Staff Cryptography Engineer at IonQ, Geneva, Switzerland. A lead-level full time position in the Quantum Platform - Network & Security team, listed under software engineering.
The Role
We 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.
Responsibilities
You 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/LMS
- Support hardware and firmware teams with algorithm expertise, debugging and certification-oriented tooling
Requirements
We are looking for a candidate with a Master’s degree (PhD a plus) in Cryptography, Mathematics, Computer Science or a related field and at least five years of experience implementing cryptographic algorithms or security-critical software in C/C++ or Rust. You have solid understanding of modern cryptographic primitives and ideally first exposure to post-quantum schemes (lattice-based or hash-based) and their underlying mathematics.
Benefits
- A role at one of the fastest growing and most exciting quantum companies in the world
- A competitive compensation scheme, benefits package, and equity plan designed to reward excellence
- Flexible work models that let you balance your life, your family, and your career
- Ongoing training and development to keep your skills sharp and your growth on track
- A career development plan within the IonQ group’s companies
- A dynamic, close-knit environment where you collaborate with a global team of experts
- A performance-driven culture built on trust, teamwork, and shared ambition
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Staff Cryptography Engineer in Genf Arbeitgeber: Entangled Future
IonQ ist ein hervorragender Arbeitgeber, der seinen Mitarbeitern in Genf, Schweiz, eine dynamische und innovative Arbeitsumgebung bietet. Mit einem starken Fokus auf persönliche und berufliche Weiterentwicklung sowie einer offenen Unternehmenskultur fördert IonQ die Zusammenarbeit und Kreativität im Bereich der quantenbasierten Technologien. Die Möglichkeit, an bahnbrechenden Projekten zu arbeiten und Teil eines globalen Teams zu sein, das an der Spitze der Quantenkommunikation steht, macht IonQ zu einem attraktiven Arbeitsplatz für Fachkräfte, die einen bedeutenden Beitrag leisten möchten.
