Lead Full Stack Developer

Join our team as a Lead Full Stack Developer, where you'll have the opportunity to lead and shape the technical direction of our platform while still being hands-on with coding. You'll be responsible for building and maintaining a robust backend and cloud infrastructure, as well as translating commercial and product priorities into technical work. This is a hybrid position based in Central Paris, with 1-2 days per week on-site.

• Implement, maintain, and continuously improve a robust, scalable, high-performance backend and cloud infrastructure.
• Translate commercial and product priorities from the leadership team and internal stakeholders into technical work, and give an honest read on cost, risk, and sequencing before anything is committed.
• Define what the team needs, run technical interviews, make the call on candidates, and own whether people ramp up well.

**The position**

You report to the CTO (Aaron) and work alongside two senior software engineers (Sylvain and Tim). You are the technical authority on the platform and the day-to-day lead for the team.

We have no dedicated ops team, so running your own services in production is part of the job. There is no on-call rotation.

This is a hybrid position based in Central Paris, 1-2 days per week on site. The alignment part of this role works better in person, and the people you will be translating for are here.

**What you bring**

• Professional fluency in English (C1/C2).

• Product judgment. You can tell the difference between a request and a requirement, and you have opinions about what should be built that you are willing to defend and to drop.

• Senior-level experience building and operating back-end systems in critical production environments, including a period as tech lead, lead developer, or the de facto technical owner of a small team.

• Working frontend experience. You do not need to be a frontend specialist, but you need to be able to ship a feature end to end without waiting for someone else, and to review frontend work credibly.

• Ability to explain technical subjects clearly to non-technical audiences

• Advanced programming skills in Python 3.12+.

• Real experience with GCP or an equivalent (AWS, Azure), or a clear willingness to get there fast.

• Analytical and critical thinking, the ability to take responsibility for quality from prototype to production, and the ability to say no.

• Fluency with AI-assisted coding tools (Claude Code and similar), including the ability to critically evaluate AI-generated code and continuously improve internal procedures.

• Comfort with a die and retry philosophy: fail fast in development, rigour in production.

• A genuine interest in producing battle-tested, production-grade code within a distributed environment, and in staying current on software engineering and security.

• Entrepreneurial mindset: you find solutions, take initiative, and accept that at our size responsibilities do not come in neat boxes.

**Bonus points**

• Familiarity with IoT, MQTT, or building automation (HVAC).

• Networking knowledge: routers, VLANs.

• Ability to challenge existing architectures, including ones that have worked for years.

• True fullstack experience (from prototype to production, any framework, any language) and the ability to maintain a production fleet.

• Infrastructure as code with Terraform.

You are curious and willing to learn. So are we. Even if you do not tick every box, we encourage you to apply.