Winter 2025
Embedded Software Engineer
Posted on 9/3/2025
Lunar Energy
201-500 employees
Modular energy storage system for homes
Compensation Overview
$28 - $50/hr
Mountain View, CA, USA
In Person
 Software Engineering (1) |
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- Collaborate with other disciplines across the company to refine and improve our understanding of how our products can create the greatest impact, get to market quickly, and operate reliably for our customers.
- Contribute to creating 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 through back-of-the-envelope calculations, building simulations, and designing validation tests.
- Build and deploy software tools, processes, and metrics.
- Perform board bring-up and hardware design validation.
- Design firmware software for our home energy product components, including Power electronics controls, System-level behaviors and optimization, System diagnostics and updates, RF and powerline communication protocols, Control algorithms, Installation automation features.
- Optimize manufacturing by designing automation support functionality and by supporting our features within our manufacturing partners.
- Completed coursework in Computer Science, Electrical Engineering, Computer Engineering, or a related field
- Experience in software and/or firmware development
- C/Python coding skills
- Experience with board /chip bring-up
- Ability to explain and communicate about technical concepts with engineers in a variety of fields
- Strong interest in working in a startup environment with high-impact projects
Lunar Energy builds a modular residential energy storage system that stores solar power for use during peak hours or outages. The Lunar System is expandable with additional modules and works with home solar installations, controlled via a smartphone app that shows usage and storage data. It differentiates itself by its scalable brick-by-brick design and by partnering with solar installers to offer the system as part of their packages. The goal is to help homeowners save on energy bills, gain energy independence, and maintain power reliability.
Company Size
201-500
Company Stage
Series D
Total Funding
$532M
Headquarters
Mountain View, California
Founded
2020
Simplify's Take
What believers are saying
- VPP customers earned $464 annually plus $338 additional savings versus standard mode.
- Octopus Energy partnership validates battery-as-service model scaling beyond California into Texas.
- Manufacturing scaling to 100,000 units by 2028 supports supply chain resilience.
What critics are saying
- Base Power's $1 billion funding enables aggressive VPP expansion stealing utility partnerships.
- Tesla Powerwall dominates with superior brand loyalty and nationwide installer network advantage.
- Trump administration gutted IRA provisions eliminate Section 48E tax credits, spiking costs.
What makes Lunar Energy unique
- Integrated hardware-software platform manages 650 MW distributed energy across multiple regions.
- AI-driven Gridshare platform adopted by California Community Choice Aggregators for recurring revenue.
- Domestic manufacturing in Georgia and Washington qualifies for Section 48E tax credits.
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Benefits
Health Insurance
Dental Insurance
Vision Insurance
Unlimited Paid Time Off
401(k) Retirement Plan
401(k) Company Match
Paid Parental Leave
Phone/Internet Stipend
Wellness Program
Growth & Insights and Company News
6 month growth
↓ -1%1 year growth
↓ -2%2 year growth
↓ -1%Lunar Energy secures $232 million to expand home battery systems and VPP software. The Mountain View-based ClimateTech firm will use the funding to expand home battery deployments and scale AI-driven virtual power plant software nationwide. Mountain View - based Lunar Energy has secured a total of $232 million across its Series C and Series D funding rounds to accelerate the deployment of residential battery systems and scale its AI-powered Virtual Power Plant (VPP) software. The latest $102 million Series D round was oversubscribed and led by B Capital and Prelude Ventures, following an earlier, undisclosed $130 million Series C round led by Activate Capital. The combined funding will support Lunar's national expansion after a strong rollout in California and further development of its distributed energy software platform, Lunar Gridshare. The platform currently operates some of the largest VPP programs in the United States, enabling utilities and energy providers to manage distributed energy resources more efficiently. Additional investors participating across both rounds include DCVC, Piva Capital, Leitmotif, Sunrun, Itochu Corporation, and Q Capital Partners. Founded on the belief that the energy transition requires tightly integrated hardware and software, Lunar Energy develops home battery systems paired with AI-driven optimization tools. The company has already deployed thousands of systems and manages approximately 650 MW of distributed devices across multiple regions globally. Commenting on the funding, founder and CEO Kunal Girotra said the investment reinforces Lunar's long-held view that neither hardware nor software alone can solve electrification challenges. He added that the new capital will help homeowners transition to cleaner energy while actively supporting a more resilient electricity grid. Lunar's Gridshare platform is currently used by Sunrun to manage distributed power plants across several U.S. markets, including New England, Hawaii, and Puerto Rico. In California, Community Choice Aggregators are using the platform to design and operate new distributed energy programs, while utilities and energy retailers in Europe and Asia are also partnering with Lunar to advance grid modernization. For homeowners, Lunar's AI-led approach has translated into measurable financial benefits. In 2025, customers participating in VPP programs earned an average of $464, along with additional savings of $338 compared to conventional battery usage. Lunar's systems are designed in California and assembled in Georgia and Washington, supporting domestic manufacturing and eligibility for clean energy tax incentives. Investors highlighted Lunar's integrated model as a key differentiator in a rapidly evolving energy storage market. B Capital's Jeff Johnson said the company's ability to combine intelligent battery hardware with advanced optimization software positions it as a critical player in strengthening grid resilience and improving household energy affordability. Prelude Ventures Managing Director Tim Woodward noted that Lunar's system architecture and software intelligence have driven strong market traction, while Activate Capital Managing Partner Raj Atluru emphasized the growing importance of distributed storage solutions amid rising power demand, aging infrastructure, and climate-related grid disruptions.
