Staff Firmware Engineer

iRhythm Technologies, Inc. • San Francisco, CA

1d • Hybrid

About The Position

Career-defining. Life-changing. At iRhythm, you’ll have the opportunity to grow your skills and your career while impacting the lives of people around the world. iRhythm is shaping a future where everyone, everywhere can access the best possible cardiac health solutions. Every day, we collaborate, create, and constantly reimagine what’s possible. We think big and move fast, driven by our commitment to put patients first and improve lives. We need builders like you. Curious and innovative problem solvers looking for the chance to meaningfully shape the future of cardiac health, our company, and your career. 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. This is a hands-on staff-level role for an engineer who can own firmware projects end to end: understanding product needs, defining scope, making architecture decisions, implementing robust code, and mentoring other engineers along the way. You will work on resource-constrained, bare-metal systems and contribute across the full firmware lifecycle, including new product development, iterative product releases, debugging, failure investigations, code reviews, documentation, and cross-functional problem solving. Success in this role requires strong technical judgment, attention to detail, and the ability to make sound decisions in a regulated environment with product, system, and patient impact in mind. This role also plays a key part in shaping firmware-side cybersecurity decisions. In partnership with product security and cross-functional stakeholders, you will guide technical decisions related to secure architecture and implementation for the device. This is a hybrid position, offering the flexibility to work remotely while maintaining hands-on collaboration with on-site engineering and operations teams. The number of days on-site may vary week to week based on project needs.

Requirements

• 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 and firmware integration.
• Working knowledge of embedded cybersecurity principles and the ability to guide firmware implementation decisions, with familiarity in one or more areas such as cryptographic design choices, secure boot or bootloader strategy, key storage, or secure update design.
• Experience investigating complex system issues and driving root cause to resolution.
• Strong 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.

Nice To Haves

• 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, vulnerability response, and related regulatory expectations.
• Experience contributing to documentation and design control activities in a regulated environment.
• Familiarity with coding standards such as MISRA and with 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.

Responsibilities

• 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, including areas such as cryptographic design choices, secure boot and 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 and system software engineering, software quality assurance, quality, and other stakeholders.
• Contribute to documentation and design control artifacts in compliance with IEC 62304, ISO 13485, 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.

Benefits

• competitive compensation package
• excellent benefits, including medical, dental, and vision insurance (all of which start on your first day)
• paid holidays
• PTO

What This Job Offers

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