Post-Quantum Cryptography Engineer

SoftQuantus; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

SoftQuantus is seeking a cryptography engineer to own the post-quantum cryptography inside QuantumLock. You will extend signing and key management, harden the implementation, and ensure that public statements about cryptography are accurate.

You will work on ML-DSA, ML-KEM and SLH-DSA, design the missing encapsulation/decapsulation paths, build test vectors and negative tests, and prepare the code for independent review and validation.

Qualifications

• Hands-on experience implementing or integrating cryptographic primitives (≤140 chars).
• Working knowledge of lattice-based schemes and the NIST standards (≤140 chars).
• A careful habit of separating what is proven from what is assumed (≤140 chars).

Responsibilities

• Implement and review the signing and key paths in QuantumLock
• Design the missing encapsulation and decapsulation path
• Build test vectors, fuzzing and negative tests for every cryptographic operation
• Prepare the implementation for independent review and validation
• Review every public statement about the cryptography before it is published

Skills

Cryptographic primitives

Lattice-based cryptography

NIST standards

Tools

liboqs

Job description

Remote Europe, Tallinn, Estonia Posted November 5, 2026

About this role

Own the post-quantum cryptography inside QuantumLock. Licence tokens are signed with ML-DSA-65 through liboqs today, and ML-KEM-768 and SLH-DSA are limited to key generation. You extend that work, harden the implementation and keep what we say about it accurate.

Focus Areas

• ML-DSA, ML-KEM and SLH-DSA (FIPS 204, 203 and 205)
• Key management, rotation and hardware security modules
• Constant-time code and side-channel resistance
• Hybrid classical and post-quantum schemes

Responsibilities

• Implement and review the signing and key paths in QuantumLock
• Design the missing encapsulation and decapsulation path
• Build test vectors, fuzzing and negative tests for every cryptographic operation
• Prepare the implementation for independent review and validation
• Review every public statement about the cryptography before it is published

Requirements

• Hands-on experience implementing or integrating cryptographic primitives
• Working knowledge of lattice-based schemes and the NIST standards
• A careful habit of separating what is proven from what is assumed

Nice to Have

• Experience with liboqs or a comparable library
• Experience with FIPS 140-3 or CAVP validation
• Published cryptanalysis or implementation work

Skills & Keywords

Compute and quantum hardware engineering