Firmware Engineer III

Fluxergy • Irvine, CA

40d • $120,000 - $135,000

About The Position

We’re looking for an engineer who’s ready to level up—not just in skill, but in impact. This role is built for someone who enjoys solving complex, not-fully-defined problems and wants to play an active part in shaping the product. You’ll be working on a system that’s evolving in real time, where your ideas and contributions directly influence what gets built and how it performs.
You thrive in collaborative environments where ownership is shared, ideas are challenged, and progress happens as a team. You’re naturally curious, comfortable with ambiguity, and motivated by building something meaningful—not just maintaining it. If you enjoy turning complexity into clarity and want to grow alongside a team tackling hard problems together, you’ll feel right at home here.

Requirements

• 5+ years developing and releasing firmware for embedded or IoT devices
• Familiarity with embedded Linux, Yocto, and at least one RTOS
• Proficiency in C (C98) and C++ (C++11)
• Experience with bring-up, verification, and troubleshooting of embedded systems
• Ability to design and improve communication protocols like UART, SPI, and I2C
• Willingness to experiment, iterate, and apply quantitative analysis to improve systems
• Ability to work effectively across teams and clearly document and share work
• Comfort navigating ambiguity and tackling unforeseen challenges in a system built from the ground up
• Ability to read schematics

Nice To Haves

• Background in medical devices or similar industries is highly valued
• Have worked on an FDA regulated project
• Are familiar with safety critical design processes and controls

Responsibilities

• Develop, test, and release firmware for embedded and IoT-based systems
• Ensure firmware reliability, performance, and quality across all stages of development
• Bring up, verify, and debug new hardware systems, including the Fluxergy Analyzer
• Collaborate with cross-functional teams to support system integration and troubleshoot issues
• Identify, analyze, and resolve bugs or system-level challenges as they arise
• Design and improve intra-device communication interfaces (UART, SPI, I2C)
• Explore and implement new methodologies to enhance existing features, backed by data-driven analysis
• Participate in code reviews across teams and contribute to engineering best practices
• Create and maintain clear, thorough technical documentation
• Build internal tools to support development, testing, and team efficiency
• Be an awesome team member (see team culture bullets above).

Benefits

• Excellent Medical/Dental Benefits
• 95% medical benefit premiums paid by Fluxergy and covers employee, partner, and dependents
• 100% dental and vision premiums paid for employee, partner, and dependents
• 100% Life Insurance premiums paid for the employee
• Work - Life Balance Minded Time Off
• 15 paid vacation days
• 2-week paid winter break
• 7 company paid holidays
• 5 paid sick days
• A Work Culture Which Believes in Promoting from Within
• Wear lots of hats / accelerate your career growth!
• We are a flat organization by design – lots of visibility!
• Many of our current leaders started their career with Fluxergy!

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 11-50 employees