Staff Fullstack Software Engineer - Safety

🎯 Mission

Today, one engineer owns the entire Safety and VMS stack. The roadmap is loaded: a UK videoverbalization MVP due in June 2026, a France rollout in Q4, a live videoverbalization feature in Q1 2027 — all running in parallel, all critical. That's not a backlog problem. It's a capacity problem.

Vizzia has grown from €4M to €9M ARR and is on its way to €30M, now serving 200+ local authorities across France and the UK. Our Safety platform is at the core of that growth — and the frontend needs to be built from scratch, on a solid architectural foundation, before the next wave of clients lands.

You'll join a small, focused team: Jeremy (Staff Engineer, your direct lead), Jean-Baptiste (Cloud Engineer), Hadrien (PM), and Walid (Designer). The team is intentionally lean — and will stay that way. Your mission: become Jeremy's technical partner, architect the Safety code base from the ground up, and make sure the roadmap ships on time.

🛠️ What You'll Do

1. Build the Frontend from Scratch

The mockups are in progress. The stack is defined. What's missing is the person who will turn this into a scalable, maintainable product.

• Architect and build the Safety SaaS frontend using React 19, Vite, TypeScript, Tailwind CSS v4

• Co-design and maintain the design system with Walid — tokens from Figma, components in shadcn/ui, documented in Storybook

• Implement state management (Zustand), server state (TanStack Query), forms (React Hook Form), and i18n (i18next) in a coherent, well-structured way

• Build a custom video player (MediaBunny/MOQs/WebRTC) and handle video streaming requirements

2. Deliver a Critical Roadmap

• Ship the UK videoverbalization MVP in production by end of June 2026

• Contribute directly to the France rollout (Q4 2026) and live videoverbalization (Q1 2027)

• Size tasks reliably and flag blockers early — no surprises at sprint review

3. Own Code Quality

• Maintain unit test coverage above 85% on all code you touch

• Set up and maintain end-to-end tests with Vitest & playwright across the full application

• Write PRs that are readable without a deep dive — clear scope, clean diffs, useful context

4. Co-architect with Jeremy

• Make joint decisions on architecture, patterns, and technical direction — not just execute

• Challenge Jeremy's choices constructively, and expect the same in return

• Take ownership of technical decisions and stand behind them, with arguments

5. Set the Foundation for the Team

• Document conventions, contribution rules, and architectural decisions from day one

• Intervene on the backend (Node.js, Hono, Drizzle ORM) and infra (Docker, K8s, Helm, CI/CD) when needed — at least enough to never be blocked

• Onboard the 1–2 engineers joining in 2027 and become the natural technical reference

✅ Who You Are

• You have 5+ years of experience, including meaningful time in a fast-paced SaaS or scale-up environment — and you've built (or significantly structured) a product from scratch

• You are an expert in modern React and its ecosystem: Zustand, TanStack Query, React Hook Form, advanced hooks, performance patterns — your state management choices are justified, not defaulted to

• You've shipped a scalable frontend architecture before: design system, component library, reusability patterns — and it was still being used 18 months later

• You have solid Node.js / TypeScript fundamentals — enough to own the full stack when needed, not just the client side

• You actively use AI coding tools (Cursor, Claude Code, Copilot) to move faster without compromising quality

• You don't wait for perfect specs. You challenge the PM and designer when something doesn't make sense — with arguments, not ego. You're the kind of engineer who makes the team around them better, not just the codebase.

An engineering degree is required for this job

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. Video call with Talent Acquisition

2. Hiring Manager interview + culture fit with Jeremy (Hiring Manager) — 45 min

3. Technical case study — frontend & backend

4. Team interviews — PM, Designer, Cloud Engineer

5. Final interview with CTO