Senior Software Engineer

Senior Software Engineer | Start-up | Cybersecurity | London | Hybrid

Hyre AI is partnering with a fast‑growing, well‑funded cybersecurity company on a mission to solve one of the biggest challenges on the modern internet: proving who’s human in a world dominated by bots, scripts, and AI impersonators. Their technology protects some of the most trusted names in financial services and beyond, and they’ve just raised a multi‑million seed round to accelerate growth.

Now they’re hiring a Senior Software Engineer to join a small, exceptional team building the future of online trust.

As a Senior Software Engineer, you’ll be at the core of how our client builds and runs their platform; you won’t just be building features – you will help strengthen and evolve an already‑live product, bringing structure and engineering judgment to an environment where foundations exist, but priorities and solutions are still being shaped as the company grows.

• Design and scale high‑throughput APIs and microservices that power AI‑driven fraud and bot detection engines.
• Work on production systems where latency, reliability, and real‑world failure modes genuinely matter, and where engineering decisions have immediate customer impact.
• Work directly with founders, product, and research teams to deeply understand emerging threats, and build systems that turn detection insights into operational reality.
• Be encouraged to experiment, challenge convention, and proactively identify areas for improvement.

NB: this role requires 3‑4 days on‑site in the office, ~ 5 mins from Liverpool St Station.

• 3‑5 years of professional experience in software engineering.
• Experience with Type Script and/or Go is beneficial (but not mandatory).
• Strong foundation in Kubernetes and CI/CD pipelines.
• A resourceful, first‑principles mindset; someone who thrives in ambiguity.
• Ownership, curiosity, and a commitment to building things that last.
• High‑energy, thoughtful problem‑solving, and a low‑ego approach to collaboration.
• Experience in an early‑stage start‑up or scaling environment would be a huge bonus.

• Competitive salary: £70,000 – £80,000
• Stock options – share in the company's growth
• Employer‑matched pension

If you want to work on a deeply meaningful problem, build with exceptionally talented engineers, and play a pivotal role in scaling a product that sits at the intersection of cybersecurity, AI, and internet infrastructure, this is the kind of opportunity that appears once in a career.