Principal Embedded Firmware Engineer — Edge & RTOS

Lunar Energy; San Francisco (CA); On-site; USD 230,000 - 260,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

Flexible Paid Time Off

10 paid holidays

Tax deferred 401(k) plan

Paid parental leave

Subsidized EV charging and pre-tax p 1

Job summary

Lunar Energy in San Francisco, CA, is seeking a Principal Embedded Firmware Engineer to shape the intelligence inside our hardware. You will develop firmware across the full embedded stack from bootloader to high-level application firmware, delivering reliable, efficient, and safe operation in homes worldwide.

You will work in a fast-moving team, collaborate across disciplines, and influence system architecture.

Qualifications

• 12+ years of experience developing and architecting software for embedded systems.
• Expert in C for bare-metal or RTOS environments.
• Experience integrating hardware and software to deliver end-to-end solutions.
• Strong collaboration in a fast-moving, small-team setting.
• Proficient with modern software practices (Git, CI).

Responsibilities

• Develop firmware for our hardware devices, including optimisation on the edge.
• Design, code, and test sub-systems that provide high-performance functionality on constrained hardware.
• Write code across the full embedded stack — from bootloader to high-level application firmware. Develop platform firmware to support components like flash file systems, communication stacks, and build tool management.
• Work in a RTOS environment, including porting and maintenance of the RTOS.
• Build component firmware that integrates with other parts of the Lunar system.
• Drive design discussions on system architecture to achieve the desired product functionality.
• Collaborate with the team on design and development, including participating in code reviews.
• Support system test, reliability, and manufacturing teams with special firmware features and debugging.
• Review performance data from the Lunar system gathered at internal and external test sites.

Skills

Embedded firmware

C programming

RTOS

Hardware integration

Git

CI/CD

Bare-metal development

Tools

Flash file systems

Build tools

Power electronics firmware

Job description

Lunar Energy in San Francisco, CA, is seeking a Principal Embedded Firmware Engineer to shape the intelligence inside our hardware. You will develop firmware across the full embedded stack from bootloader to high-level application firmware, delivering reliable, efficient, and safe operation in homes worldwide.

You will work in a fast-moving team, collaborate across disciplines, and influence system architecture.