B251. FullStack Engineer (White Label / User Platform) <Full Remote / Full Flex> [AI x Fintech with over 65 billion JPY in cumulative funding]English summary from Japanese

株式会社UPSIDER

✓ Detailed

Salary

740万円〜 1,200万円

Role summaryEnglish summary from Japanese

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

Join UPSIDER's new business venture as a FullStack Engineer, contributing to the development of an innovative AI-powered financial service. You will be instrumental in shaping and growing a product from its initial stages, focusing on rapid value delivery and high quality.

Must-haves

Experience in technical decision-making
Experience in specification definition, requirements definition, and design
Experience with code reviews
Practical experience in Agentic Coding (e.g., Claude Code, Devin)

Nice-to-haves

Design and implementation considering extensibility, robustness, scalability, and testability
Experience operating web services and applications
Experience leading or managing teams, projects, or technical decision-making
Development experience in finance or accounting system domains
Experience with complex system requirements like payment processing

Tech stack

TypeScriptReact

About the Company