on a payment application. Now that the business foundation of the financial ecosystem is finally in place, we intend to expand our business to change the structure of asset management in Japan, with the main target being those who have not yet started asset management or were not interested in it before. To achieve our goal, PayPay Securities is preparing to bring in technical talents not only from Japan but also globally, just as we have done with PayPay’s product division. As a Frontend Engineer, you will be collaborating with engineers, designers and QAs, and working in an environment where you can be one of the founding members to build up a new organization within PayPay Securities. ※ Please note that this job is for Japan Residents Only

PayPay証券はPayPayの金融エコシステムの重要な一角を担う企業として、2,000万ユーザーを超える「ポイント運用」と、決済アプリ上で資産運用ができる日本初の取り組みである「PayPay資産運用」をスタートさせました。ようやく金融エコシステムの事業基盤が整ったところで、日本の資産運用の構造を変えるべく、これからはまだ資産運用を

始めていない方や関心がない方たちをメインターゲットと捉えて事業を拡大させていきます。そのためにPayPay証券のエンジニアリング部門は、PayPayと同様なレベルでの技術力と開発スピードの向上および内製化を進めています。日本国内に限らず海外からも優秀な人材を迎え入れるグローバル組織を構築する予定です。（英語力については

翻訳チームやWebツールを活用しながら入社後に学んで頂く形でも問題はありません） Highlights of the opportunity / ポジションの魅力:

Be part of the team to build up a new organization and environment Develop skills in making business plans from a high perspective, through the high-level

coordination with departments and affiliated companies within PayPay Group to support the top management’s decision

Gain experience in a company that aiming to be the pioneer in the market to provide a brand new Mobile Securities services, which never had before during the era of Financial reformation

Able to utilize PayPay’s services and user base

新しい組織・環境を一緒に作り上げることができる点経営トップの意思決定サポートや各部門・PayPayを始めとした関係会社とのハイレベルな調整を通じ、高

い視点に立った企画立案能力を獲得することができる点金融業界の変革期のなかで、これまでにない新しいモバイル証券サービスの提供を目指す当社において、

業界の最前線にて業務経験を積むことができる点 PayPayのサービス・ユーザー基盤を活用できる点

Responsibilities / 主な担当業務:

Development and operation of products using web technologies, including PayPay Securities mini-applications, PC trading sites, and business management tools

Work closely with Product Managers and Product Designers to customize the asset management and investment experience

Prototype development of new features and renewal designs Technical tasks including unit test improvements and architecture improvements, etc.

PayPay証券ミニアプリ、PC取引サイト、業務管理ツールなどWeb技術を利用したプロダクトの開発と運用プロダクトマネージャーやプロダクトデザイナーと密接に連携し、資産運用・投資体験をカスタマイズする新機能開発やリニューアルデザインのプロトタイプ開発ユニットテストの改善やアーキテクチャ改善を含む技術タスクなど

Tech Stack

｜TypeScript, JavaScript, HTML/CSS ｜Vue.js, NestJS ｜Docker, AWS, GH Actions, Terraform ｜GitHub, npm/pnpm, vite, i18n, Storybook ｜Sentry, OpenSearch, Google Analytics, Firebase, Grafana

｜Figma, PlantUML, draw.io ｜Slack, Zoom, Confluence, Jira Qualifications / 必要なスキル・経験 :

3-5 years of in-house web product development experience Working experience with HTML/CSS, JavaScript, Vue.js, TypeScript Knowledge of modern web development methods and JavaScript related frameworks Experience with Rest API integration Ability to work with a strong sense of ownership Business level in either English or Japanese (Native Japanese speaker or JLPT N1

equivalent)

3~5年の自社Webプロダクト開発の実務経験 HTML/CSS, JavaScript, Vue.js, TypeScriptの実務経験モダンなWeb開発手法、JavaScript関連のフレームワークに対する知識を保有している Rest APIの統合経験強いオーナーシップを持ち業務遂行できること日本語（日本語が母国語、もしくは、日本語能力試験N1同等レベル）英語に苦手意識がないこと（業務において必要であれば通訳を介します）

Preferred Qualifications / あると望ましいスキル・経験:

Experience developing Securities and Finance related applications Experience developing functionality while implementing unit tests (TDD) Experience with Agile development Experience in Front-end performance monitoring and optimization Experience building Front-end CI/CD infrastructure and deployment pipelines Experience in in-house service operation

