---
title: 'Senior Firmware Engineer - Communications at Lunar Energy'
canonical: 'https://feeny.ai/job/senior-firmware-engineer-communications-lunar-energy-mountain-view-6a760gcrw8nd'
type: 'job'
last_seen: '2026-09-09'
---

# Senior Firmware Engineer - Communications at Lunar Energy

- **Company:** Lunar Energy
- **Location:** Mountain View, CA
- **Posted:** 2026-09-03
- **Last confirmed live:** 2026-09-09
- **Apply:** https://job-boards.greenhouse.io/lunarenergy/jobs/6181858004

## Job description

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.

## About Lunar Energy

## Company Overview
- **One-liner**: Lunar Energy builds an ecosystem of all-electric home products, starting with a next-generation home battery and solar system paired with an AI-powered energy management platform.
- **Entity Type**: Private (Series D, 2026)
- **Headquarters**: Mountain View, California, United States
- **Founded**: 2020
- **Founders**: Kunal Girotra

## Core Business
Lunar Energy designs, manufactures, and deploys integrated solar + battery storage systems for homes. Its AI‑driven Gridshare software optimizes energy flows between home batteries, EV chargers, and the grid. The company serves homeowners directly (B2C) and partners with utilities and energy retailers to manage distributed energy resources. Mission: “Power homes around the world with endless clean energy.”

## Products & Services
- **[Lunar System]** – A home solar and battery system that captures, stores, and uses solar energy day and night, including during outages. Hardware product, sold through installers.
- **[Gridshare Software]** – An AI-powered energy management platform that controls distributed energy resources (home batteries, EV chargers) to maximize homeowner savings and support grid stability. SaaS/software product embedded in every system.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed.
- **Key Metric**: Total funding of **$532.0 M** raised across 3+ rounds (latest: Series D of $102 M in February 2026). Estimated annual revenue of **$3.0 M** (LinkedIn estimate).
- **Notable Investors/Partners**: Prelude Ventures and B Capital (co-led Series D); Activate Capital Partners (led Series C); other investors include those in a $300 M venture round (2022). Acquired Moixa Energy, a UK‑based smart battery company.
- **Growth Signals**: Growing headcount 7.8% YoY to 183 employees; operations in 9 countries including the US, UK, Japan, Canada, Spain, UAE, and France; Forbes named Lunar Energy one of America’s Best Startup Employers in 2023.

## Competitive Advantages
- **Deep industry expertise**: Founder Kunal Girotra was formerly head of Tesla Energy; several senior leaders (e.g., Chief Architect Mark Holveck, SVP Chris Wright) have Tesla and cleantech backgrounds.
- **Integrated hardware + software moat**: The Lunar System combines proprietary battery hardware with an intelligent software platform that can manage third‑party DERs, creating a sticky ecosystem.
- **Global reach from inception**: Products already deployed in three continents, with a clear plan to expand through acquisitions (Moixa) and partnerships.

## Strategic Focus
- Scale production and geographic footprint (especially US, UK, Japan).
- Deepen Gridshare capabilities with AI and utility‑grid integration.
- Expand product ecosystem beyond solar+battery (e.g., EV charging, smart home controls).
- Grow commercial channels through regional sales managers and solution architects (as seen in recent job postings).

## Why Work Here
- **Culture**: Described as a team of “builders and doers” with a collaborative and inclusive environment. Emphasis on making a global impact on clean energy transition.
- **Work model**: Headquarters in Mountain View, CA; UK offices in London and Manchester. Hybrid and remote options available for specific roles.
- **Total rewards**: Competitive salary, equity in a growing company, comprehensive benefits (location‑specific), and encouragement of work‑life balance with generous time off.
- **Engineering focus**: Strong investment in software, firmware, systems engineering, and hardware reliability – 16 active openings across Manufacturing, Software, Systems, Firmware, Sales, and more.

## Sources
1. [lunarenergy.com](https://www.lunarenergy.com/about) – About page, team, mission
2. [lunarenergy.com](https://www.lunarenergy.com/careers) – Careers page, culture, benefits
3. [linkedin.com](https://www.linkedin.com/company/lunarenergyinc) – Company details, funding, headcount, revenue
4. [job-boards.greenhouse.io](https://job-boards.greenhouse.io/lunarenergy) – Active job listings

## Other roles at Lunar Energy

- [Corporate Development Manager](https://feeny.ai/job/corporate-development-manager-lunar-energy-united-kingdom-2ek5jmnrw6hp) — United Kingdom
- [Staff Reliability Engineer - Power Electronics](https://feeny.ai/job/staff-reliability-engineer-power-electronics-lunar-energy-mountain-view-ashrkzjd70f9) — Mountain View, CA
- [Senior Reliability Engineer - Power Electronics](https://feeny.ai/job/senior-reliability-engineer-power-electronics-lunar-energy-mountain-view-qkgq6qcqnpf6) — Mountain View, CA
- [Electrical Engineer - ATE](https://feeny.ai/job/electrical-engineer-ate-lunar-energy-mountain-view-5k43nfa272wg) — Mountain View, CA
- [Senior Electrical Supervisor](https://feeny.ai/job/senior-electrical-supervisor-lunar-energy-united-kingdom-nzz8f180c5ft) — United Kingdom
- [Electronics Design Engineering Intern](https://feeny.ai/job/electronics-design-engineering-intern-lunar-energy-mountain-view-e1z0hhhv5ewm) — Mountain View, CA
- [PCB Layout Engineer](https://feeny.ai/job/pcb-layout-engineer-lunar-energy-mountain-view-gpvrys9j9thj) — Mountain View, CA
- [Engineering Technician II, Test Operations (Contract)](https://feeny.ai/job/engineering-technician-ii-test-operations-contract-lunar-energy-mountain-view-73xb6b9ajzsh) — Mountain View, CA
- [Data Infrastructure Engineer (contract)](https://feeny.ai/job/data-infrastructure-engineer-contract-lunar-energy-mountain-view-zsynrxhxakmj) — Mountain View, CA
- [Staff Firmware Engineer](https://feeny.ai/job/staff-firmware-engineer-lunar-energy-united-kingdom-vacq85t52fv4) — United Kingdom