LMI is looking for a Firmware Designer to join our hardware team and contribute to the development of IoT devices and sensors for the Department of Defense. You will design and implement firmware for embedded systems across active asset tags, sensors, and edge devices critical for mission-readiness, working closely with hardware engineers, cloud software teams, and external partners.

What You'll Do

Design, develop, test, and optimize firmware for embedded systems, ensuring reliability and efficiency.
Collaborate with hardware teams to develop firmware solutions tailored to wireless embedded designs.
Implement firmware control for peripherals such as RF modules, sensors, and communication interfaces like Bluetooth, LoRa, satellites, or LTE.
Conduct debugging, testing, and refinement of firmware in rugged and mission-critical environments.
Contribute to field testing and provide firmware updates to ensure hardware performance meets defense-grade standards.
Work with cross-functional teams to ensure seamless integration between hardware, software, and DevSecOps solutions.
Maintain firmware revision control and manage versioning across projects.
Ensure firmware complies with security protocols and certifications such as MIL-STD, FIPS, or FCC.

What We're Looking For

5+ years of experience in firmware design for embedded systems, preferably in IoT, RF devices, or mission-critical environments.
Strong understanding of processor level development and the ability to understand and develop using proprietary real-time operating systems (RTOS).
Embedded Linux development including device drivers and TCP/IP networking.
Strong understanding of developing firmware for very low-power battery-based applications.
Hands-on experience with communication protocols like Bluetooth, LoRa, LTE, or similar.
Proven expertise debugging, testing, and validating firmware in hardware environments.
Proficiency in C/C++ for embedded systems development.
Proficiency in Python.
Familiarity with microcontrollers and architectures, such as ARM Cortex-M or STM.
Experience with IDEs and debugging tools such as Keil, IAR, or Segger.
Knowledge of hardware interfaces like SPI, I2C, and UART.
Understanding of DFM and DFT principles related to firmware-hardware integration.
Experience in developing firmware with a unit test approach.
Builder's mindset with a solutions-oriented approach to solving technical challenges.
U.S. Citizenship with eligibility to obtain and maintain a government security clearance.
Bachelor’s degree in Electrical Engineering, Computer Engineering, or related field.

Nice to Have

Advanced degree a plus.
Hands-on experience developing firmware that complies with FIPS 140-2 and/or FIPS 140-3.
Experience prototyping firmware for ruggedized IoT devices used in defense, logistics, or industrial settings.
Familiarity with tools for secure firmware delivery and updates.
Knowledge of wireless and cellular IoT firmware systems, including power optimization techniques.
Ability to work in early-stage product development environments or spin-out business units.