Founding Engineer (Node.js / Python)

We are working with an

• *early-stage European tech startup**

building a

• *high-impact B2B software product**

with strong technical ambitions and a long-term vision.

The company is now looking for its

• *Founding Engineer**

, someone who wants to

• *build the technical foundations from scratch**

, shape engineering culture, and grow into a

• *CTO role over time**

.

This is a unique opportunity for an experienced backend engineer who wants to

• *move from execution to ownership**

.

• *Responsibilities :
• Design and build the
• *backend architecture from the ground up
• Develop core product features in
• *Node.js or Python
• Define
• *engineering standards, tooling, and infrastructure
• Set up
• *deployment pipelines and production environments
• Make
• *long-term architectural decisions
• Participate in
• *product and technical strategy
• Help build the
• *future engineering team
• *Tech direction (Exact stack still flexible — you will help define it ) :
• Backend:
• *Node.js or Python
• API-first architecture
• Cloud infrastructure
• Modern development practices
• Scalable SaaS architecture
• *Profile :
• 5–10+ years of backend engineering experience
• Strong experience with
• *Node.js and/or Python
• Experience building
• *products from scratch or early-stage systems
• Comfortable making
• *architecture decisions independently
• Interest in
• *startup environments
• Leadership potential and
• *CTO ambition
• The role is
• *fully English-speaking, so fluency in English is required
• *Why join?
• Founding engineer role with real ownership
• Opportunity to
• *build the tech stack from zero
• Direct collaboration with founders
• Clear
• *evolution toward CTO
• Strong product vision and long-term impact
• Small, fast-moving environment
• On-site role based in the Yvelines (100% in-office) | salary around €65,000