Principal Engineer - Classical Cryptography & Architecture

About the role

IonQ, a quantum computing company, is hiring a Principal Engineer to own the classical cryptography architecture of its post-quantum cryptography (PQC) hardware acceleration products, which target hardware security modules (HSM) and network appliances. The role is based in Geneva, Switzerland, and works alongside the PQC architecture leadership on hybrid classical and post-quantum schemes, crypto-agility and key management.

Key responsibilities

• Own the architecture and implementation strategy of the classical cryptographic functions: symmetric ciphers and modes (AES/GCM and beyond), hash functions (SHA-2/SHA-3, HMAC/KDF), RSA/ECC offload, and true random number generation and entropy (SP 800-90A/B/C).
• Define hybrid classical/post-quantum schemes (key establishment, dual signatures, composite certificates) and the crypto-agility mechanisms that let customers migrate safely.
• Track the standardisation of hybrid approaches (NIST guidance, IETF work on hybrid key establishment in TLS 1.3 and IKEv2, composite certificates) with the PQC architects.
• Guide RTL and software engineers implementing classical cores, evaluate third-party IP, and support FIPS 140-3 and CAVP certification of the classical algorithm suite.
• Own key-management and key-hierarchy architecture, ensuring interoperability with deployed HSM, TLS and IPsec ecosystems.

Required profile

• Master's or PhD in Cryptography, Computer Science, Electrical Engineering or a related field.
• At least twelve years of experience implementing and architecting classical cryptography in real products, in hardware, software or both.
• Proven architect of classical cryptographic subsystems with certification experience (FIPS 140-3, CAVP, Common Criteria).
• Fluency in English; French or German is an advantage.

Required skills

• Deep command of symmetric and asymmetric primitives, modes of operation, key management and entropy generation.
• Working knowledge of NIST post-quantum algorithms (ML-KEM, ML-DSA, SLH-DSA) and hybrid schemes.
• Understanding of HSM, PKI, TLS and IPsec ecosystems and of hybrid classical/PQC standardisation.

What we offer

• A competitive compensation scheme, benefits package and equity plan.
• Flexible work models and ongoing training and development.
• A career development plan within the IonQ group and a close-knit, performance-driven environment.