Senior Post-Quantum Cryptography and Quantum Computing Engineer

As a Senior Post-Quantum Cryptography and Quantum Computing Engineer at Greenbrier Government Solutions, you will help the U.S. Department of Veterans Affairs prepare for the transition to post-quantum cryptography while protecting today's systems. This full-time role requires someone who can work at the algorithm and implementation level, then communicate migration risk and priorities to program and executive leaders.

What you'll do

• Build and maintain an enterprise cryptographic inventory covering algorithms, protocols, libraries, certificates, keys, PKI dependencies, products, interfaces, and data-protection use cases.
• Assess quantum exposure and prioritize systems and dependencies using data sensitivity, required protection lifetime, exploitability, modernization timing, and mission impact.
• Develop practical post-quantum migration roadmaps, transition patterns, crypto-agility requirements, implementation guidance, test plans, and exception criteria.
• Evaluate quantum-resistant algorithms and implementations against NIST standards, including FIPS 203, FIPS 204, and FIPS 205, as well as applicable federal and industry guidance.
• Model and test classical and quantum attack considerations using appropriate simulation tools and programming frameworks.
• Review RSA, AES, PKI, TLS, key-management, signing, and data-at-rest or data-in-transit implementations for modernization needs and interoperability risk.
• Work with architecture, application, cloud, network, identity, data-protection, supply-chain, and acquisition teams to sequence migration with other planned change.
• Prepare policy inputs, decision papers, technical briefs, and executive summaries that explain quantum risk without overstating certainty.

What you bring

• At least 10 years of IT experience, including at least 5 years of quantum-computing and cryptography work at a large corporation or government agency comparable in size or scope to GSA, IRS, DoD, or VA.
• Knowledge of quantum mechanics, quantum information theory, and quantum algorithms such as Shor's and Grover's algorithms.
• Experience with quantum programming languages or frameworks such as Qiskit, Cirq, Quipper, or the Microsoft Quantum Development Kit.
• Strong knowledge of cryptographic protocols and technologies, including RSA, AES, and public key infrastructure.
• Experience with post-quantum cryptography, quantum-resistant algorithms, and NIST or ISO/IEC cryptographic standards, including ISO/IEC 19790.
• Proficiency in Python, C++, or Java for implementing and testing cryptographic algorithms, plus experience with classical and quantum simulation tools.
• Experience developing PQC migration strategies, assessing cryptographic inventories, identifying migration priorities, and explaining quantum risk to nontechnical leaders.
• Experience providing policy and guidance input aligned with NIST PQC standards, including FIPS 203, 204, and 205.
• A Bachelor's degree in business administration, business management, cybersecurity, computer science, information systems, information assurance, information security, information resource management, or a related field.
• One or more of the following certifications: IAT III, IAM III, or IASAE III.

Nice to have

• Hands-on experience with cryptographic discovery, certificate or key-management platforms, hardware security modules, crypto bills of materials, or algorithm-agility programs.
• Experience planning cryptographic modernization across hybrid cloud, legacy systems, medical or specialized devices, and third-party products.
• Federal cybersecurity architecture, RMF/ATO, or VA experience.

What we offer

• 401(k) with matching contributions
• Dental and vision insurance
• Life insurance
• Paid time off and paid parental leave
• Flexible schedule
• Professional development assistance
• Referral program
• U.S.-based remote work from a Greenbrier-approved location; routine onsite work is not expected
• Availability required during VA core hours, 8:00 a.m. to 5:00 p.m. Eastern Time on normal federal workdays
• Occasional travel or onsite support for kickoff and other government-directed events, with Washington, DC anticipated as the primary location

About Greenbrier Government Solutions

Greenbrier Government Solutions, Inc. supports federal customers with cybersecurity architecture, engineering, risk management, and technology services. The company works alongside government leaders and technical staff to turn policy, risk, and operational needs into practical security outcomes.