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.

Career Opportunity for a Firmware / Embedded Software Engineer (Robotics) in Japan!

■ Firmware / Embedded Software Engineer (Robotics)

■ Company Overview

A research-driven organization at the intersection of AI and robotics, focused on advancing next-generation intelligent systems through cutting-edge research and real-world applications.

■ Your Role and Responsibilities 

● Design, implement, and verify firmware and embedded software for humanoids, dual-arm robots, robotic hands, and teleoperation systems

● Control devices such as motors, sensors, actuators, and communication modules

● Develop robotics control platforms using MCUs, SoCs, Linux-based embedded systems, RTOS, and related technologies

● Design and implement inter-device communication using CAN, UART, SPI, I2C, USB, Ethernet, and other protocols

● Develop logging and diagnostic functions for sensor values, joint angles, torque, current, temperature, error states, and other system data

● Design interfaces between low-level control layers and higher-level robotics software platforms such as ROS / ROS 2

● Ensure the stability and reproducibility required for teleoperation, leader–follower systems, and data collection pipelines

● Conduct real-robot testing, failure analysis, root-cause investigation, and design improvements to prevent recurrence

● Integrate systems in collaboration with Mechanical, Electrical, AI, Robotics, and Cloud teams

● Improve the reliability, operability, and scalability of robotic systems used in research projects

■ Experience and Qualifications

● Practical experience in embedded software or firmware development using C / C++

● Development experience using MCUs, SoCs, Linux-based embedded systems, or RTOS

● Experience developing software that controls real hardware such as sensors, actuators, and motors

● Experience with implementation or real-hardware debugging using communication interfaces

● Experience debugging real hardware using oscilloscopes, logic analyzers, debuggers, and similar tools

● Experience analyzing and improving issues in systems involving electrical, mechanical, and software components

● Business-level Japanese proficiency (equivalent to JLPT N2 or above)

■ Additional Preferred Qualifications

● Experience developing hardware products with moving mechanisms, such as robots, factory automation equipment, mobility products, home appliances, medical devices, industrial equipment, drones, and precision devices

● Experience with brushless DC motors, servo motors, stepper motors, and actuator control

● Experience developing robotic arms, robotic hands, humanoids, dual-arm robots, or mobile robots

● Experience developing robotic systems using ROS / ROS 2, micro-ROS, DDS, and related technologies

● Experience with motion control using EtherCAT, CANopen, CiA 402, and related protocols

● Knowledge of real-time control, control cycle design, latency reduction, and jitter reduction

● Experience designing safety functions, fail-safe mechanisms, anomaly detection, and emergency stop systems

● Experience developing RTOS, Linux drivers, Linux kernel modules, and related software

● Experience with log analysis, test automation, and test tool development using Python or similar languages

● Ability to read technical documentation in English and communicate technically with overseas vendors in English

■ Good Reasons to Join

● Work at the cutting edge of AI and robotics, shaping real-world intelligent systems—not just theory

■ Work Location

Tokyo, Japan
 

Details will be provided during the meeting.

ソフトウェアエンジニア（プラットフォーム）ポジション概要

月間1億人以上が利用する大規模プラットフォームを支える、高可用性・高パフォーマンスなシステムの開発・運用を担当していただきます。

以下のいずれかの業務をご担当いただきます。

• バックオフィス業務を支えるシステムの開発・運用（フルスタックエンジニア）
• グループ各社のサービス間で利用されるID・プロフィール連携を担う認証プラットフォームの開発・改善・運用

組織のミッション

安定性・拡張性・セキュリティを兼ね備えた次世代システムを設計・実装し、多様なサービスを支えること。

主な業務内容

フロントエンド・バックエンド双方の技術を活用し、アプリケーション開発からバックエンドシステムの最適化まで幅広く担当します。

具体的には以下の業務を想定しています。

• バックオフィス向けアプリケーションの開発・運用
• A/Bテスト効率化のためのシステム開発
• サーバーサイドアプリケーションの設計・実装（Kotlin、Javaなど）
• フロントエンド開発（React、TypeScriptなど）
• クラウド環境でのシステム構築・運用
• CI/CDパイプラインの構築・改善
• REST API設計・開発
• システムのパフォーマンス改善・セキュリティ対策
• アジャイル開発チームとの連携
• 認証プラットフォームの拡張・改善

※変更の範囲：会社の定める業務

求める人物像

• 技術への探究心があり、新しい技術を積極的に学べる方
• チームワークを重視し、円滑なコミュニケーションが取れる方
• 問題解決能力が高く、論理的に考えられる方
• プロダクト・システム品質向上に主体的に取り組める方

