Full Stack Engineer

Helion Market Research

Antwerpen, Belgium

6 days ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience required

1 year minimum

Working hours

Regular working hours

Job source

www.adzuna.be

Tech stack

Artificial Intelligence Application Integration Architecture User Authentication Software Quality Databases Web Development PostgreSQL Open Source Technology TypeScript Tailwind ReactJS Large Language Models

+8 more

Software Security Backend Webpack Playwright Cloudflare JestJS Serverless Computing Docker

Job 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

Requirements

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

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.