--- title: 'Staff Firmware Engineer at Lunar Energy' canonical: 'https://feeny.ai/job/staff-firmware-engineer-lunar-energy-united-kingdom-vacq85t52fv4' type: 'job' last_seen: '2026-09-16' --- # Staff Firmware Engineer at Lunar Energy - **Company:** Lunar Energy - **Location:** United Kingdom - **Posted:** 2026-08-18 - **Last confirmed live:** 2026-09-16 - **Apply:** https://job-boards.greenhouse.io/lunarenergy/jobs/6146606004 ## Job description Staff 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… - Develop wireless network communication solutions for high-volume products, ensuring continuous 24/7 reliability - Design firmware software that runs in our home energy product components: RF communication protocols, mobile app interfaces, system diagnostics and updates. - 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. - 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 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. - Proficiency in C, and working familiarity with Python. Rust knowledge is nice to have. - Experience working with IP stack protocols: Ethernet, WiFi, TCP, UDP, HTTPS, etc - Working knowledge of Bluetooth/BLE. - Experience working with WiFi networks and Espressif ecosystem - 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: - Competitive salary and stock options package - Private Medical Insurance scheme through BUPA (medical history disregarded) - A wellbeing and lifestyle benefits plan through Medicash - 5% employer contributions pension matching - A budget for work related training of £1,000 per financial year and an allowance of 4 training days - Cycle To Work scheme and Workplace Nursery benefit - Access to Spill - Mental Health Support platform - Enhanced Maternity + Paternity Pay - 25 days annual holiday entitlement + 8 Bank Holidays - Flexible start and finish times, fully remote working or hybrid depending on preferences 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. ## 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 - [Senior Supply Quality Engineer](https://feeny.ai/job/senior-supply-quality-engineer-lunar-energy-mountain-view-4s34br1y8t4a) — Mountain View, CA - [Technical Program Manager Intern, Hardware Engineering](https://feeny.ai/job/technical-program-manager-intern-hardware-engineering-lunar-energy-mountain-view-xcmyccw7wr0c) — Mountain View, CA - [Corporate Development Manager](https://feeny.ai/job/corporate-development-manager-lunar-energy-united-kingdom-2ek5jmnrw6hp) — United Kingdom - [Senior Firmware Engineer - Communications](https://feeny.ai/job/senior-firmware-engineer-communications-lunar-energy-mountain-view-6a760gcrw8nd) — Mountain View, CA - [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 Engineer](https://feeny.ai/job/senior-electrical-engineer-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