必須スキル

バックエンド

• サーバーサイド開発経験（3年以上）
• Java、Kotlin、C、C++、Scalaのいずれかの開発経験
• Spring / Spring Bootを利用した開発経験

フロントエンド

• React、Vue.js、TypeScriptの開発経験

その他

• クラウド環境での開発経験
• CI/CDの構築・運用経験
• REST API設計・開発経験
• Gitを利用したバージョン管理経験
• 日本語能力（N2以上）

歓迎スキル

• Kubernetes、Docker
• 3層アーキテクチャ
• セキュリティ設計・脆弱性対応
• Scrum・Kanbanなどのアジャイル開発経験
• OAuth・SSOなどの認証技術
• 大規模トラフィック向けフロントエンド開発経験
• ローカライズ対応経験
• ビジネスレベルの英語力

雇用形態

正社員（試用期間3か月）

勤務地

東京都（ハイブリッド勤務）

勤務時間

• フレックスタイム制（コアタイムなし）
• 標準労働時間：7時間45分
• 育児・介護による短時間勤務制度あり

休日・休暇

• 完全週休2日制
• 祝日
• 年末年始休暇
• 年次有給休暇
• 特別休暇

福利厚生

• 各種社会保険完備
• 通勤手当
• リモートワーク手当
• 確定拠出年金制度
• 健康診断
• 社内研修・語学研修
• キャリア開発支援制度

Cloud Infrastructure Engineer

About the Company

A rapidly growing FinTech company in Japan is building innovative digital financial services that make investing and asset management more accessible through mobile-first technology.

The company is expanding its engineering organization and looking for talented engineers who are passionate about designing secure, scalable cloud infrastructure and creating products that have a meaningful impact on users' daily lives.

Job Description

The engineering organization is expanding its global team to build the next generation of cloud-based financial services.

As a Cloud Infrastructure Engineer, you will collaborate closely with software engineers, security engineers, QA engineers, and product teams to design, build, and operate highly available cloud infrastructure supporting business-critical applications.

This role provides an opportunity to become a key member of a growing engineering organization and contribute to building modern cloud platforms from the ground up.

Please note: This position is open to candidates currently residing in Japan.

Highlights of the Opportunity

• Build and improve a growing engineering organization and cloud environment
• Work on large-scale infrastructure supporting millions of users
• Collaborate with talented engineers across different teams
• Influence architecture and technical decisions
• Gain experience with modern cloud technologies in the fintech industry
• Flexible hybrid working environment

Responsibilities

• Design and build robust, scalable, and highly available cloud infrastructure
• Develop infrastructure that enables smooth maintenance, patching, and upgrades with minimal downtime
• Design AWS infrastructure with regional-level fault tolerance
• Collaborate with security teams to build secure infrastructure
• Automate AWS deployments to enable faster delivery of cloud services
• Create self-service solutions that allow developers to easily provision AWS resources
• Improve infrastructure reliability, scalability, and operational efficiency

Required Qualifications

• 5+ years of experience designing and building AWS-based infrastructure solutions
• Experience managing production infrastructure for high-traffic and business-critical systems
• Strong understanding of cloud security best practices and compliance standards
• Experience with production incident management and cross-functional collaboration
• Hands-on experience with AWS Compute, Storage, and Analytics services
• Experience with Infrastructure as Code tools such as Terraform
• Experience with Linux system administration
• Experience with cloud monitoring, detection, and response
• Experience with cloud infrastructure patching and upgrades
• Excellent written, verbal, and interpersonal communication skills
• Business-level English or Japanese (Native Japanese or JLPT N1 equivalent)

Preferred Qualifications

• Experience maintaining 200+ servers or containers in a production cloud environment
• Experience with disaster recovery planning and improving RTO/RPO
• Experience with other cloud platforms such as Google Cloud Platform
• Experience with cloud performance tuning and cost optimization
• Experience using or contributing to open-source tools
• Experience publishing technical articles, blogs, or papers
• Experience managing IT compliance and security risks
• Experience designing and building infrastructure in financial services or regulated industries
• Experience operating in-house products and services

Working Conditions

Employment Status

• Full-time

Location

• Japan (Hybrid work style: Remote + Office)

Working Hours

• Super Flex Time (No Core Hours)
• Standard working hours: 9:00 AM – 5:45 PM (7 hours 45 minutes + 1-hour break)

Holidays

• Saturdays, Sundays, and Japanese National Holidays
• Summer Leave
• Year-end and New Year Holidays
• Annual Paid Leave

Salary & Benefits

Salary

• Annual salary based on skills, experience, and performance
• Annual salary review
• Overtime allowance
• Transportation expenses
• Work-style support allowance

Benefits

• Health Insurance
• Employee Pension
• Employment Insurance
• Workers' Compensation Insurance
• 401(k) Retirement Plan