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# Full Stack Engineer

- **Company:** Helion Market Research
- **Location:** Antwerpen, Belgium (Remote available)
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Application Integration Architecture, User Authentication, Software Quality, Databases, Web Development, PostgreSQL, Open Source Technology, TypeScript, Tailwind, ReactJS, Large Language Models, Software Security, Backend, Webpack, Playwright, Cloudflare, JestJS, Serverless Computing, Docker
- **Published:** September 4, 2026
- **Apply:** https://www.adzuna.be/details/5868786645

## About the Role

* 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 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

## Description

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., * 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


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