Fullstack Engineer

Tokyo
Remote OK - Anywhere in Japan
Full-time
July 20, 2026

What you'll do

Build and own features across the stack, from database and API through to the interface users touch
Design and implement the API endpoints new product surfaces depend on
Implement frontend work coming from design, from small UI corrections through to full components and flows
Ship experiments and instrumentation on activation, conversion, and engagement flows, and iterate on what the data says
Work on generative AI product surfaces: prompt flows, generation pipelines, the places where model behavior meets UX

Development style

Small team (Growth Team), short path from idea to production
You work directly with designers, PMs, and analysts, without a ticket queue in between
Decisions get settled by shipping and measuring rather than by debate
A senior growth engineer on the team to review your work and learn from
Team communication is in English
On-site / Remote hybrid.

Tech stack

Frontend: React + TypeScript, Tailwind CSS
Backend: Node.js + TypeScript, GraphQL, RPC, PostgreSQL
Infrastructure: AWS, Docker
Experimentation / Analytics: Amplitude, Snowflake

Requirements

3–5+ years building and maintaining products used by real users
Shipped both frontend features and backend services or APIs in production
Able to design and implement well-structured API endpoints
Strong enough on the frontend to implement a design faithfully and catch quality issues before users do
Comfortable clarifying underspecified work yourself instead of waiting for a spec
Honest estimation, and early flagging when something is blocked or bigger than it looked
Basic SQL, enough to check that what you shipped did what you expected
Professional experience with B2C / consumer-facing products
English at business level

Nice to have

Hands-on experience running A/B tests or similar product experiments
Experience working closely with designers to implement UI
Experience with growth work, product iteration, or independent app development
Interest in anime, otaku culture, or creator communities
Interest in AI generation

Note:

If you've read this, please tell us your top 3 favorite anime at the end of your message.

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About Metanomaly

Metanomaly builds an AI-native image generation and sharing platform.

They are one of the largest AI image generation platforms by traffic and offer proprietary models that enable users to unleash their artistic potential and imagination when creating virtual characters.