Quantum Cryptography Engineer

📋 Description Lead the post-quantum cryptography roadmap: signatures, KEMs, threshold schemes, hybrid migration, crypto-agility Design and implement cryptographic primitives in Rust - lattice-based (ML-KEM, ML-DSA / Dilithium), hash-based (SLH-DSA, XMSS, LMS), and hybrid constructions combining classical and PQ schemes Re-architect or hybridize core protocol primitives (Ed25519, BLS, Schnorr) with quantum-resistant analogues without regressing on latency, signature size, or throughput Design crypto-agility into the protocol from day one: key rotation, algorithm negotiation, in-place migration paths that don't require destructive hard forks Build threshold, aggregate, and multi-signature schemes for validator consensus, including post-quantum-friendly variants Own randomness: distributed key generation (DKG), verifiable random functions (VRFs), and post-quantum-secure leader election 🎯 Requirements Deep working knowledge of modern cryptography: signatures, KEMs, hash functions, ZK proofs, threshold schemes, MPC Strong familiarity with the post-quantum landscape - lattice cryptography (LWE, Module-LWE, NTRU), hash-based signatures, code-based schemes, and the security/performance trade-offs between them Track record of implementing cryptographic primitives in production code (Rust strongly preferred; C/C++ acceptable for systems-level work) Ability to read an IACR paper on Friday and have a correct, constant-time prototype by Monday Strong understanding of: Provable security, reduction proofs, and the gap between security models and real-world systems Experience with blockchain cryptography including randomness, threshold signatures, account abstraction, or zkLogin/Keyless 🎁 Benefits Lead a migration from classical to post-quantum security Work at the intersection of cryptography and distributed systems at scale Direct collaboration with protocol, consensus, and runtime engineers Competitive compensation with meaningful upside Shape cryptographic posture for decades