Senior Cryptography Engineer

Job Description

Job Title: Senior Cryptography Engineer. Location: Geneva, Switzerland

Responsibilities:

• Implement reference models, optimized software, and test-vector infrastructure for ML-KEM, ML-DSA, and SLH-DSA/LMS
• Develop constant-time implementations of cryptographic functions
• Build known-answer tests and NIST ACVP test-vector tooling for verification and CAVP certification
• Implement models in C, C++, Rust, and Python;
• Contribute to hardware-friendly building blocks including Keccak, NTT, polynomial arithmetic, samplers, and encode/decode functions
• Support RTL and firmware engineers with algorithm questions, debugging, and certification-oriented tooling
• Evaluate third-party cryptographic libraries
• Work with senior cryptography engineers on applied cryptography projects

Qualifications:

• Master’s degree or higher in Cryptography, Mathematics, Computer Science, or a related field
• At least 5 years of experience implementing cryptographic algorithms or security-critical software
• Strong C, C++, or Rust development skills
• Solid understanding of modern cryptographic primitives;
• Understanding of constant-time implementation and its importance for security
• Strong focus on correctness, readable code, and thorough testing
• Fluency in English
• French or German is an advantage

Preferred:

• Experience with post-quantum cryptography, particularly lattice-based or hash-based schemes
• Experience with NIST test-vector formats, CAVP, or ACVP
• Experience developing certification-oriented cryptographic software
• Strong interest in developing deep expertise in applied post-quantum cryptography

Benefits and Compensation:

• Competitive compensation package
• Benefits package and equity plan
• Flexible work models
• Ongoing training and professional development
• Career development opportunities within the IonQ group
• Collaborative environment with a global team of experts
• Medical, dental, and vision plans
• Matching 401(k), unlimited PTO, and paid holidays
• Parental and adoption leave
• Legal insurance
• Home technology stipend

Other Information:

• Compensation depends on education, qualifications, experience, location, market data, and internal equity
• Employment is subject to applicable background and risk screening;
• The role involves access to technology subject to U.S. export control and government contract restrictions
• Additional immigration and authorization information may be required for export-control compliance
• IonQ is an equal opportunity employer committed to a diverse and inclusive workplace