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