Senior Cryptography Engineer

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Senior Cryptography Engineer in Others

IonQ
Full time
Email

Others
09/20/2026
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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 cryptographic functions in C, C++, Rust, and Python.
Build known-answer-test and test-vector infrastructure using NIST ACVP for verification and CAVP certification.
Contribute to hardware-friendly algorithm decomposition involving Keccak, NTT, polynomial arithmetic, samplers, and encode/decode operations.
Support RTL and firmware engineers with algorithm expertise, debugging, and certification-oriented tooling.
Evaluate third-party cryptographic libraries.

Requirements

Master's degree in Cryptography, Mathematics, Computer Science, or a related field; a 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 development skills in cryptographic or security-critical software.
Solid understanding of modern cryptographic primitives and constant-time implementation practices.
Ideally, exposure to post-quantum schemes, including lattice-based or hash-based cryptography, and their underlying mathematics.
Familiarity with NIST test-vector formats, CAVP/ACVP, or certification-oriented development is preferred.
Fluency in English is required; French or German is an advantage.

Benefits

Onsite role based in Geneva, Switzerland.
Flexible work models, ongoing training and development, and a career development plan.
Benefits include medical, dental, and vision plans, matching 401(k), unlimited PTO, paid holidays, parental/adoption leave, legal insurance, and a home technology stipend.
Competitive compensation, benefits package, and equity plan are offered, with details provided during the offer process.
Global, collaborative work environment with experienced quantum and cryptography professionals.

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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