証券・金融関連のアプリ開発経験ユニットテストを実装しながら機能開発を行った経験（TDD）アジャイル開発の経験フロントエンドのパフォーマンスモニタリングと最適化の経験フロントエンドのCI/CDインフラの構築とデプロイパイプラインの構築経験インハウスでの自社サービス運用経験英語（ビジネスレベルでの会話が可能なレベル）

The ideal candidates at PayPay Securities / PayPay証券が求める人物像

PayPay 5 senses

Working Conditions

Employment Status Full Time

https://www.paypay-sec.co.jp/corporate/recruit/

Office Location

Hybrid Workstyle (flexible working style including Remote and office)　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　※There are no fixed rules regarding office attendance in Product group; it depends on each individual's discretion.

Work Hours

Super Flex Time (No Core Time) In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break)

Holidays

Every Sat/Sun/National holidays (In Japan) Summer break (2 days / generally taken between July 1st and September 30th / subject to

change depending on month of employment) Year-end and New Year holidays (12/31-1/3)

Paid leave

Annual paid leave (1 to 10 days depending on the month of joining will be granted upon employment date)

Salary

Annual salary paid in 12 installments (monthly) Based on skills, experience and abilities Review once a year Overtime allowance, Late overtime allowance, Commuting and transportation expenses, Work

style support allowance

Benefits

Social Insurances (Health insurance, Employee pension, Employment insurance and Industrial accident compensation insurance)

401K

待遇・条件

雇用形態

正社員

勤務地

自宅または本社

勤務時間

スーパーフレックス制（コアタイム無し）原則：午前9時～午後17時45分（実働7.75時間＋休憩時間 1時間）

休日

完全週休2日制（土日祝）有給休暇（入社時付与あり／入社月に応じて1日〜10日付与）夏季休暇（2日／原則7/1-9/30の間に取得／入社月に応じて変動あり）年末年始休暇（12/31-1/3）

休暇（法定休暇および会社福利厚生）

年次有給休暇(初年度10日間、入社月に応じて按分付与。入社日から使用可）

給与

年俸制経験、スキル、業績、貢献度に応じ当社規定により決定昇給（年1回）時間外勤務手当、深夜勤務手当、通勤交通費、WorkStyle支援金

ベネフィット

社会保険（健康保険、厚生年金、雇用保険、労災保険）企業型確定拠出年金（401ｋ）

About PayPay Securities / PayPay証券について
- Responsibilities / 主な担当業務:
- Tech Stack
- Preferred Qualifications / あると望ましいスキル・経験:
- The ideal candidates at PayPay Securities / PayPay証券が求める人物像
Working Conditions
- Office Location
- Work Hours
- Holidays
- Paid leave
- Salary
- Benefits
待遇・条件
- 雇用形態
- 勤務地
- 勤務時間
- 休日
- 給与
- ベネフィット

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Senior Software Engineer (Tech Lead)-PK

Permanent

Full-time

案件ID:

75210

公開日:

2026-08-26

概要

Rakuten Senior Software Engineer (Tech Lead) - Ad Product Section, Global Ad Technology Supervisory Department (GATD)

Senior Software Engineer (Tech Lead) - Ad Product Section,

Global Ad Technology Supervisory Department (GATD) Job Description: Department Overview Rakuten is a leading global e-commerce company. Our mission is to contribute to society by creating

value through innovation and entrepreneurship At Rakuten, we drive disruptive innovation, engaging knowledge, creativity and passion from around

the world to achieve ambitious goals and help build communities in which people can pursue their dreams and live in happiness.

Ad Product Section boasts a highly motivated, skilled, talented, and friendly team spread across Tokyo, Singapore, India, and China. We are looking for someone who can quickly integrate and collaborate effectively with our team.

We are seeking a dynamic full-stack software engineer to take on technical ownership and responsibilities throughout the product and project development lifecycle. The ideal candidate will possess the ability to solve a wide range of technical and business challenges. We are looking for a tech-savvy individual who is unafraid to step out of their comfort zone and explore new technologies.

