Backend Engineer / Slash Team

You'll join the team behind Riot's most ambitious product. Slash is email security that does what SPF, DMARC, and traditional filters can't: it reads emails the way an attacker writes them. We combine semantic analysis with technical signals to catch the sophisticated attacks that slip through everything else — and when something looks off, Albert steps directly inside the email to warn the employee before they click. Email security is a brutal problem. Attackers iterate fast, the false-positive tax is unforgiving, and "almost right" gets people phished. The team owns it end-to-end: detection logic, in-email alerts, the collective riposte that pulls confirmed threats from every inbox, and the Google Workspace and Microsoft 365 integrations underneath. The team is small, senior, and trusted. Engineers own features end-to-end and shape the product alongside PMs, designers — if a detection rule is wrong, you fix it. We ship fast, review hard, and use AI tooling aggressively to do both.
• Ship new Slash features end-to-end: detection logic, in-email experiences, admin tooling. • Build robust systems that analyze millions of emails a day with the latency and reliability email security demands. • Organize the backend code base and shape the standards the team follows. • Research, pitch, and prototype solutions to hard problems.
AI tooling isn't a perk at Riot — it's how we build. Every engineer has a Claude Max plan and access to Codex, and we expect you to use them daily. Concretely, that means: • Writing and reviewing code with Claude Code as a first-class collaborator, not an autocomplete. • Using MCP integrations so your AI tools have real context on our codebase, tickets, and specs. • Treating AI-first workflows as part of the craft: prompting well, knowing when to delegate to an agent vs. write it yourself, and sharing what works with the team. • Building and improving internal automation pipelines. If AI-assisted development still feels novel or optional to you, Riot isn't the right fit — and that's okay. We're building for engineers who already see this as the new baseline and want to push it further.
• Backend: Elixir, Phoenix, PostgreSQL, Oban, LiveView • Ops: AWS, Terraform, Datadog, Sentry • Frontend: Vue 3, TypeScript, Tailwind CSS, Cypress • AI tooling: Claude Code, Codex, Cubic
• You're a doer. That's core to Riot's culture. • You have 2+ years of experience building backend applications in production. • You're comfortable working professionally with SQL and relational data modeling. • You're already using AI coding tools seriously. • You're a team player, eager to give feedback and happy to receive it as a learning opportunity. • You know how to prioritize to ship on time — speed of execution is key, without compromising quality. • You don't need to be a cybersecurity expert, but you need to be motivated by the mission. • Elixir/Phoenix experience is a plus, not a requirement — we've onboarded strong engineers from Ruby, Python, and Go backgrounds. • You're based in Paris or willing to relocate.
• First call with Thomas, our Talent Acquisition Manager (30 min) • Technical interview — system design — with the Engineering Manager (1h) • Take-home case study • Onsite cultural fit interview with your manager and a future teammate (1h30) • Fit interview with our CTO (30 min)
• You have high standards: expect performance to be nothing short of the best. • You're enthusiastic at heart: you exhibit passion and excitement over the work. • You don't just use AI tools — you push them. You're already rethinking your workflow every few weeks as the tools evolve, and you'd be bored anywhere that isn't doing the same.
• Join a financially healthy company. We're capital-efficient, and fundraising fuels our momentum rather than keeping the lights on. • Contribute to a fast-growing startup with a clear vision and clear business goals. We've tripled revenue over the past two years and plan to grow from €20M to €40M ARR in 2026. • Work alongside a team that takes AI adoption seriously — you'll have the tools, the budget, and the mandate to push the boundary of what's possible with AI-assisted engineering. • Experience the energy of a collaborative team in our modern and cosy office in the heart of Paris: République / Canal Saint-Martin.