Modem Firmware Engineer – Embedded & Satellite

Stealth Startup; San Diego (CA); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Stock options

Flexible hours

Occasional WFH

Job summary

Stealth Startup, a stealth-mode deep-tech company near San Diego, is building a satellite-connected asset tracker that is cheaper than competitors. We seek a Modem Firmware Engineer to bridge silicon and application software, optimize battery life, and ensure reliable satellite communication.

You will develop embedded firmware for ARM Cortex‑M, using Rust and C/C++, and work closely with hardware engineers on board bring-up and interfaces. Join a small, fast-moving team with ownership and impact.

Qualifications

• Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, or equivalent
• 2–10+ years of embedded firmware development experience (leveling is flexible based on experience)
• Strong proficiency in Rust and/or C/C++ in resource-constrained environments
• Proven track record of shipping firmware for physical hardware products
• Confidence working independently in a fast-paced, build-it-from-scratch environment

Responsibilities

• Build an AI-first firmware organization that covers application and modem firmware, plus location tech like GPS processing and multilateration
• Architect and develop firmware for embedded microcontrollers (ARM Cortex‑M) in Rust, C/C++
• Collaborate with hardware engineers to bring up boards and verify interfaces (SPI, I2C, UART)
• Implement aggressive power-management strategies for multi-year battery life
• Develop and optimize drivers for satellite modems and RF transceivers
• Build bootloaders, OTA update mechanisms, and manufacturing test suites
• Develop edge intelligence for on-device asset state detection to minimize satellite airtime
• Use logic analyzers, oscilloscopes, and JTAG/SWD for troubleshooting timing issues
• Lead the firmware release process from local testing to field deployments

Skills

Rust

C/C++

Embedded systems

ARM Cortex-M

Firmware shipping

Education

Bachelor's degree in CS/CE/EE

Tools

FreeRTOS

Zephyr

DSP/SDR knowledge

GPS/Modem protocols

Job description

Stealth Startup, a stealth-mode deep-tech company near San Diego, is building a satellite-connected asset tracker that is cheaper than competitors. We seek a Modem Firmware Engineer to bridge silicon and application software, optimize battery life, and ensure reliable satellite communication.

You will develop embedded firmware for ARM Cortex‑M, using Rust and C/C++, and work closely with hardware engineers on board bring-up and interfaces. Join a small, fast-moving team with ownership and impact.