Position: Position Details This role offers the opportunity to build a robust tech career by developing multiple products within

Rakuten's expansive ecosystem and innovative technology cluster. Roles and Responsibilities 1) Project Execution - Requirement gathering and analysis - Convert business requirement to tech requirement - System design - Coding and implementation - Code review and maintain code quality/standard - Unit testing, verification, validation - Deployment/Rollback operation for DEV, STG, PROD - After-release monitoring, regular maintenance 2) Collaboration - Working closely with the project manager, tech lead, architect and other project members - Collaborate with a separate QA team and DevOps team - Collaborate with cross-culture, cross-border development team during the project execution 3) Always Improve, Always Advance

- Understand the whole product and system and suggest the technical improvements - Understand the future business and product needs and suggest system improvement in advance - Think one step ahead, verify up-coming technology and prepare roadmaps to utilize those Mandatory Qualifications: - More than 7 years of hands-on software development experience as a Software Engineer - Strong technical design and implementation skill - Strong analytical and problem-solving skill - Complete and hands-on experience of Agile development and SCRUM - Team player and easy going person - Proactive, self-starter and self-motivated - Perform under immense pressure - Good communication skills with tech/non-tech people - Strong get-things-done mind with a sense of ownership - Experience using AI tool like Cursor to improve the code quality and productivity Technical - Java spring (Boot+Batch) - MySQL - NoSQL (MongoDB) - GCS, BigQuery, Dataproc - Kafka - Version Control - Git - Jira or similar project and task management tool 　 Desired Qualifications: Technical - Big Data (Hadoop, Hive, Spark) - REACT, ANGULAR - NoSQL (Couchbase, Cassandra, Redis) - Big Data (Tez, Presto) - Test Automation JUnit - Code Quality - Sonar - Streaming platform - Kafka, RabbitMQ - CI/CD - Jenkins - BI Tool - MicroStrategy, Tableau - The experience about enterprise system architecture design such as data pipeline design Additional information on Location

Futako Tamagawa Rise Office

Senior Software Engineer (Tech Lead) - Ad Product Section, Global Ad Technology Supervisory Department (GATD)

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Senior Rust Backend Engineer-PK

Permanent

Full-time

案件ID:

75169

公開日:

2026-08-25

概要

Senior Rust Backend Engineer

About Us

In partnership with one of the largest financial conglomerates, we aim to bring the majority of Japanese equities on-chain, creating a secure, transparent, and high-performance trading infrastructure that can support institutional volumes while remaining accessible to retail participants. We are building a next-generation decentralized exchange with a fully on-chain order book. Our system is built with a custom state transition function and consensus layer, purpose-designed for high-performance, low-latency trading. The goal is to deliver a trustless platform that matches the speed and efficiency of traditional trading engines while providing full transparency by running execution as close as possible to the blockchain itself.

Position Overview

We are seeking a Senior Rust Backend Engineer experienced in building high-performance, reliable trading APIs (HTTP & WebSocket). You will be responsible for designing, implementing, and optimizing the backend services that power our exchange interfaces - ensuring low latency, resilience, and correctness under load.

You’ll work on high-throughput, real-time systems that handle order and trade data ingestion, manage live WebSocket feeds, and maintain internal state consistency from streaming market events. The ideal candidate is both a strong Rust engineer and a system thinker, capable of reasoning about concurrency, data flow, and observability in production environments.

This role offers an opportunity to shape the architecture of our trading backend at an early stage, working alongside a distributed team of seasoned engineers building next-generation financial infrastructure.

Key Responsibilities

Own the architecture and technical direction of high-performance trading APIs (HTTP & WebSocket) supporting low-latency order entry, market data distribution, and account state updates.
Lead the design and implementation of structured concurrency using the Tokio runtime, defining best practices for task lifecycle management, cancellation semantics, backpressure, and graceful degradation under load.
Develop and maintain real-time state ingestion pipelines:
- Process append-only logs (e.g., trades, order updates, book diffs).
- Rebuild local states efficiently using snapshot + diff application.
Model trading-related data structures, including orders, fills, trades, positions, funding, and liquidation logic.
Implement WebSocket connection logic, including upgrade handling, frame parsing, and data fanout for subscribed clients.
Design observable backend systems with rich metrics, structured logging, and distributed tracing for performance insights and failure analysis.
Collaborate with system and infrastructure engineers to continuously improve performance, scalability, and fault tolerance.
Write comprehensive unit, integration, and load tests to ensure stability under production conditions.

Requirements

Rust Expertise

5+ years of professional backend engineering experience, with 3+ years of Rust in production.
- Strong experience with the Tokio async runtime and concurrent programming patterns.
- Deep understanding of structured concurrency and robust handling of spawned task cancellation.
- Hands-on experience with HTTP and WebSocket frameworks such as Hyper or similar.

