Cloud Infrastructure 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:

Architect and build a robust, scalable and stable infrastructure Architect and build Infrastructure that is easily maintainable during patching and upgrades without

downtime Architect and build Infrastructure with AWS regional level failure tolerance Work together with our Security Engineers to provision a secure Infrastructure Automations for AWS Deployments to ensure fast delivery of Cloud Services to our developers Provide through Automations means for developers to easily deploy resources on AWS

堅牢でスケーラブルかつ安定したインフラストラクチャの設計と構築 パッチ適用やアップグレード時にダウンタイムが発生せず、容易に保守可能なインフラストラクチャの設計と

構築 AWSのリージョナルレベルの耐障害性を備えたインフラストラクチャの設計と構築 セキュリティエンジニアと協力して、安全なインフラストラクチャを提供する AWSへのデプロイを自動化し、開発者にクラウドサービスを迅速に提供する 開発者がAWSにリソースを簡単にデプロイできるよう、自動化手段を提供する

Qualifications / 必要なスキル・経験 :

5+ years of technical experience in AWS based Infrastructure solution design and build Experience in production level Infrastructure change management and releases for High traffic &

business-critical systems Good understanding of Cloud security best practices and payment industry compliance standards Experience in production incident management and cross team collaboration Extensive technical hands-on experience of Computing, Storage and Analytical Services on

Cloud(AWS) Experience with IAC tools in AWS such as Terraform etc. Experience with Linux Internals and System Administration Experience with Cloud Services Monitoring, Detection and Response Experience in Cloud Infrastructure Service patching and upgrades Have excellent written, verbal and interpersonal communication skills Business level in either English or Japanese (Native Japanese speaker or JLPT N1 equivalent)

5年以上のAWSを利用したプロダクトのインフラソリューション設計・構築の経験 高トラフィックかつビジネスクリティカルなシステムの本番レベルのインフラ変更管理、およびリリースの経

験 クラウドセキュリティのベストプラクティスと金融業界のコンプライアンス基準をよく理解していること 本番インシデント管理、およびチーム間コラボレーションの経験 AWS上のコンピューティング、ストレージ、分析サービスに関する豊富な技術的ハンズオン経験 TerraformなどのAWSにおけるIACツールの使用経験 Linuxの内部およびシステム管理の経験 クラウドサービスの監視、検知、対応経験 クラウドインフラサービスのパッチ適用とアップグレード経験 文書、口頭、対人コミュニケーションに優れたスキルを持っていること 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:

Has maintained over 200 servers/containers in a production, customer facing cloud environment Experience in Disaster recovery for cloud systems and improvements for RTO and RPO Experience with other cloud service providers (e.g Google Cloud) Experience in Cloud Services Performance Tuning, cost controls and management Experience using and contributing to Open Source tools Published papers / blogs / articles - Experience in managing IT compliance and security risk Experience in working for infrastructure design and build in securities, finance, or similar

industries Experience in in-house service operations

本番環境、顧客向けクラウド環境で200台以上のサーバーを保守した経験 クラウドシステムのディザスターリカバリー、RTOとRPOの改善経験 AWS以外のクラウドサービスプロバイダー（GCPなど）の利用経験 クラウドサービスのパフォーマンスチューニング、コスト管理、マネジメント経験 オープンしたツールの利用、貢献経験 論文/ブログ/記事の発表、ITコンプライアンスとセキュリティリスクの管理経験 証券・金融業界でのインフラ設計、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

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 Special Incentive once a year *Based on company performance and individual contribution and

evaluation 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） 会社業績および個人貢献度により賞与支給（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）

Full Stack Engineer

#1 on ProductHunt. Over 10,000 AI agents generated worldwide within months of launch – that’s our voice AI agent platform Omakase.ai. The product has evolved with major updates including a voice+chat hybrid widget, a smarter recommendation engine, and Shopify integration. Monetization is live, and early ARR is tracking strongly. We’re confident in the trajectory for global impact — that’s why we’re hiring elite engineers to join us from Japan. Let’s scale a Japanese-born AI product globally! What We Do We’re revolutionizing sales with Omakase.ai – because chatbots just answer questions, but our Agentic Voice AI agents actually close sales. Our voice-powered sales agents behave like real sales reps – persuasive, helpful, and always on-brand. They provide live product recommendations during conversations, conversation analytics to understand customer behavior, and a smarter scraping engine that learns any website instantly with zero setup required. As a Full Stack Engineer You’ll dive into global AI product development during our zero-to-one phase. You’ll work directly with our CEO and core team from Japan while building for global markets, experiencing AI-driven development with rapid iteration from concept to release. This is your chance to shape the future of sales technology from the ground up in an international work environment that welcomes both Japanese and non-Japanese speakers. Your Typical Day With Us

Take full technical ownership of a key product domain (integration systems, data pipeline architecture, conversational AI engine, or client application layer)

Lead end-to-end full-stack development, from front-end interfaces to

backend services and data storage Make system architecture decisions designed to scale to millions of

concurrent users Provide technical leadership through expertise and execution, without

direct reports

What you'll Need

9+ years building production software systems 5+ years building scalable backend services in production environments with Go,

plus working knowledge of Ruby on Rails. Equivalent experience with other backend technologies (Python, C#, Node.js, etc.) will also be considered

3+ years building modern web applications with React or Vue Experience with distributed systems design and microservices architecture Global state management in complex frontend applications Production database optimization and query performance tuning CI/CD pipeline design and automated testing strategies Application monitoring, logging, and performance optimization Security implementation across authentication, authorization, and data protection Experience shipping features that measurably impacted business metrics

Technical Environment

Backend: Go microservices with Rails BFF layer Frontend: React with TypeScript Data: PostgreSQL with Redis caching Infrastructure: Cloud-native deployment with container orchestration Development: GitHub-based workflows with automated deployment

Preferred Experience

Server-side rendering or modern meta-frameworks (Remix, Next.js) Specific state management libraries (Jotai, Zustand, Recoil) Observability tools (application performance monitoring, distributed tracing) High-availability system operations and incident response Experience with AI-assisted development workflows and modern tooling (Cursor,

Windsurf, AI-enhanced IDEs) Startup work experience

What makes you stand out

Engineers who understand that chatbots suck and want to build something that

actually works Full-stack developers who can cross frontend/backend boundaries and

autonomously drive product growth Builders with curiosity and drive to immediately implement new AI/LLM

technologies into products Engineers who thrive on startup speed and can push beyond limits

Team & Culture

4-person technical team reporting directly to leadership "Always Be Launching" - rapid iteration with production focus Autonomous execution expected - minimal technical guidance provided Participate in incident response and system maintenance alongside founding

team, transitioning to structured on-call rotation as we grow Japanese conversational skills welcome for team collaboration

Interview Process

Application screening → HR interview → Technical interview → CEO interview → Panel interview → Offer

Now is the time to take your code to the world

We're going after the world now, not "someday." We're excited to create an incredible future with those who share our vibe.