RF Embedded Systems Engineer (IoT + DoD Sensors)

LMI is a new breed of digital solutions provider dedicated to accelerating government impact with innovation and speed. Investing in technology and prototypes ahead of need, LMI brings commercial-grade platforms and mission-ready AI to federal agencies at commercial speed.

Leveraging our mission-ready technology and solutions, proven expertise in federal deployment, and strategic relationships, we enhance outcomes for the government, efficiently and effectively. With a focus on agility and collaboration, LMI serves the defense, space, healthcare, and energy sectors-helping agencies navigate complexity and outpace change. Headquartered in Tysons, Virginia, LMI is committed to delivering impactful results that strengthen missions and drive lasting value.

The Opportunity

We're hiring a Senior RF Embedded Systems Engineer to lead the design, development, and prototyping of our next-generation IoT tracking devices. You'll be the first technical hire on the hardware engineering side-owning circuit design, firmware, integration, and RF performance in a tight feedback loop with product and manufacturing teams.

This is a high-impact, hands-on role where you'll take a concept from napkin sketch to functional prototype, validate performance, and work closely with our GM of Hardware and contract manufacturers to scale it into production.

What You'll Do

Design and prototype embedded systems for low-power, RF-connected devices (LoRa, LTE-M, BLE, GNSS, etc.).
• Develop and debug firmware on microcontrollers using C/C++
• Design and test RF circuits, antennas, and matching networks for reliable comms in field environments.
• Build and validate custom PCBs (schematics, layout guidance, component selection).
• Conduct bench-level testing, including signal analysis, power profiling, and RF range validation.
• Implement FIPS 140-3 compliant encryption and secure boot mechanisms to meet DoD cybersecurity requirements.
• Create test plans and documentation for transitioning prototypes to manufacturing.
• Collaborate closely with contract manufacturers and hardware leads to support DFM, DFT, and QA workflows.
• Support FCC, TAA, or MIL-STD pre-certification efforts as needed.

What We're Looking For

• 5+ years of experience designing embedded systems with integrated RF components.
• Strong knowledge of RF fundamentals, modulation, and low-power wireless protocols.
• Experience with embedded firmware development and debugging in constrained environments.
• Proficient in lab testing with tools like oscilloscopes, spectrum/network analyzers, and signal generators.
• Familiarity with implementing FIPS-compliant cryptographic modules and secure key storage.
• Able to take full ownership of board bring-up, debug, and field validation.
• S. Citizenship with the ability to obtain and maintain a government security clearance.

Bonus Points For

• Experience with LoRa, LTE-M/NB-IoT, GNSS, UWB, or BLE in constrained environments.
• Previous work in DoD, aerospace, industrial IoT, or high-reliability sectors.
• Familiarity with Altium, KiCad, or similar for schematic capture and layout review.
• Python, MATLAB, or similar for signal/data processing and RF analysis.
• Hands-on experience with environmental or EMI/EMC testing workflows.
• Open-source hardware or firmware contributions.

Why This Role Matters

You won't just be coding firmware or simulating RF-you'll be building the foundation of a new hardware product line that's headed straight into real-world military use. You'll see your designs go from bench to battlefield.

Build cool tags. Apply today.