Senior Systems and Infrastructure Engineer, Information Security, Post-Quantum Cryptography (PQC)

Senior Systems and Infrastructure Engineer, Information Security, Post-Quantum Cryptography (PQC)

We are seeking a highly experienced and strategic Senior Systems and Infrastructure Engineer, Information Security with deep expertise in Post-Quantum Cryptography (PQC) to join our Cryptography team. In this role, you will serve as a technical leader driving the design, adoption, and evolution of quantum-resistant cryptographic solutions across enterprise systems. You will play a critical role in shaping long-term security strategy, influencing architecture decisions, and ensuring resilience against emerging cryptographic threats.

Join a forward-thinking team at the forefront of cryptographic innovation. You will have the opportunity to shape how the organization prepares for the quantum era, building resilient, future-proof security solutions that protect critical systems and data. At Walmart, we offer competitive pay as well as performance-based bonus awards and other great benefits for a happier mind, body, and wallet.

What You'll Do

• Lead the design and architecture of secure systems and applications, providing expert guidance on integrating Post-Quantum Cryptography into enterprise environments.
• Define and drive cryptographic strategy and roadmap, ensuring alignment with evolving PQC standards (e.g., NIST PQC) and organizational security objectives.
• Evaluate and guide adoption of cryptographic technologies, including key exchange mechanisms, digital signatures, and message authentication schemes in a post-quantum context.
• Partner with hardware and cryptographic vendors to influence product direction, evaluate capabilities, and ensure alignment with long-term security requirements.
• Assess emerging threats and advancements in quantum computing and cryptography, translating research into actionable engineering practices and risk mitigation strategies.
• Design, implement, and oversee enterprise-scale cryptographic solutions, ensuring compliance with industry standards and regulatory requirements.
• Drive modernization of security protocols (e.g., TLS, SSH, IPsec) to support hybrid and quantum-resistant cryptographic approaches.
• Mentor and guide engineers, establishing best practices for secure development, cryptographic implementation, and infrastructure security.
• Lead cross-functional initiatives, collaborating with engineering, infrastructure, and security teams to embed cryptographic controls into platforms and services.
• Communicate complex cryptographic concepts and risks to senior leadership, architects, and non-technical stakeholders to support informed decision-making.

Qualifications

• Advanced expertise in cryptographic systems, including key exchange protocols, digital signatures, and message authentication codes, with real-world implementation experience.
• Deep understanding of Post-Quantum Cryptography, including algorithms, migration strategies, and impact on existing systems.
• Strong experience with modern security protocols (TLS, SSH, IPsec) and their cryptographic foundations.
• Proven ability to design and scale secure architectures in large, complex enterprise environments.
• Demonstrated experience leading technical initiatives and influencing architecture decisions across teams.
• Excellent communication and stakeholder management skills, with the ability to translate complex concepts into clear guidance.
• Strong analytical, problem-solving, and risk assessment capabilities.
• Experience working with hardware security modules (HSMs) or cryptographic hardware is highly desirable.
• Relevant certifications (e.g., CISSP, Security+, or advanced cryptography/security credentials) are a plus.

Minimum Qualifications

Outlined below are the required minimum qualifications for this position. If none are listed, there are no minimum qualifications.

Option 1: Bachelor's degree in computer science, information technology, engineering, information systems, cybersecurity, or related area and 3 years' experience in systems and infrastructure engineering or related area at a technology, retail, or data-driven company. Option 2: 5 years' experience in systems and infrastructure engineering or related area at a technology, retail, or data-driven company.

Preferred Qualifications

Outlined below are the optional preferred qualifications for this position. If none are listed, there are no preferred qualifications.

Certification in Security+, GISF, CISSP, CCSP, or GSEC, Master's degree in computer science, information technology, engineering, information systems, cybersecurity or related area and 1 year's experience leading information security or cybersecurity projects. We value candidates with a background in creating inclusive digital experiences, demonstrating knowledge in implementing Web Content Accessibility Guidelines (WCAG) 2.2 AA standards, assistive technologies, and integrating digital accessibility seamlessly. The ideal candidate would have knowledge of accessibility best practices and join us as we continue to create accessible products and services following Walmart's accessibility standards and guidelines for supporting an inclusive culture.

Primary Location

805 Se Moberly Ln., Bentonville, AR 72712, United States of America Walmart and its subsidiaries are committed to maintaining a drug-free workplace and has a no tolerance policy regarding the use of illegal drugs and alcohol on the job. This policy applies to all employees and aims to create a safe and productive work environment.