Senior Full-stack Engineer

About DutyDeclared

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DutyDeclared is a UK customs declaration and trade-intelligence platform. We help customs brokers and traders navigate HMRC's Customs Declaration Service (CDS) without drowning in complexity — turning slow, error-prone import paperwork into fast, accurate filings. We're a small team doing hard, meaningful work, and we're building AI into the core of how the product thinks.

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Who We're Looking For

This role is as much about how you work as what you know. We want someone who:
- Takes ownership. You see something broken or missing, you fix it — you don't wait for a ticket or a nudge.
- Ships. You have a bias for getting things in front of users. You know the difference between done and perfect, and you choose done.
- Is genuinely curious about the domain. Customs and trade compliance isn't glamorous — but you find it interesting enough to care about getting it right, and it shows in your work.
- Keeps things simple. You reach for the simplest solution that works. You don't build infrastructure for problems you don't have yet.
- Has low ego. You hold your opinions confidently and push back when it matters — but you're not precious about being right. The best idea wins.
- Communicates directly. You say what you think. In a small team, clarity beats politeness.

If that sounds like you, here's the technical side.

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What You'll Build
- AI-powered features end-to-end: declaration pre-fill, document parsing/extraction, trade classification, and broker-copilot workflows.
- Reliable LLM pipelines using tool use, structured outputs, and multi-step agent patterns.
- TypeScript/Node.js backend services integrating with HMRC CDS APIs and our data models (PostgreSQL/Prisma).
- React/Next.js UIs built on our component design system.
- Evals and monitoring to track model behaviour and catch regressions in production.

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What We're Looking For

‍Must have
- 3–6 years full-stack experience, strong TypeScript across React and Node.js
- 1–2+ years building with LLM APIs in production — tool use, RAG, structured outputs, or agents
- Solid backend fundamentals: REST, relational databases, auth
- Ability to scope and ship features independently

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Nice to have
- Next.js, Prisma, or GCP
- Python for data-adjacent work
- Vector databases (pgvector, Pinecone, Weaviate)
- Experience in regulated domains — legal, finance, logistics, govtech
- LLM eval tooling (Braintrust, LangSmith, or custom)

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How We Hire
A light process: a short intro chat, a focused take-home (a small AI + full-stack build — we judge the outcome, not the hours), and a debrief with the team.

This is a fully remote role, UK timezone required. Sound like a fit? 

Send me your LinkedIn profile via DM.

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