Senior Firmware Engineer - Communications
Lunar Energy
Mountain View, CA · Posted September 3, 2026
We last confirmed this job open on October 28, 2026. Check the employer’s site to see if it is still taking applications.
Just laid off? Start here: a plan for the first weeks
See every open role at Lunar Energy
More in California job market · Energy & Utilities · Engineering jobs
More roles at Lunar Energy
- Electrical Engineer - ATE · Mountain View, CA
Similar jobs
- Principal Software Engineer – Mobile Software Architecture · Qualcomm Technologies · San Diego, CA
- Principal Software Engineer, Agentic UX · Workday · Pleasanton, CA
- Senior Software Engineer · Workday · Pleasanton, CA
- Sr. Staff Field Applications Engineer · Infineon Technologies · San Jose, CA
- Senior Embedded Software Engineer · Paccar · Sunnyvale, CA
- Sr. Software Engineer - Sensor - Cloud Runtime Protection (Hybrid) · CrowdStrike Holdings · Sunnyvale, CA
Where Mountain View, CA ranks
Where Mountain View, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Best cities for AI-skill jobs45% · of 100
- #1Best cities for AI-skill jobs in the West Coast45% · of 71
- #1Best cities for mid-career professionals in the West Coast68% · of 71
- #1Best all-round cities for mid-career professionals in the West Coast85 / 100 · of 39
- #1Best all-round cities for AI careers in the West Coast96 / 100 · of 39
- #2Best cities for finance pay after cost of living$161k · of 35
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
Among software developers, AI is already used for some of the tasks. Measured exposure for software developers: 29% (some).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
Skills this job asks for
Say which you have and which you want to build. We use it to match you to jobs like this one.
About the job
Sr Firmware Engineer
Embedded/Firmware Engineers at Lunar will be responsible for the full product development lifecycle of our products’ firmware and software, which are important sources of functionality, adaptability, and optimization of our designs. We are looking for people who are passionate about a more sustainable future, and want to make that vision a reality. An ideal candidate is excited and ready to collaborate closely with a dedicated, cross-functional team to deliver innovative, best-in-class products. Engineers at Lunar are hands-on and involved in all aspects of the product, and own the design from forming concepts based on first principles to managing high-volume production quality.
Lunar Energy was founded to transition homes to 100% clean energy—making our electricity greener, our air cleaner and our energy more safe, secure and reliable for all. We’re a fast-growing, global company building the world’s best clean energy products to electrify all homes and connect communities to form clean, resilient virtual power plants.
On a given day at Lunar, you’ll likely…
Work collaboratively with other disciplines across the company to continuously refine and improve our understanding of how our products can create the greatest impact, get to market quickly, and operate reliably for our customers
Help us create the best possible products by brainstorming and evaluating new features and solutions and weighing pros and cons to narrow down options.
Test ideas and designs: back-of-the envelope calculations, building simulations and designing validation tests
Design firmware software that runs in our home energy product components: Power electronics controls, system-level behaviors and optimization, mobile app design and interfaces, system diagnostics and updates, RF and powerline communication protocols, control algorithms, and installation automation features.
Optimize manufacturing by designing automation support functionality in our components whose design reflects the part they play in the processes that create them and test them, and by supporting our features within our manufacturing partners
Ideal Candidate Skills:
Ideal candidates will have development experience with a wireless mesh network framework like esp-wifi-mesh, and will have been part of a development team which released high volume products where 24/7 communications reliability was a core requirement.
Desired Skills:
Degree in a computer-engineering related or adjacent field, or demonstrated commensurate ability.
5+ years experience delivering firmware for new products as part of a team.
Experience with communication protocols, CAN, Protocol Buffers
Espressif ESP-IDF product development experience
Embedded Ethernet stacks, TCP/IP, BSD Socket API, HTTPS
Wireless communication experience: WiFi, WiFi Mesh, Bluetooth/BLE, BLE-Mesh
Proficiency in C, and working familiarity with cmake and Python
Working knowledge of Oscilloscopes, Logic Analyzers and other lab test equipment
Benefits:
We’re dedicated to creating a remarkable employee experience. At Lunar, competitive base pay is one part of our total compensation package. Lunar employees also have the opportunity to become Lunar shareholders by getting equity in a fast-growing company and participating in our employee stock program.
Additional benefits include:
Medical, dental, and vision insurance for employees and dependents
Flexible Paid Time Off plus 10 paid holidays
Tax deferred 401(k) plan
Paid parental leave for all full time employees including 12 weeks paid parental leave for the birthing mother and 6 weeks paid parental leave for the non-birthing parent
Subsidized EV charging and pre-tax commuter benefits
Our DE&I Philosophy: Lunar Energy is an equal opportunity employer. We are committed to attracting, developing and retaining diverse talent by supporting an inclusive workplace. Lunar recruits, hires, trains, promotes, compensates, and administers all personnel actions without regard to race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status or any other status protected by applicable law.
Our Compensation Philosophy: Our goal is to ensure that all Lunar Energy employees are fairly compensated. Please note that the salary range information that follows is a good faith estimate for this position provided pursuant to the Pay Transparency for Pay Equity Act for California applicants. The salary range estimate for this position depending on level of experience is $120,000 - $175,000 USD
The actual offer, reflecting the total compensation package & benefits, will be at the company’s sole discretion, and determined by factors including but not limited to years of experience, job level, geographic location, and other relevant business considerations. The company also reserves the right to amend or modify this job description, employee perks, and benefits at any time.