Lead Full Stack Developer
Confirmed on the employer's own hiring board on Oct 8, 2026. First seen by Alion on Sep 23, 2026.
Join our team as a Lead Full Stack Developer, where you'll have the opportunity to lead and set direction while staying 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 hybrid position is based in Central Paris, with 1-2 days per week on-site.
Missions
- 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.
Profil recherché
**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 (yet)**, 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)**.
* **Advanced programming skills in Python 3.12+, and JavaScript (or TypeScript)**.
* **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 front-end experience**. You do not need to be a front-end specialist, but you need to be able **to ship a feature end-to-end without waiting for someone else**, and to review front-end work credibly.
* Ability **to explain and trivialize technical subjects** clearly to non-technical audiences
* **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, rigor 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**
* **High bonus: familiarity with IoT, MQTT, or building automation (HVAC)**.
* **High bonus: networking knowledge**: routers, VLANs. You will be asked to handle those.
* **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.