Applications: candidates may apply from outside Japan. Visa sponsorship: available. Japanese: Not required. English: Fluent. Japan Dev tags: Engineering, Web / Full-stack, NodeJS, React, Typescript, PostgreSQL, CSS, GraphQL.
What you'll do
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Build and own features across the stack, from database and API through to the interface users touch
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Design and implement the API endpoints new product surfaces depend on
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Implement frontend work coming from design, from small UI corrections through to full components and flows
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Ship experiments and instrumentation on activation, conversion, and engagement flows, and iterate on what the data says
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Work on generative AI product surfaces: prompt flows, generation pipelines, the places where model behavior meets UX
Development style
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Small team (Growth Team), short path from idea to production
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You work directly with designers, PMs, and analysts, without a ticket queue in between
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Decisions get settled by shipping and measuring rather than by debate
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A senior growth engineer on the team to review your work and learn from
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Team communication is in English
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On-site / Remote hybrid.
Tech stack
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Frontend: React + TypeScript, Tailwind CSS
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Backend: Node.js + TypeScript, GraphQL, RPC, PostgreSQL
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Infrastructure: AWS, Docker
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Experimentation / Analytics: Amplitude, Snowflake
Requirements
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3–5+ years building and maintaining products used by real users
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Shipped both frontend features and backend services or APIs in production
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Able to design and implement well-structured API endpoints
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Strong enough on the frontend to implement a design faithfully and catch quality issues before users do
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Comfortable clarifying underspecified work yourself instead of waiting for a spec
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Honest estimation, and early flagging when something is blocked or bigger than it looked
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Basic SQL, enough to check that what you shipped did what you expected
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Professional experience with B2C / consumer-facing products
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English at business level
Nice to have
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Hands-on experience running A/B tests or similar product experiments
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Experience working closely with designers to implement UI
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Experience with growth work, product iteration, or independent app development
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Interest in anime, otaku culture, or creator communities
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Interest in AI generation
Note:
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