Cryptography Firmware Engineer

LMI • Remote,

2d • $90,000 - $130,000 • Remote

About The Position

LMI is seeking a Cryptography Firmware Engineer to support the development of secure embedded systems for next-generation mesh networking products for Department of Defense customers. This role involves implementing embedded cryptographic capabilities, integrating hardware security features, and developing secure key management solutions across LMI’s product portfolio. The ideal candidate will have experience with embedded firmware development and an interest in applied cryptography. Responsibilities include integrating the Nordic nRF54L Series AES-256 hardware accelerator, developing secure firmware features, and building a repeatable test environment to validate cryptographic functionality and fleet-wide key management processes. U.S. citizenship is required, and candidates must be eligible to obtain a Secret security clearance, with an active clearance being preferred. LMI is a digital solutions provider focused on accelerating government impact through innovation and speed, leveraging commercial-grade platforms and mission-ready AI for federal agencies. They serve the defense, space, healthcare, and energy sectors, headquartered in Tysons, Virginia.

Requirements

• Bachelor’s degree in Electrical Engineering, Computer Engineering, Computer Science, Cybersecurity, or a related STEM field.
• 3–6 years of embedded firmware development experience using C/C++.
• Experience developing firmware for embedded microcontrollers.
• Basic understanding of applied cryptography, including AES encryption, secure key storage, and authentication.
• Familiarity with embedded hardware peripherals and communication interfaces such as SPI, UART, I2C, and GPIO.
• Experience debugging embedded systems using standard development tools.
• Strong analytical and troubleshooting skills.
• Ability to work effectively within a multidisciplinary engineering team.
• U.S. citizenship and the ability to obtain a Secret security clearance.

Nice To Haves

• Experience with Nordic Semiconductor nRF54 Series microcontrollers.
• Experience implementing hardware cryptographic accelerators or secure elements.
• Familiarity with secure boot, secure firmware updates, and device provisioning.
• Experience developing key management or certificate management solutions.
• Familiarity with FIPS 140-3 or other embedded security standards.
• Experience supporting DoD or government technology programs.
• Active Secret security clearance.

Responsibilities

• Develop and maintain embedded firmware supporting secure communications and cryptographic functionality.
• Integrate and optimize use of the nRF54L Series AES-256 hardware accelerator within embedded firmware.
• Design, implement, and validate secure key management capabilities for embedded devices.
• Develop and maintain a cryptographic test laboratory to support verification of encryption, authentication, and key management processes.
• Create repeatable test procedures for device provisioning, key rotation, and fleet-wide cryptographic key updates.
• Collaborate with hardware, firmware, cybersecurity, and systems engineering teams to implement secure embedded architectures.
• Support hardware integration, firmware validation, and production readiness activities.
• Participate in design reviews and contribute to security architecture discussions.
• Document firmware designs, cryptographic workflows, and validation procedures.
• Support customer demonstrations, lab testing, and occasional field integration activities.

Benefits

• Approximately 10–20% travel for customer support, engineering collaboration, hardware integration, manufacturing coordination, and field testing as required.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level