Remote Founding Cryptography Engineer - Post-Quantum

PostQ; United States; Remote; USD 180,000 - 240,000; Full time

Benefits offered by this job

Remote-first role

Job summary

PostQ is seeking a senior cryptography engineer to own the core cryptographic systems of a post-quantum security platform. You will implement hybrid signing, PQC key exchange, and a verifiable transparency log, with an attested signing environment.

The role emphasizes correctness, auditable code, and clear rationale for security teams. The position requires strong Go skills (Rust preferred) and a track record of building security-sensitive systems.

Qualifications

• Strong Go programming skills.
• Rust experience preferred.
• Practical knowledge of cryptography, signatures, key encapsulation, hashing, X.509, TLS.

Responsibilities

• Design and implement hybrid signatures combining ML-DSA with Ed25519 or ECDSA, and ML-KEM key exchange.
• Build and maintain an RFC 6962 Merkle transparency log with consistency proofs and witness cosigning.
• Harden signing with envelope encryption, enclave attestation, and hardware-backed keys.
• Develop reference verifiers and keep behavior consistent across CLI, SDKs, and API.
• Apply NIST post-quantum cryptography standards and relevant specs in production code.

Skills

Go programming

Rust

Security architecture

Applied cryptography

Job description

PostQ is seeking a senior cryptography engineer to own the core cryptographic systems of a post-quantum security platform. You will implement hybrid signing, PQC key exchange, and a verifiable transparency log, with an attested signing environment.

The role emphasizes correctness, auditable code, and clear rationale for security teams. The position requires strong Go skills (Rust preferred) and a track record of building security-sensitive systems.