Trading Literacy

Solid understanding of CEX/DEX systems and trading models.
Familiarity with data modeling for trading entities (orders, trades, positions, funding, mark price, margin, liquidation logic, etc.).
Prior hands-on trading or market data experience (personal or professional).

State Ingestion & Processing

Expertise in real-time data streaming and processing systems.
Ability to design systems that rebuild local state efficiently from snapshots and diffs.
Familiarity with replay, recovery, and correctness guarantees in event-driven systems.

WebSocket Engineering

Understanding of connection upgrades, frame parsing, and data fanout for subscribed clients.

Observability Engineering

Ability to design and instrument systems for metrics, logging, and tracing.
Experience with Prometheus and OpenTelemetry in production.
Track record of diagnosing and resolving performance bottlenecks and production incidents.

Big Bonus

Performance Engineering

Deep understanding of lock-free or lock-avoidant data structures
Experience designing cache-friendly data layouts and optimizing for memory locality in latency-sensitive systems.
Proficiency in profiling CPU and memory performance and able to diagnose and optimize latencies in real-time event pipelines

DevOps & CI/CD

Familiarity with Docker-based environments and CI/CD pipelines.

Why Join Us

Work on cutting-edge trading infrastructure bridging traditional and decentralized finance.
Collaborate with a world-class, distributed engineering team.
Influence critical technical decisions from the early stages.
Competitive compensation and growth opportunities in a rapidly evolving space.

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【年収～3,500万＋RSU】英AIスタートアップ日本立ち上げ（IBD・PE・コンサル出身歓迎｜Tech経験不要）_as

Tokyo

Permanent

Full-time

案件ID:

74850

公開日:

2026-08-13

概要

GTM Lead

Job Title: GTM Lead

Devision: Member of the Product & Growth Team

Location: NY / Madrid / Tokyo / Singapore / Paris

Company Overview:

Model ML is the AI workflow builder transforming how major financial institutions

produce and validate client-ready work. Model ML converts complex, manual

processes into fully automated AI systems that scale across global teams. In

under a year, Model ML has become one of the fastest growing enterprise AI

platforms worldwide and recently closed a $75 million Series A, one of the largest

fintech Series A rounds ever. The round was backed by FT Partners, Y

Combinator, LocalGlobe, QED, 13books, and other top global investors.

Job Description:

The role involves managing the sales lifecycle, from lead generation to customer

service to product feedback & iteration.

Key Responsibilities:

Develop and implement a comprehensive sales strategy for the region.

Identify potential clients, including investment banks, wealth and asset

managers, private equity firms and relevant consultancies.

Oversee the entire sales lifecycle.

Foster and maintain strong relationships with industry key stakeholders.

GTM Lead 1

Work closely with internal teams to guarantee a seamless customer

experience.

Represent the company at industry events and conferences to increase brand

awareness and generate leads.

What you can expect:

It won't be easy; in fact, it will be very hard.

BUT, it will be a lot of fun.

You need to be comfortable in being uncomfortable; timelines will change,

priorities will most likely shift.

Be prepared to sacrifice your work-life balance in exchange for joining an

incredible journey and learning a lot along the way.

Requirements:

Proven B2B sales experience having scaled sales functions in a venture back

environment is essential.

Minimum of 5 years experience with investment banks, wealth and asset

managers, private equity firms or tier 1 consultancies is essential.

Strong academic background from tier 1 institutions.

MBA is a bonus but not required.

Excellent communication, organisation and interpersonal skills. This is key

given we are a currently a small global team working around the clock.

Ability to work independently and make autonomous decisions.

Willingness to travel within the region as needed.

What We Offer:

Competitive salary + equity

Performance-based incentives.

GTM Lead 2

Opportunity to be instrumental in our expansion into the region.

Supportive and innovative work environment.

To conclude, we're building a team of like-minded, incredibly smart, tenacious

individuals with relentless work ethic and focus, all driving towards our very clear

revolutionary mission. If you match this description, buy into that mission and

you're at a career stage where you're ready to make your defining statement to

the world, please apply.

About the interview Our Process

We're very conscious of everyone's time, so we want to make the process as

efficient as possible.

Call 1 30-minute intro call with Jonny GTM Lead) If you proceed

Call 2 30-minute call with a Product & Growth team member

Call 3 20-minute call with a Nat CoS

Call 4 20-minute call with Chaz CEO

GTM Lead 3

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