Senior Cryptography Engineer in Genève

Senior Cryptography Engineer at IonQ, Geneva, Switzerland. A senior-level full time position in the Quantum Platform - Network & Security team, listed under software engineering.Job ID: 1893ID Quantique (IDQ), part of IonQ, is a global leader in quantum-safe communications. We provide solutions to protect governments, telecommunication infrastructures, and banking & financial institutions from the “harvest-now, decrypt-later” threat, delivering both terrestrial and space-based quantum-safe networks in live operation globally.The RoleWe are looking for a Staff Cryptography Engineer to join our team building post-quantum cryptography (PQC) hardware acceleration for HSM and network-appliance products. You will implement the software side of modern post-quantum algorithms: reference models, optimised implementations, and the test infrastructure that proves they are correct. This is a hands-on development role at the heart of applied cryptography, working with some of the most experienced cryptographic engineers in the field.ResponsibilitiesYou will implement and maintain reference and bit-accurate models of ML-KEM, ML-DSA and SLH-DSA/LMS in C/C++/Rust and Python, develop constant-time software implementations of cryptographic functions, and build out the known-answer-test and test-vector tooling (NIST ACVP) used for verification and CAVP certification. You will contribute to the decomposition of algorithms into hardware-friendly building blocks (Keccak, NTT and polynomial arithmetic, samplers, encode/decode), support RTL and firmware engineers with algorithm questions and debugging, and help evaluate third-party cryptographic libraries, working under the guidance of our senior cryptography engineers.Implement reference models, optimised software and test-vector infrastructure for ML-KEM, ML-DSA and SLH-DSA/LMSSupport hardware and firmware teams with algorithm expertise, debugging and certification-oriented toolingBenefitsA role at one of the fastest growing and most exciting quantum companies in the worldA competitive compensation scheme, benefits package, and equity plan designed to reward excellenceFlexible work models that let you balance your life, your family, and your careerOngoing training and development to keep your skills sharp and your growth on trackA career development plan within the IonQ group’s companiesA dynamic, close-knit environment where you collaborate with a global team of expertsA performance-driven culture built on trust, teamwork, and shared ambition #J-18808-Ljbffr