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.
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Founding Engineer at Tracebit
We are looking for a Founding Engineer to join one of London's fastest-growing security startups following a $20M Series A led by FirstMark. This is a rare opportunity to build at the ground floor with a team that has already doubled ARR and signed clients like Riot Games and Snyk. If you want to ship high-scale C# code daily, fix critical security flaws in global AI systems, and work directly with technical founders in a high-energy London office, this role is for you. Help us define the next generation of cloud intrusion detection.
About this role
Role overview
About the company
Tracebit
Computer and Network Security24 employees
$20M Series A cloud security startup backed by FirstMark and Accel
What you'll do
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.
Who you are
Who this is a fit for
- 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.
Why this role
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.
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