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Open nowPosted 975 days ago

Backend Engineer

PayPay Card36 open roles

Where
Hybrid
Work mode
Hybrid
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Your applicationOpen nowBackend EngineerPayPay Card · Hybrid

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The clock on this job

Early applications get read.

12.1% of postings close within 7 days. Measured by our own scanner across the market. PayPay Card postings stay open a median of 20 days.

Share of postings closed within
  1. 2.1%1 day
  2. 4.5%3 days
  3. 12.1%7 days
  4. 19.1%14 days
  5. 35.6%30 days
  6. 52.7%60 days
This job: posted 975 days ago

PayPay Card median: 20 days open

The posting

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 75 million users since its launch (as of August 2026).

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 backend engineers to build, or rebuild, rock solid services 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 and fix the behind-the-scenes to power a top-notch user experience. 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.

私たちは、スケーラビリティ（拡張性）とメンテナビリティ（保守性）に徹底的にこだわり、極めて堅牢なサービスを構築、あるいは再構築していただけるバックエンドエンジニアを募集しています。

PayPayカードは、これまでにない最高のユーザー決済体験を提供することを目指し、次の2つのアプローチからクレジットカード業界に革命を起こそうとしています。

  • クレジットカード体験を次のレベルへと進化させる：プロダクトの体験向上や機能拡張のために、数多くの開発ロードマップが控えています。また、PayPayグループの一員として、「PayPayエコシステム」とのシームレスな統合・連携も強力に推進しています。
  • システムアーキテクチャの再構築 ：最高のユーザー体験を裏側から支えるために、現在のシステム構造を再評価し、根本から最適化（刷新）したいと考えています。解決すべき技術的難題は非常に多いですが、私たちは小手先の修正ではなく、アーキテクチャとして「あるべき姿」を愚直に実現することを目指しています。

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。

Main Responsibilities / 具体的な業務内容

  • Support the design, implementation and delivery of large scale, and complex, systems, while collaborating with product managers, frontend engineers or other team members.
  • Understand how to leverage infrastructure to solve large scale problems.
  • Contribute to the team by sharing knowledge, participating in code reviews and providing feedback to uphold and ensure best practices.
  • Triage, debug and resolve product issues or other incoming troubles inquiries
  • Adopt problem solving as a way of life – always go to the root cause! Support the code you write in production.
  • プロダクトマネージャーやフロントエンドエンジニア、他チームのメンバーと連携した、大規模かつ複雑なシステムの設計・実装・デリバリーの推進
  • 大規模な課題を解決するために、インフラ基盤をどのように活用・レバレッジすべきかの検証と実践
  • ナレッジ共有、コードレビュー、フィードバックを通じたチームへの貢献、およびベストプラクティスの維持・浸透
  • プロダクトにおける不具合や外部からの問い合わせトラブルに対する、トリアージ、デバッグ、および原因究明と解決
  • 問題解決を自らの「コアマインド」とし、常に根本原因を追究する姿勢の体現、および本番環境（プロダクト）にデプロイした自作コードの継続的な保守・サポート

Tech Stack

We currently work with

  • Back-end services:
  • Main implementations are in Spring Boot, with a mix of Java 11/Spring Boot 2 and Java 17/Spring Boot 3.
  • Some legacy systems are written in Java EE.
  • Testing is done with JUnit and Mockito
  • Deployment relies on AWS ECS
  • CI/CD is handled by AWS CodePipeline
  • Infrastructure
  • All our services run in AWS
  • Infrastructure is managed by AWS CloudFormation
  • AWS CloudWatch is used for observability
  • Coding environment: GitHub, IntelliJ, Gradle
  • 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。

  • バックエンドサービス：
  • メイン実装：Spring Boot（Java 11 / Spring Boot 2、および Java 17 / Spring Boot 3 の混在）
  • 一部のレガシーシステム：Java EE
  • テスト：JUnit, Mockito
  • インフラ・デプロイ：AWS ECS / Docker
  • CI/CD：AWS CodePipeline
  • インフラ・共通基盤
  • クラウド環境：すべてのサービスを AWS 上で構築・運用
  • インフラ管理：AWS CloudFormation
  • オブザーバビリティ：AWS CloudWatch
  • 開発ツール： GitHub, IntelliJ, Gradle
  • プロジェクト管理・ドキュメント： Jira, Miro, Confluence
  • 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

  • Skills in OOP language such as C# or other JVM language, such as Scala are welcome
  • Experience with RDBMS, NoSQL databases along with distributed cache.
  • Strong fundamentals in data structures, algorithms and object oriented programming.
  • In-depth understanding of concurrency and distributed computing.
  • Experience implementing platform components such as RESTful APIs, Pub/Sub Systems, and Database Clients.
  • Experience with microservices and event-driven architectures.
  • Experience designing high traffic systems.
  • Degree in Computer Engineering or Computer Science or 3+ years equivalent experience in SaaS platform development.
  • Business level proficiency in English or Japanese
  • C#などのオブジェクト指向プログラミング言語、またはScalaなどのその他のJVM言語のスキルがあれば歓迎
  • RDBMS、NoSQLデータベース、および分散キャッシュの経験
  • データ構造、アルゴリズム、およびオブジェクト指向プログラミングに関する強固な基礎知識
  • 並行処理および分散コンピューティングに関する深い理解
  • RESTful API、Pub/Subシステム、および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
  • マイクロサービスおよびイベント駆動型アーキテクチャの経験
  • 高トラフィックシステムの設計経験
  • コンピュータエンジニアリングまたはコンピュータサイエンスの学位、あるいはSaaSプラットフォーム開発における3年以上の同等実務経験
  • 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

  • Domain-driven development knowledge
  • Java/Spring Boot experience
  • gRPC and Kafka development experience
  • Experience in a multicultural environment
  • Stakeholder management is welcomed
  • ドメイン駆動設計（DDD）に関する知識
  • JavaおよびSpring Bootの経験
  • gRPCおよびKafkaの開発経験
  • 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

Other Information

  • PayPay Inside-Out (Corporate Blog) JP ENG
  • Recruiting FACTBOOK for PayPay Card JP
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