Founding Engineer (£60k-£120k + Equity) at Tracebit

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Founding Engineer Salary £60k-£120k + Equity Company Description $20M Series A cloud security startup backed by FirstMark and Accel Job Description Join a high-calibre engineering team building the future of cloud intrusion detection. You will develop intelligent canary tripwires that protect massive clients like Riot Games and Docker. Working directly with the founders, you'll ship daily to process billions of events using a powerful stack of C#, .NET Core, and AWS. Location London, UK Why this role is remarkable Join one of the UK's most exciting startups, recently raising a $20M Series A led by FirstMark and featured on Sifted's 2025 "London Startups To Watch." Experience explosive growth with a company that doubled ARR last quarter and plans to triple its headcount over the next year. High-impact work environment where you will solve real-world problems, such as uncovering P1 security flaws in major AI platforms like Google Gemini. What You Will Do Build and scale a cloud-native security product using C# on .NET Core 10, Terraform, and HTMX within an AWS environment. Collaborate face-to-face with technical founders and high-profile customers to translate security research into robust, production-ready detection features. Take ownership of end-to-end delivery in a low-bureaucracy environment, shipping code daily and maintaining infrastructure as code for planetary-scale event processing. The ideal candidate Proven track record of shipping software at scale or in critical environments, ideally within a product-focused company or high-growth startup. Strong proficiency in any object-oriented language; while we use C#, we value architectural instinct and engineering quality over specific language syntax. A proactive builder who thrives in an on-site, collaborative culture and is excited by the pace of an early-stage company defining a new security category. Who are Jack & Jill? Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. How does this work? Jack's an AI agent for job searching and career coaching. He works for you. Jill is the AI recruiter working for the company. She recruits from Jack's network. If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.