Full Stack Engineer
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We are hiring a Full Stack Developer
To apply, please send your CV and motivation letter to
Want to make an application Make sure your CV is up to date, then read the following job specs carefully before applying.
About the Company
Helion Research is a market research agency specialised in Mystery Shopping & Customer Experience Research, active in over 90 countries for multinational retailers, manufacturers and service providers. We are bringing more of our technology development in-house — and looking for a full-stack developer to help build it.
About the Role
You will join a small internal development team and work closely with our technical lead, management and business users. Because the team is small, you get real responsibility early: your own components, direct contact with the people who use what you build, and a say in technical decisions. You won't be expected to figure everything out alone.
Responsibilities
- Build features across our TypeScript stack: React frontends (Vite, TailwindCSS, TanStack Query) and typed backends (Hono, tRPC, Drizzle on PostgreSQL)
- Connect those applications to Helion systems, databases and external APIs
- Build AI features into the product, such as LLM-supported grading and validation of research data
- Help make AI-generated output reliable enough for production use
- Take prototypes to production: testing (Vitest, Playwright), documentation, code quality
- Try different technical approaches and measure what works
Qualifications
1 – 4 yrs experience — ideally
Required Skills
- Good software-development fundamentals
- Experience with full-stack, backend or web application development
- Solid TypeScript — used across the entire stack
- React
- Databases and SQL (we run on PostgreSQL)
- Building or integrating APIs
- Git / GitHub
- Able to read existing code and build reliable new functionality on top of it
- Genuine interest in building with LLMs — work, side projects, studies or open source
- Basic understanding of LLM applications: inference cost/time, and how RAG fits together
- Comfortable working primarily from our Antwerp office
Preferred xlxgzvr Skills
- Bun, Vite, TailwindCSS, Hono, tRPC, Drizzle, Zod, TanStack Query
- Cloudflare Workers or other serverless platforms
- Testing with Vitest, Playwright or similar
- Docker
- Authentication, permissions & application security
- PDF or image processing
Pay range and compensation package
Salary based on experience + extra-legal benefits
Office in city centre of Antwerp
2 days work from home
Full-time, permanent position, Antwerp, Belgium
Equal Opportunity Statement
We are committed to diversity and inclusivity in our hiring practices.
Apply: send CV + motivation to
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