{"id":665228,"url":"https://alion.io/job/projecteleven-senior-backend-engineer","title":"Senior Backend Engineer","company":{"id":685549,"name":"Project Eleven","domain":"projecteleven.com","url":"https://alion.io/company/projecteleven","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["GB"],"hiring_countries_total":1,"salary":null,"salary_estimate":{"min_usd":89000,"max_usd":182000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":29},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"ISO 27001","optional":false},{"name":"Rust","optional":false},{"name":"SOC 2","optional":false},{"name":"Threat Modeling","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2025-12-19T12:56:26Z","employer_posted_date":"2025-12-19","last_verified_at":"2026-11-04T08:59:35Z","board_verified":true,"closed_at":null,"days_open":319,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":319},"description":"About Project Eleven\nProject Eleven is an applied lab of builders and technologists working at the intersection of quantum computing and cryptography. We build impactful solutions that push the digital-asset ecosystem to a more secure future. Our focus is post-quantum migration: upgrading wallets, identity, and settlement rails to quantum-safe primitives without breaking UX, composability, and developer workflows.\nOur mission is to future-proof digital assets and preserve self-sovereignty in a post-quantum world. We do that by building the canonical tooling and products teams can adopt: crypto-agile infrastructure, reference implementations, and integrations that fit real constraints like latency, cost, compatibility, key rotation, and recovery.\nWe work with leading ecosystems to make this migration real through products we build, audits, testnets, and cutting edge research. The vision we are have is clear: a proven upgrade path, production-ready tooling and users retaining control of their assets and identity, before CRQC exists.\nThe role\nWe're looking for a Senior Backend Engineer to join our growing Product Engineering team. You'll play a pivotal role in building the canonical infrastructure that protects institutional digital-asset operations in a post-quantum world.\nThis role is a full-time, fully remote position in Europe (GMT to GMT+2).\nWhat you'll be responsible for\nOwning and evolving security-critical backend services at the core of our institutional product\n\nDesigning and implementing systems with strict correctness, durability, and auditability guarantees\n\nEnforcing strict security boundaries around sensitive operations and data\n\nDefining and upholding API stability, versioning, and backward-compatibility policies\n\nContributing to internal security standards, threat modeling, and engineering best practices\n\nPartnering with our cryptography and research engineers to bring novel primitives into production systems\n\nWhat you bring\nStrong proficiency in Rust and TypeScript (ideally both)\n\nExperience building performant backend services, APIs, and libraries at production scale\n\nExperience designing systems with strong security, durability, or correctness requirements e.g. financial systems, key management, identity, custody, or other regulated infrastructure\n\nSolid applied cryptography fundamentals: signing, encryption, secrets management, key handling\n\nGood knowledge of CI/CD, service deployments, and containerisation\n\nHigh competency with automated testing (unit, integration, and e2e)\n\nStrong English communication\n\nWhat we'd love to see\nExperience building or operating institutional infrastructure: custody platforms, HSM-backed systems, KMS, or similar high-assurance systems\n\nFamiliarity with threshold signing, MPC, or HSM integration patterns\n\nExposure to compliance frameworks (SOC 2, ISO 27001) and audit-friendly system design\n\nExperience with post-quantum cryptography or the operational implications of migrating cryptographic primitives\n\nExperience developing and maintaining long-lived libraries or protocols with strong backward-compatibility requirements\n\nOpen-source contributions to cryptography, security, or related infrastructure\n\nEqual Opportunity\nWe are committed to equal employment opportunity and believe that diverse teams build better products. 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