Senior Frontend Engineer

About PayPay Card PayPay Card Corporation was established in 2021 to provide users a FinTech service that is more accessible and convenient compared to previous credit cards and credit services, by integrating with the PayPay payment platform, which has surpassed 70 million users since its launch (as of July 2025). We are looking for people who are passionate about refining our products at an overwhelming speed that other companies cannot match, as well as professionals who are interested in promoting the spread of cashless payments in Japan and the use of these payments as a financial life platform. Let us work together to create new value for users. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation.

Job Description / 業務について We are looking for web frontend engineers to work on the PayPay Card mini-application, and other web frontend, with a laser focus on scalability and maintainability. PayPay Card aims at revolutionizing the credit card industry, making payment easier than ever, from two different angles:

Bring the credit card experience to the next level: we have many functionalities in the pipe to improve our product, not to mention the integration into the PayPay ecosystem as PayPay Card is part of the PayPay Group.

(Re-)architect our systems landscape: we want to reassess our frontend systems relevancy and update the architecture according to our product & technical roadmap. It is bundled with difficult design challenges to solve: we simply want to get it right.

As a fast-paced company leading the payments industry, we need our engineers to be versatile and enthusiastic to take on new challenges in order to stay at the forefront. Indeed, we strive for continuous improvement within our systems as well as outside our systems. Additionally, we value communication, to smoothly cooperate with other teams, and inclusivity, to efficiently navigate in a multicultural environment. PayPayカードのミニアプリおよびWebフロントエンド開発において、スケーラビリティとメンテナビリティを最重視して 取り組んでいただくフロントエンドエンジニアを募集しています。 PayPayカードは、以下の2つの側面からクレジットカード業界の変革を目指しています。 クレジットカード体験を次のレベルへと進化させる 当社では、プロダクトの継続的な進化のために数多くの機能開発を予定しています。また、PayPayカードは PayPayグループの一員として、PayPayエコシステムとの統合・連携も強化しています。 システムアーキテクチャの再構築 フロントエンドシステムの妥当性を再評価し、プロダクトおよび技術ロードマップに沿ってアーキテクチャを刷新しま

す。そこには難易度の高い設計上の課題が数多く存在しますが、私たちは妥協することなく、プロダクトとして「ある

べき姿」を追求したいと考えています。 業界をリードする圧倒的なスピード感の中で、常に最前線に立ち続けるために、エンジニアには領域にとらわれない

柔軟性と、新しい挑戦に意欲的に取り組む姿勢が求められます。私たちはシステムの内外を問わず、絶え間ない改

善を追求しています。また、他チームと円滑に連携するためのコミュニケーション力や、グローバルな環境で最大の

パフォーマンスを発揮するための多様性を重視しています。

Responsibilities / 具体的な業務内容

Work with Product Managers, Designers, and various tech teams to implement features. Improve the frontend architecture based on product and technical roadmap. Work to bring product and organization vision to life. Contribute to the team by sharing knowledge, participating in code reviews, and providing

feedback to uphold and ensure best practices. Improve the product’s long term technical quality. Triage, debug, and resolve product issues. 大規模かつ複雑なシステムの設計、および実装からデリバリーまでの主導・サポート プロダクトマネージャーやフロントエンドエンジニア、他チームのリード、非エンジニア（ビジネス側）を含む多

様なステークホルダーとの調整・マネジメント 既存インフラを最大限に活用・レバレッジした、大規模課題の解決 チームにおける技術・品質水準（クオリティスタンダード）の維持と、ゲートキーパーとしての役割の遂行 プロダクトにおける不具合や外部からの問い合わせに対する、トリアージ、デバッグ、および解決 チームメンバーへのメンタリング、およびチーム全体の開発品質の保護・担保

Tech Stack

We currently work with Frontend web application:

Main implementation is in Nuxt 3 (Vue.js 3, TypeScript) REST API with OpenAPI codegen TanStack Query and Zod are used for API handling and data validation Storybook is used for component visualization and UI testing Sentry and Google Analytics are used for error and product reporting CI/CD pipeline, including testing and deployment tasks, relies on GitHub Actions Deployment is static (AWS S3, CloudFront and Route53)

Coding environment: GitHub, GitHub Copilot, Visual Studio Code Documentation & Project management: Confluence, Miro, JIRA Communication: Slack, Zoom, Office 365

Please note that PayPay Card is challenging its current architecture, potentially introducing new technologies and/or deprecating existing ones. 現在は以下の技術を使用しています。 フロントエンドWebアプリケーション

メイン実装：Nuxt 3（Vue.js 3、TypeScript） REST API（OpenAPI codegen） API・データバリデーション： TanStack Query、Zod コンポーネント管理・UIテスト：Storybook エラー監視・分析：Sentry、Google Analytics CI/CD：GitHub Actions インフラ・デプロイ：AWS (S3, CloudFront, Route53) による静的ホスティング

開発ツール GitHub GitHub Copilot Visual Studio Code

プロジェクト管理・ドキュメント Confluence Miro

JIRA

コミュニケーション Slack Zoom Office 365

※ PayPayカードでは既存のアーキテクチャ刷新（リアーキテクト）に取り組んでいるため、プロダクトの成長に合わ せて新しい技術の積極的な導入や既存技術のリプレイスを柔軟に推進していきます。

Required Qualifications / 必要な経験/スキル

At least 7 years of industry experience developing secure web frontend applications in JavaScript and/or TypeScript.

At least 2 years of industry experience with VueJS (preferred) or React. Experience with designing frontend architecture. Experience with leading frontend project development. Software engineering best practices and computer science knowledge. Experience with building frontend hosting infrastructure and deployment pipelines. English business proficiency JavaScriptまたはTypeScriptを用いた、セキュアなWebフロントエンドアプリケーションの開発実務経験（7

年以上） Vue.js（推奨）またはReactを用いた開発実務経験（2年以上） フロントエンドアーキテクチャの設計経験 フロントエンドプロジェクトにおける開発のリード経験 ソフトウェアエンジニアリングのベストプラクティス、およびコンピュータサイエンスに関する基礎知識 フロントエンドのホスティング基盤およびデプロイパイプラインの構築経験 ビジネスレベルの日本語または英語力

Preferred Qualifications / あると望ましい経験/スキル

Experience with launching a frontend product. Experience with frontend performance monitoring and optimization. Experience with designing and implementing server side RESTful APIs. Experience in Domain Driven Development Experience in a multicultural environment. Stakeholder management is welcomed. Japanese conversational proficiency is a plus. フロントエンドプロダクトの新規立ち上げ経験 フロントエンドのパフォーマンス監視および最適化の実務経験 サーバーサイドにおけるRESTful APIの設計および実装経験 ドメイン駆動設計（DDD）を用いた開発経験 グローバル環境での業務経験 他部門とのステークホルダーマネジメントの経験

Working Conditions

Employment Status

Full Time

Office Location

Hybrid Workstyle (flexible working style including Remote and office)

※ You will be expected to work both in the office and remotely, in alignment with organizational guidelines and team objectives.

LIFE in JAPAN FACTBOOK

Work Hours

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

Holidays

Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days

Paid leave

Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire)

Personal leave (5 days each year, granted proportionally according to the month of employment) ＊PayPay Group's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc.

Salary

Annual salary paid in 12 installments (monthly) Reviewed once a year Overtime allowance, Late overtime allowance, Commuting and transportation expenses

Benefits

Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)

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.