We develop APIs, SDKs, web UIs that interact with Ethereum-based blockchain systems. You'll begin by working on our front-end and back-end development.
If you're eager to dive deeper into web3 areas such as smart contracts, subgraphs, or IPFS, you'll also have the opportunity to do so.
■ Required Skills and ExperienceOver 3 years of professional experience in full-stack web development with a focus on TypeScript for both front-end and back-end applications.
Strong experience with modern frameworks and libraries, including NestJS andProficiency in designing, writing, and executing automated unit, integration, and end-to-end tests using modern testing frameworks (e.g., Jest, Mocha, Cypress, Playwright).
Familiarity with advanced concepts such as dependency injection, modular architecture, server-side rendering (SSR), static site generation (SSG), API design, and state management.
Working knowledge of CI/CD pipelines, code quality tools, and best practices for maintainable, testable, and performant applications.Ability to communicate in business-level English.
■ Welcomed Skills and Experience
Experience with DevOps and cloud infrastructure (e.g. AWS, GCP or Azure). Experience with Kubernetes is a plus.
Proficiency in smart contract development on EVM blockchains
Ability to communicate in Japanese
■ Our Development Environment
Blockchain:
Ethereum, Polygon (in Solidity)
Frontend:
(TypeScript), CSR/SSR, REST, GraphQL
Backend:
(TypeScript), NestJS, The Graph
Infrastructure:
Kubernetes, Google Cloud Platform(GCP), Alchemy
IDE/AI for development:
Cursor, OpenHands or anything that can accelerate our productivity
Source control:
GitHub
CI/CD:
CircleCI
Design:
Figma
Communication:
Slack, Notion, Zoom, GitHub, JIRA
While this is our current tech stack, you are welcome to suggest and implement improvements where appropriate.
You can find some information about what we do technically at .
■ About Company Benefits
Statutory Benefits and Life Event Support
Full labor and social insurance (Workers' Accident Compensation, Employment, Health and Nursing Care, and Employees' Pension Insurance)
Kanto ITS Health Insurance
Nursing care leave system
Maternity and paternity leave system (A male employee has taken paternity leave for six months.)
Bereavement/Congratulatory Leave, Congratulations and Condolences allowance
Commuting and Housing
Flextime system
Transportation expenses provided
Workplace and Learning
Support for purchasing books
Support for attending events and seminars
Employee referral program
Recruiting
Subsidies for recruitment dinners
Welfare expenses (business meals expenses)
Weekends and Holidays
2 days off per week (Saturday and Sunday)
Japanese national holidays are off.
New Year holidays
Summer vacation leave
Paid leave (available from the first month of employment)
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