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Senior Security Engineer, Research & Engineering
Join Trail of Bits as a Senior Security Engineer to advance security through innovative research and practical solutions. Work remotely in the UK and help secure critical systems against emerging threats.
Location: Remote within the United Kingdom
Who We Are:
Founded in 2012 by 3 expert hackers with no investment capital, Trail of Bits is the premier place for security experts to boldly advance security and address technology's newest and most challenging risks. It has helped secure some of the world's most targeted organizations and devices. Our combination of novel research with practical solutions reduces the security risks that our clients face from emerging technologies. Our work helps drive the security industry and the public's understanding of the technology that underlies our world. Cybersecurity preparedness is a moving target. Companies like ours are the tip of the spear in the fight against attackers. Our research-based and custom-engineering approach ensures that our clients' capabilities are at the forefront of what's available. For companies and technologies that live and die by their security, a proactive, tailored approach is required to keep one step ahead of attackers. Democratizing security information is essential. As part of our business, we provide ongoing informational support through blogs, whitepapers, newsletters, meetups, and open-source tools. The more the community understands security, the more they'll understand why a company like ours is so unique and valuable.What You'll Achieve
- Break systems built to resist you. Compromise designs and production software whose authors had a proof assistant on their side, and demonstrate it with a working exploit rather than a written argument.
- Map the real attack surface of a proof. Establish the formal property, the level it holds, the threat model behind it, and the underlying assumptions, then show the client which of those give way under pressure.
- Build the tooling that decides your coverage. Design and extend the AI-driven discovery and triage systems that determine how much of a target a single engineer can reach within a short window.
- Write the assessment that becomes the record. Set out what held, what did not, and what you attempted without success, clearly enough that the result stands up to the product developers.
- Raise the practice around you. Publish tooling and methodology, write for the blog, present internally, and pull what one engagement learns into the next.
What You'll Bring
- Red teaming. Direct experience with red teaming production software, personally responsible for finding and proving exploitable vulnerabilities. Hands-on offensive work, not exercise coordination or scanner triage.
- Building AI tools that find bugs. Experience building AI-driven tooling for vulnerability discovery, such as agentic harnesses, LLM-assisted triage pipelines, or automated exploit generation. You have written this tooling, not only used someone else's.
- Formal methods. Experience applying formal methods to system designs and code implementations, including reading specifications and proof artifacts and reasoning about what a machine-checked proof does and does not establish. You can read at least one of Lean, Rocq, F*, Dafny, or Verus/Rust.
- Depth in a systems domain. Experience finding vulnerabilities in network protocol implementations, operating system internals, open-source software, cryptographic implementations, or AI inference infrastructure.
- Software development. Experience in Python, C++, and/or Rust.
- Written findings for expert readers. Experience producing security assessment reports for an audience that will scrutinize every claim.
- Delivery to a fixed external schedule with defined acceptance criteria.
- Vulnerability Disclosure. Experience in the ethical reporting of vulnerabilities in technology.
Benefits, Perks & Wellness
Trail of Bits is our people, not a place. With more than 100 team members working across time zones around the globe, our remote-first culture is built on autonomy and trust.Empowered Living:
- Competitive compensation complemented by performance-based bonuses.
Work & Life Enrichment:
- $1,000 Working-from-Home stipend to create a comfortable and productive home office.
- Annual $750 Learning & Development stipend for continuous personal and professional growth.
- Company-sponsored all-team celebrations, including travel and accommodation, to foster community and recognize achievements.
Community Impact:
- Philanthropic contribution matching up to $2,000 annually.