Change the "Norm" of Japanese Finance with Your Own Designs. Seeking Founding Members for System Renewal Project Supporting Japan's First 15 Million Accounts.English summary from Japanese

株式会社400F

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Salary

600万円〜 1,300万円

Role summaryEnglish summary from Japanese

English summary for screening — check the original posting before applying.

Join a system renewal project for SBI Securities, Japan's largest financial institution, to modernize their platform. You will bring modern web technologies and AI development culture from 400F to rebuild systems supporting 15 million accounts.

Must-haves

3+ years of development experience at a web-focused company
Must reside in or be able to relocate to the Tokyo metropolitan area to allow for at least weekly on-site work
Backend focus: 3+ years of development experience with Go, Ruby, Python, Rust, Perl, Scala, or Java
Frontend focus: 2+ years of development experience with TypeScript
Frontend focus: Development experience with React, Vue.js, or similar frameworks

Nice-to-haves

University degree in Computer Science or related field
Experience with API design and development
Experience using GraphQL or gRPC in a professional setting
Experience with AWS or GCP
Experience using AI coding tools (e.g., ClaudeCode, GitHub Copilot)

Tech stack

About the Company

株式会社400F

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Posted8/26/2026

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