Senior Cryptography Engineer

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Senior 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++, Rust, and Python.
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 functions.
Support RTL and firmware engineers with cryptographic algorithm expertise, debugging, and certification-oriented tooling.
Evaluate third-party cryptographic libraries and contribute to HSM and network-appliance products.

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 understanding of modern cryptographic primitives and preferably exposure to lattice-based or hash-based post-quantum schemes.
Understanding of constant-time implementation and its security importance.
Strong C/C++/Rust development skills and a commitment to correct, readable, well-tested code.
Familiarity with NIST test-vector formats, CAVP/ACVP, or certification-oriented development is a plus.
Fluency in English is required; French or German is an advantage.

Benefits

Onsite role based in Geneva, Switzerland, with flexible work models.
Competitive compensation, benefits package, and equity plan.
Ongoing training and development and a career development plan within IonQ group companies.
Global, collaborative work environment with experienced quantum and cryptography specialists.
Comprehensive medical, dental, and vision plans, matching 401(k), unlimited PTO, paid holidays, parental/adoption leave, legal insurance, and a home technology stipend.

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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