projecteleven - Senior Security Engineer

• 5+ years in security engineering, with significant ownership of a production security program (not purely advisory or audit-side) • Experience securing systems at meaningful scale with strong correctness, durability, or regulatory requirements • Strong applied cryptography knowledge: key management, signing protocols, secure key handling at rest and in use • Experience taking an organisation through SOC 2, ISO 27001, or equivalent • Hands-on experience with cloud security (AWS) and modern deployment platforms; comfortable reading and writing infrastructure code • Track record of partnering with engineering teams rather than gating them; you ship security improvements as code and policy, not just tickets • Strong threat modeling instincts and the ability to make pragmatic risk tradeoffs in a fast-moving startup environment • Strong English communication, including the ability to represent security clearly to institutional customers and auditors • WHAT WE'D LOVE TO SEE • Background in institutional digital-asset infrastructure: custody platforms, exchanges, HSM-backed systems, or regulated financial infrastructure • Experience with MPC, threshold signing, HSM integration, or other distributed cryptographic protocols in production • Familiarity with post-quantum cryptography and the operational implications of migrating cryptographic primitives • Experience running incident response for a security-critical product • Prior experience as the first security hire at a startup, or building a security function from scratch • Offensive security background (red team, pentesting, vulnerability research) as a complement to defensive work • Open-source contributions to security tooling, cryptography, or related infrastructure • EQUAL OPPORTUNITY • We are committed to equal employment opportunity and believe that diverse teams build better products. All qualified applicants will receive consideration without regard to any protected characteristic under applicable law.