The Silicon Valley startup wants to enter new markets, like Texas, and enroll more customers in virtual power plants that make the grid more reliable and…
VPP software provider Lunar Energy raises $232 million. Lunar will use the funding to expand its products and scale its Gridshare platform Integrated home battery systems and virtual power plant (VPP) software provider, Lunar Energy, has raised $102 million in a Series D funding round led by B Capital and Prelude Ventures. Lunar Energy will utilize the funding to expand its hardware and software products. It will also use the funding to scale its AI-driven distributed power software platform, Lunar Gridshare. Lunar Energy said this platform is managing major distributed resources/VPP programs in the U.S. The company had earlier raised $130 million in an unannounced Series C funding round led by Activate Capital. Funding from these two rounds totaled $232 million. These funding rounds also included participation from DCVC, Piva Capital, Leitmotif, Sunrun, Itochu Corporation, and Q Capital Partners. Lunar Energy is managing 650 MW of distributed energy devices. The company's major clients include residential solar and battery storage provider Sunrun, which utilizes the Gridshare platform for its distributed power plants in multiple markets, such as New England, Hawaii, and Puerto Rico. The platform is also used by non-profit electricity procurement entity, California Community Choice Aggregators, to develop and deploy new distributed power programs across the state. Lunar Energy's clients also include utilities and retailers in Europe and Asia. The company said its VPP earned customers an average of $464 per customer. It also claimed that the software provided customers with an additional $338 in savings compared to a standard home battery operating mode. Venture capital investment in energy storage gained momentum in 2025, rising 30% year over year to $4.8 billion across 75 deals, even as total corporate funding for the sector declined 19% to $16.2 billion, according to Mercom Capital Group's Annual and Q4 2025 Funding and M&A Report for Energy Storage. Overall corporate funding totaled $16.2 billion across 119 deals in 2025, down from $19.9 billion raised through 116 deals in 2024. Despite the decline in total capital raised, deal activity increased 3% during the year, indicating continued investor engagement in the sector.
Lunar Energy raises $232M to deploy home batteries that prop up the grid. Forget EVs - stationary batteries are getting all the buzz, and investment, in the U.S. these days. Startup Lunar Energy is the latest example. The six-year-old company, which builds battery packs for homeowners in California, Georgia, and Washington, said Wednesday it has completed two large funding rounds. The startup shared it raised a previously unannounced $130 million Series C and a $102 million Series D. The Series C was led by Activate Capital, while the Series D was led by B Capital and Prelude Ventures. The startup plans to use the funds to scale manufacturing to 20,000 units by the end of this year before rampaging to 100,000 by the end of 2028. In total, Lunar has raised more than $500 million from investors. Stationary storage has become a bright spot for battery manufacturers that have been subject to policy whiplash after the Trump administration and GOP-controlled Congress gutted large parts of the Inflation Reduction Act, which had incentivized companies to build batteries in the U.S. to supply the automotive industry. As the grid strains under the weight of an increasingly electrified economy - along with the boom in data center demand - grid-connected batteries have become one of the most versatile ways to boost its resiliency. Lunar can call on its fleet of batteries, which come in 15 kilowatt-hour and 30 kilowatt-hour modules, to deliver juice to the grid when needed. It's virtual power plant (VPP) software can also control EV chargers and appliances, allowing it to both supply electrons while tamping down demand. Such VPPs are expected to be able to replace costly and polluting peaking power plants in a matter of years. Competition in the space has been heating up lately. In October, Base Power raised $1 billion, less than six months after raising a $200 million round for its residential battery-based VPP. Tesla operates its own Powerwall-based VPP, too.
Oversubscribed Series D financing of $102 million led by B Capital and Prelude Ventures follows a previously unannounced $130 million Series C led by...