Senior Full-Stack Engineer (TypeScript · React · Node.js)

AirBill - Remote (Netherlands) · Full-time · Start ASAP

About AirBill

AirBill is building the agentic accounting company for EU entrepreneurs. We handle bookkeeping and tax filings for EU SME segment. Bank data flows in, transactions are processed and booked, and VAT returns, CIT returns, corporate fillings are filed directly with the relevant authorities. A network of accountants reviews and signs off on that work, so clients get the speed of software with the certainty of a professional.

Next, we want clients to be able to connect their own AI agents (Claude, ChatGPT) to AirBill via MCP, for example to find missing receipts in their inbox. The ledger and filings stay rock-solid at the core.

The role

We're looking for a senior, hands-on full-stack developer who wants real ownership. You'll take features from idea to production: design, build, test and ship. You'll also be someone the founders can test ideas against, and who pushes back when needed.

What you'll work on

- Product across our web app (React/Next.js) and mobile app (React Native)

- Backend services in Node.js/NestJS on Supabase/Postgres

- Integrations that matter: bank data (PSD2), Exact, Twinfield and Digipoort

- Reliable background jobs for transaction processing, reconciliation and filings

- Our MCP layer, so clients can connect their own AI agents to their administration

- Keeping security, data integrity and maintainability high while moving fast

What we're looking for

- Senior full-stack experience with strong TypeScript, React/Next.js and Node.js

- Comfortable working on React Native mobile apps

- Strong backend fundamentals: database design, authentication, API integrations and reliable background jobs

- You can own a feature end-to-end, from idea through implementation, testing and release, without constant direction

- Good product sense: you care about making things simple and useful, not just technically correct

- Pragmatic about architecture: you move quickly without compromising data integrity, security or maintainability

- You communicate clearly, challenge ideas and flag problems early

- You use AI coding tools effectively and take full responsibility for understanding and verifying the code they produce

Nice to have

- NestJS and Supabase/Postgres experience

- Startup experience

- Background in fintech, accounting or another domain where correctness really matters

- Dutch language skills

Ownership and sound judgment matter more to us than any single item on this list.

What we offer

- €80,000–€95,000 gross per year, excl. 8% holiday allowance

- Fully remote within the Netherlands

- Laptop of your choice and a personal budget for AI tools

- A small team where your work directly shapes the product and the company

- Short lines: you work directly with the founders

- A product entrepreneurs rely on for their finances and tax obligations

Practical

You're based in Europe and have the right to work here. We're unable to sponsor visas.

Our process

1. Intro call (30 min)

2. A conversation about something you built and owned end-to-end

3. A paid practical case or pairing session

4. Meeting the founders

How to apply

Send your profile or CV with a few lines about something you built and owned end-to-end. Tell us what it did, which trade-offs you made, and what you'd do differently now. GitHub or side projects are welcome but not required.