Senior Backend Engineer: Data Pipelines & AI (TS/ClickHouse)

MentionLab; Brussel; Hybride; EUR 85 000 - 120 000; Plein temps

Avantages offerts par ce poste

Car / mobility budget

Insurance

Dynamic workplace

Autonomy

Résumé du poste

MentionLab, headquartered in Brussels with a global footprint, is hiring a Senior Backend Engineer to drive our data infrastructure. You’ll design pipelines, optimize analytics, and own key parts of the product from day one, working with TypeScript, SQL and Rust, in a hybrid Belgium-based setting.

You’ll collaborate across teams to deliver fast, reliable data platforms and APIs powering AI-driven insights for customers and partners.

Qualifications

• 5+ years of software engineering experience
• Strong data modelling, query optimisation and performance tuning
• Solid knowledge of TypeScript and SQL
• Comfortable across analytical and transactional databases
• Experience with AI-assisted development tools (Copilot, Cursor, Claude Code, or similar)

Responsabilités

• Own data architecture from ingestion pipelines to ClickHouse data models
• Design and optimise analytical queries and data models as volumes grow
• Build and maintain backend APIs that serve insights
• Keep pipelines reliable and performant in production
• Work mainly in TypeScript and SQL (with Rust) for performance-critical processing
• Raise engineering bar through code reviews and mentoring
• Wear multiple hats in a startup environment

Connaissances

5+ years experience

Data modelling

Query optimisation

TypeScript

SQL

AI-assisted tools

Outils

NestJS

PostgreSQL

Redis

ClickHouse

Rust

Knex

MikroORM

Description du poste

MentionLab, headquartered in Brussels with a global footprint, is hiring a Senior Backend Engineer to drive our data infrastructure. You’ll design pipelines, optimize analytics, and own key parts of the product from day one, working with TypeScript, SQL and Rust, in a hybrid Belgium-based setting.

You’ll collaborate across teams to deliver fast, reliable data platforms and APIs powering AI-driven insights for customers and partners.