【Senior Software Engineer】SaaS/累計89億円以上資金調達
株式会社ミツモア
給与：700万円〜1100万円
雇用形態：正社員
勤務地：東京都
仕事内容
About the position
・We’re looking for a Senior Software Engineer who is passionate about building reliable, scalable, and maintainable systems—from backend business logic to frontend user experiences.
・You’ll work primarily with TypeScript, with React on the frontend and Nest.js/Prisma on the backend. You’ll collaborate closely with both engineers and non-engineers (product, design, biz/ops) to ship features that power the core of our product for some of Japan’s largest enterprise customers.
You’ll have the opportunity to:
・Design and deliver features end-to-end across the stack (frontend, backend, architecture)
・Take ownership of technically challenging projects, such as algorithm optimization, complex data modeling, or new platform integrations
・Shape and evolve our core backend and data persistence layers
・Drive improvements in system reliability, performance, and maintainability
・Mentor other engineers and champion high standards in code quality and architecture
・Contribute to key open source projects and upstream dependencies as part of your normal workflow
・We value engineers who care deeply about technical quality, end-user experience, and long-term stability—not just shipping tickets fast.
Our Tech Stack
Not exhaustive, but the most important are:
・TypeScript everywhere.
・NodeJS.
・React.
・MongoDB.
・AWS (Specifically ECS, CloudFront, S3, SQS, Lambda)
・Vercel.
・Redis.
【プロダクト本部の特徴】
弊社には優秀なメンバーが揃っており、お互いに成長しあえる環境です。
・CTO経験者が5名以上も在籍。加えて、ヤフー、グリー、SmartNews、DMM、楽天、Dely、freee出身の優秀なエンジニアが集結。
・アメリカ、カナダ、中国、韓国、イギリス、フランス、ドイツ、ベルギー、ポーランド、リトアニア、ブラジル、シンガポール、フィリピンなど12カ国以上のエンジニアが在籍し、多角的な視点から組織が運営されています。
また、弊社の全てのエンジニアはGH Copilotの利用が可能です。
応募資格
・7+ years of professional software engineering experience
・Significant experience with TypeScript
・2+ years of hands-on work with React (or a similar modern frontend framework)
・Strong understanding of backend frameworks, database modeling (SQL/Prisma), and asynchronous app architecture
・Proficiency collaborating across functions (product, design, operations, and stakeholders)
・Track record of delivering production systems with an emphasis on reliability, testability, and maintainability
・Familiarity with modern development workflows: Git, PR reviews, CI/CD, and automated testing