Senior Software Engineer

Recommand; Hasselt; Hybride; EUR 90 000 - 120 000; Plein temps

Résumé du poste

Recommand, based in Belgium, is seeking a senior software engineer to shape our core platform across API design, data models, back-end and infra. You’ll work on APIs, data models, integrations, workflows, event-driven systems, and multi-tenant architecture.

This is a core team role with hybrid or remote options; you’ll collaborate across frontend and backend, focusing on performance, reliability and open source contributions.

Qualifications

• Experience designing and shipping robust APIs and data models.
• Proven ability to integrate multiple systems and data sources.
• Strong back-end and infra focus with a platform mindset.

Responsabilités

• Shape the core platform across API design, data modeling and integrations.
• Build and maintain event-driven workflows for multi-tenant architecture.
• Collaborate across backend, frontend and infra to deliver scalable solutions.

Connaissances

APIs

Data modeling

Event-driven architecture

Multi-system integration

Platform mindset

UI/UX

AI-assisted development

Open source

Startup experience

Outils

Bun

Hono

TypeScript

OpenAPI

Zod

React 19

Vite

TailwindCSS

PostgreSQL

Drizzle ORM

Docker

Description du poste

About The Role
We\'re looking for a senior software engineer to join our core team. You\'ll work across the full stack of our platform - from API design and database modeling to frontend interfaces and integrations.

About The Role
We\'re looking for a senior software engineer to join our core team. You\'ll work across the full stack of our platform - from API design and database modeling to frontend interfaces and integrations.
Recommand is infrastructure, not a CRUD app. You\'ll work on APIs, data models, integrations, workflows, event-driven systems, and multi-tenant architecture. You\'ll connect systems, map data, handle edge cases, and deal with the realities of ERP integration and business document exchange.
This is a core team role. You\'ll shape the platform, not just build features on top of it.
What you\'ll work with

• Runtime: Bun
• Backend: Hono, TypeScript, OpenAPI + Zod
• Frontend: React 19, Vite, TailwindCSS
• Database: PostgreSQL with Drizzle ORM
• Infrastructure: Docker
• Monorepo: Bun workspaces

What we\'re looking for
You Should Be

• A systems thinker - comfortable with APIs, data models, event-driven architecture, and multi-system integration
• Full-stack with a platform mindset - you\'re strong in backend and infrastructure, but you also care about building great UI and UX
• Pragmatic - you build v1s, evolve architecture, and thrive with changing requirements
• Comfortable with ambiguity - this is an early-stage startup, not a feature factory
• Someone who has embraced AI-assisted development - you use AI tools daily and know how to leverage them effectively
• Passionate about open source - you care about building in the open and value extensibility

Strong Signals

• Built or maintained an API platform, SDK, or developer tool
• Integration-heavy product experience - connecting external systems, handling messy data
• Open-source contributor
• Experience with workflow engines, automation tooling, or event-driven systems
• ERP integration, fintech, or invoicing experience
• Startup experience - you\'ve built from zero

Must-haves

• Strong TypeScript / Node.js (or Bun)
• Solid database and API design skills
• Integration mindset - you enjoy connecting systems
• Based in Belgium, available for hybrid or remote work

Nice-to-haves

• React experience
• Peppol or e-invoicing knowledge
• Experience with B2B or supply chain systems
• Familiarity with Belgian/EU compliance landscape

What this is not

• Not a frontend-only role
• Not a pure DevOps/infra role
• Not a feature-building product engineering role
• Not a rigid enterprise environment

How we work

• Small, hands-on, technical team
• Hybrid or remote - based in Belgium, with presence at Corda Campus, Hasselt when needed
• AI-assisted development is the default, not the exception
• Open source core - we build in the open
• Full-time engagement (employee or contractor)