Senior Backend & Cloud Engineer at Vizzia

🎯 CONTEXT 250+ local authorities already rely on Vizzia to keep their streets cleaner and safer. By the end of 2026, that number will be 450. Behind every camera in the field sits a cloud and IoT stack that has to keep up — FleetAPI, device provisioning, OpenVPN multi-shard, the routers that keep our cameras online. Doubling the fleet doesn't mean doubling the manual work behind it. It means rebuilding the foundations so it scales on its own. We're looking for the cloud and backend referent of this squad. You'll pair with Wilfried (Tech Lead) on architecture, work alongside Timon (PM) on what gets shipped, and take full ownership of the cloud foundations - so the next 200 cities we onboard reinforce what we've built, rather than stretch it thin. 🛠️WHAT YOU'LL DO 1. Take ownership of the IoT cloud perimeter - Get hands-on with FleetAPI, AWS Step Functions provisioning, RMS, and the Retool layer - operating 50% of the perimeter autonomously within three months, 100% within six. - Document the stack as you go. The goal isn't a wiki - it's that the team's knowledge becomes shared infrastructure, not tribal memory. - Make the cloud foundations resilient enough that scaling the fleet doesn't put pressure on a single person. 2. Own AWS architecture and infrastructure-as-code - Design and evolve compute (Lambda, ECS, Batch), networking, storage and IAM across the DLM perimeter. - Bring the full stack under CDK - no manual AWS console clicks to ship a critical infra change. - Make trade-offs (serverless vs container, RDS vs DynamoDB, push vs pull) and explain them to the team without dogmatism. 3. Drive observability and reliability - Instrument logs, metrics, alerting that ops and engineers can act on. - Run on-call rotation, write post-mortems, keep runbooks current. - Move MTTR down quarter after quarter, with the numbers to prove it. 4. Ship backend services - Build and maintain backend services in Node.js / TypeScript (Python where it makes sense), at production grade. - Pair with the Tech Lead and the full-stack IC on infra-aware design from the spec stage - so trade-offs are made before the code, not discovered at review. 5. Become the cloud referent across teams - Within 12 months, represent CIOT-DLM in cross-team architectural discussions (Platform, Data Platform, NetSec, AI). - Take ownership of one major vertical at six months - provisioning, fleet drift detection, or RMS - and ship a measurable improvement on reliability or manual correction. ✅ WHO YOU ARE - 4-7 years of experience in cloud engineering, DevOps or SRE - at least three of them on AWS in production, on systems that real users depended on. - You've built APIs and shipped backend services in Node.js / TypeScript (or Python). "I don't really do APIs" is a non-starter for this role. - You've handled real production incidents - and when you talk about them, you're specific: timeline, decisions, what you'd do differently. - IoT, telecom or distributed systems exposure is a plus, not a requirement. Curiosity about what happens between the cloud and the physical world is. - You can operate within a scope set by a Tech Lead and a PM. When you disagree, you know how to express your concerns clearly, route it through the right channel, and move on if your solution isn't the one adopted collectively. - Hybrid work, three days a week from our Paris office. Full remote only won't fit how this team operates. At Vizzia, we care about ownership, ground-truth thinking, and getting things shipped. We're looking for someone who finds the right interface between a cloud stack and a real-world fleet. BENEFITS 🏡 Hybrid work 🏝 Contrat cadre and RTT (between 8 and 12 days per year depending on public holidays) 💻 A Mac or PC depending on your preferences 💸 BSPCE 🍜 60% coverage of meal vouchers worth €9 per worked day 🚃/🚲 Sustainable mobility allowance 🏥 Mutuelle (Alan) 💼 Offices located in central Paris (9th arrondissement) ☀️ Annual offsite with the whole team and plenty of company events RECRUITMENT PROCESS 1. Intro call with Marine (Talent Acquisition Manager) - 30 min 2. Technical deep-dive with Wilfried (Tech Lead) - 1 hour 3. Live pair-coding and architecture discussion with Jérôme (Head of Infra) - 1 hour 4. Product and team fit - 30 min 5. Final sign-off with Alexandre