Staff Cryptography Engineer

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Staff Cryptography Engineer in Others new

IonQ
Full time
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Others
10/02/2026
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Geneva, Switzerland

Responsibilities

Implement and maintain reference, bit-accurate, and optimized software models for ML-KEM, ML-DSA, SLH-DSA, and LMS.
Develop constant-time implementations of cryptographic functions in C, C++, and Rust.
Build known-answer-test and test-vector tooling using NIST ACVP for verification and CAVP certification.
Decompose algorithms into hardware-friendly components including Keccak, NTT, polynomial arithmetic, samplers, and encode/decode operations.
Support RTL and firmware engineers with algorithm questions, debugging, and certification-oriented tooling.
Evaluate third-party cryptographic libraries.

Requirements

Master’s degree in cryptography, mathematics, computer science, or a related field; PhD is a plus.
At least five years of experience implementing cryptographic algorithms or security-critical software in C, C++, or Rust.
Strong hands-on C, C++, or Rust development skills and solid understanding of modern cryptographic primitives.
Understanding of constant-time implementation and its security importance.
Ideally, exposure to post-quantum schemes, including lattice-based or hash-based cryptography, and their underlying mathematics.
Familiarity with NIST test-vector formats, CAVP, or ACVP and certification-oriented development is preferred.
Fluency in English is required; French or German is advantageous.
Ability to write readable, well-tested code and work on products with demanding correctness and security requirements.

Benefits

The role is based onsite in Geneva, Switzerland, with flexible work models also offered.
Competitive compensation, benefits package, and equity plan; no specific base salary is posted.
Ongoing training, development, and a career development plan within IonQ group companies.
Comprehensive medical, dental, and vision plans, matching 401(k), unlimited PTO, paid holidays, parental/adoption leave, legal insurance, and a home technology stipend.
Global collaboration in a close-knit environment with access to experienced cryptographic engineers.

Salary: Competitive

IonQ

IonQ, Inc. [NYSE: IONQ] is the world’s leading quantum platform and foundry - delivering integrated quantum solutions across computing, networking, sensing, and security. IonQ’s newest generation of quantum computers, the forthcoming IonQ Tempo, will be the latest in a line of cutting-edge system...

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