Senior Software Engineer

Responsibilities

• Analyse how specific anti-bot and bot-mitigation systems (the likes of DataDome, Cloudflare Turnstile, Kasada, PerimeterX and Akamai) detect and block us, and design systems to work around them.
• Turn isolated breakthroughs into durable, repeatable processes: hypothesis, test, discard what's wrong, move on.
• In collaboration with other senior team members, design and build a greenfield agentic environment that can propose and run tests on anti-bot behaviour and bypass approaches, and do it in a way that's well understood and repeatable.
• Work largely independently on deep, concentrated problems, while actively pulling in knowledge from across the wider engineering team.
• Communicate clearly what you plan to do, and step into major incidents when the team needs your depth.
• What you bring to the table
• Deep, genuine understanding of how the internet works underneath: HTTP, TLS and fingerprinting, proxies, headers, cookies, and browser behaviour. This is the core of the role and it isn't something we can shortcut.
• Excellent problem-solving built on a scientific, methodical approach: you form a hypothesis, design a test, read the result honestly, and iterate. Trying things at random is the opposite of what this role needs.
• Strong hands-on skills in our stack, Node.js and TypeScript with solid Python, and comfort across backend systems at scale (Postgres, Redis/Valkey, MongoDB, Puppeteer/Camoufox, Kubernetes).
• Real skill at directing AI coding agents with precision, and the judgement to tell strong output from weak. The specific tool doesn't matter (Claude, Codex or similar); knowing how to steer it well is what counts.

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