Junior Firmware Engineer Jobs (NOW HIRING)

Location: San Francisco, CA (94103) – Hybrid (three days onsite, two days remote, number of days may vary by project).

We are looking for a curious, detail-oriented, and self‑motivated Staff Firmware Engineer to join our small firmware team and help shape the future of our medical devices. In this hands‑on staff‑level role you will own firmware projects end‑to‑end, from requirements, scoping, architecture, and implementation to verification and release, while acting as a technical leader and mentor.

• Own firmware projects from concept through release, including requirements, scoping, architecture, implementation, integration, and support for verification and release activities.
• Serve as a hands‑on technical leader on a small firmware team, balancing architecture work, development, mentoring, and investigation of complex issues.
• Guide firmware‑side cybersecurity decisions in partnership with product security, covering cryptographic design, secure boot/bootloader strategy, key hierarchy and storage, and secure firmware update or FOTA design.
• Develop high‑quality firmware for resource‑constrained, MCU‑based embedded systems with a strong emphasis on reliability, readability, and maintainability.
• Lead deep root‑cause investigations for complex and sometimes rare product issues across firmware, hardware, manufacturing, wireless, power, and system interactions.
• Define and evolve firmware interfaces with electrical engineering, manufacturing, backend, system software engineering, software quality assurance, quality, and other stakeholders.
• Contribute to documentation and design control artifacts in compliance with IEC62304, ISO13485, and related development processes.
• Mentor junior engineers through design discussions, code reviews, and day‑to‑day technical guidance.
• Use lab equipment and hands‑on debugging techniques to bring up hardware, characterize issues, and validate behavior on‑device.

• Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, or a related field.
• 10+ years of hands‑on firmware development experience in resource‑constrained embedded systems, preferably MCU‑based and bare‑metal.
• Experience owning substantial firmware work or projects from architecture through implementation and release.
• Experience working in a regulated industry; medical device experience is preferred.
• Strong proficiency in C for embedded systems.
• Strong experience with board bring‑up, lab debugging, and hardware‑firmware integration.
• Knowledge of embedded cybersecurity principles and ability to guide firmware implementation decisions.
• Experience investigating complex system issues and driving root‑cause resolution.
• Attention to detail and sound engineering judgment.
• Experience working cross‑functionally with hardware and software teams in a structured development environment.
• Strong communication, analytical, and problem‑solving skills.

• Experience with connected, wireless, or battery‑powered embedded devices.
• Familiarity with technologies such as BLE or cellular connectivity.
• Broader familiarity with cybersecurity concepts relevant to connected embedded or medical devices, such as threat modeling and vulnerability response.
• Experience contributing to documentation and design control activities in a regulated environment.
• Familiarity with coding standards such as MISRA and peer code review practices.
• Experience with static and dynamic code analysis techniques for firmware development.
• Experience with version control, release processes, CI/CD, test infrastructure, or other development tooling improvements.
• Experience developing embedded firmware using Zephyr RTOS, including device tree, Kconfig, driver development, and kernel services.

• Full‑time position with a competitive compensation package.
• Annual estimated pay range: $190,000.00 – $247,000.00.
• Excellent benefits including medical, dental, and vision insurance (effective first day), paid holidays, and PTO.

iRhythm Technologies, Inc. is an Equal Opportunity Employer. We will consider for employment all qualified applicants with arrest and conviction records in accordance with all applicable laws. We provide reasonable accommodations for qualified individuals with disabilities in job application procedures. If you need an accommodation, please contact taops@irhythmtech.com.