Full Stack Engineer

About MentionLab

AI is becoming the front door to discovery. People now ask ChatGPT, Perplexity, and Gemini what to buy, who to trust, and where to go; and the brands those models surface are the ones that win. MentionLab is the analytics layer for this new world: we measure how AI talks about brands, media, and institutions, benchmark them against competitors, and turn that into actions that move real visibility.

We're a small team moving fast at the start of the biggest shift in discovery since search engines; already processing millions of data points monthly.

🎯 The Role

As a Full Stack Engineer, you'll ship features across our whole stack; APIs, interfaces, and data pipelines and the freedom to own frontend independently with React when a feature needs it.

We're a small team, so you'll own real parts of the product from idea to production - from day one, not after a year of ramp-up. You'll get genuine autonomy and the support to grow fast. You won't be left alone with the hard stuff.

🚀 What You'll Build

• Take features from problem to production: build the schema, write the API, ship the UI
• Build clean, reliable React interfaces and solid TypeScript/SQL backend logic
• Help maintain and improve our data pipelines
• Review code, share ideas, and help shape how we work
• Grow into bigger ownership as you (and the product) scale
• Wear multiple hats (because startup)

🛠️ The Stack

• TypeScript, React, SQL - and some Rust.
• NestJS with MikroORM and Knex (PostgreSQL).
• Redis for queues (BullMQ + custom for high throughput).
• Tailwind, Shadcn.

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It's a codebase we actually care about: typed strictly, reviewed properly, built to be maintained.

🔍 What We're Looking For

• 3+ years of software engineering experience
• Strong TypeScript and SQL
• Solid backend fundamentals - REST APIs, server-side logic, database design
• Experience building user interfaces with React
• You move comfortably between frontend and backend
• You work with AI-assisted dev tools (Cursor, Claude Code, Copilot, or similar)

What We Value

• Proactive mindset - spot issues, propose solutions, don't wait to be told
• Comfortable with code reviews and constructive feedback
• You care about code quality but know when to ship fast

Nice to Have

• NestJS, PostgreSQL, Redis
• ClickHouse or other analytical datastores
• Hosting / infra (Docker, Kubernetes)
• Data visualization
• Previous startup experience

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⚡ You'll Thrive Here If

You enjoy figuring things out and don't need hand-holding. You're comfortable with ambiguity and changing priorities. You like collaborating and sharing what you learn. You're excited about AI and how it's changing discovery - and you're AI-native: you don't just build AI products, you build with AI.

🌍 How We Work

Languages: French highly preferred. English working proficiency for documentation and some meetings.

Location: Belgium-based (Brussels - depending on the profile we're open to remote/partial remote). Permanent contract (CDI) — 38h/week.

🤘 What We Offer

• Fair package, plus car/mobility budget, meal & eco vouchers, and hospitalization insurance
• Real ownership and a chance to shape the product
• High autonomy - with guidance when you want or need it. You're not alone.
• A young, ambitious team building something new

📋 Interview Process

1. Quick online chat - 30 min

2. Deep-dive technical discussion (preferably on-site with Martin) - 1 hour

3. Management meeting - 30 min

🎯 We hire people, not roles. Excited but don't tick every box? Still write to us; this is a guide, not a checklist.

Interested? Send your CV to [email protected] (a GitHub or a code snippet optional but appreciated 🙂).