Our tiny team owns everything from React UIs to LLM fine-tuning. With funding secured and customer pilots under way, we’re looking for a versatile Full-Stack Engineer to accelerate product delivery and help layer advanced AI (LLMs, RAG, semantic search) into the experience.
Tech Stack
- Frontend: React (TypeScript, Vite, Tailwind)
- Backend: Python (FastAPI) & micro-services in Go/Rust
- AI / Search: OpenAI, Ollama / local LLMs, RAG, vector DB (Weaviate)
- Data: Firestore, Cloud Storage
- Infra / Ops: Docker (Podman OK), Cloud Run, Cloud Logging, GitHub Actions CI/CD
- Auth & Realtime: Firebase Auth, Firestore streams
- Mobile (roadmap): Native Swift/Kotlin via shared REST/GraphQL
- Observability: OpenTelemetry, Sentry
Responsibilities
- Build end-to-end features: schema → API → React UI, shipping to prod weekly.
- Integrate LLM-based workflows (chatbot, inquiry classification, content summarisation) using RAG and semantic search.
- Tune performance: Firestore query design, Cloud Run cold-start mitigation, bundle size optimisation.
- Strengthen CI/CD and IaC (Terraform modules, environment secrets).
- Mentor future hires; uphold code quality through reviews, tests, docs.
- Rotate across product surface areas—one sprint on buyer dashboard, the next on AI-powered search, etc.
Requirements
- Have 2-3 yrs experience delivering production web apps.
- Are fluent in React and one or more of Python, Go, or Rust—and eager to learn the rest.
- Know your way around Docker, cloud-native patterns, and observability basics.
- Can reason about NoSQL data models, indexing, and trade-offs.
- Have tinkered with LLMs/RAG/semantic search (or are hungry to dive in fast).
- Enjoy small-team velocity, imperfect specs, and wearing multiple hats.
Nice to haves
While not specifically required, tell us if you have any of the following.
- Japanese ability
- Google Cloud experience (IAM, Cloud Run, Pub/Sub).
- Firebase Auth / Firestore security rules proficiency.
- Marketplace, payments, or logistics domain exposure.
- Mobile app or React Native experience.
- OSS contributions or tech blog posts we can read.
Compensation
¥10,000,000 ~ ¥15,000,000 annually.
Stock options available (negotiable)
