Full-Time

Systems Integration and Development Tools Engineer

Posted on 8/21/2025

Lunar Energy

Lunar Energy

201-500 employees

Modular energy storage system for homes

Compensation Overview

$120k - $190k/yr

Mountain View, CA, USA

In Person

Category
Hardware Engineering (2)
,
Required Skills
Rust
Python
Grafana
Software Testing
AWS
Jenkins
C/C++
Linux/Unix
Requirements
  • BS in CS, Electrical Engineering, or equivalent
  • Strong skills in Python related to scripts, control of devices, etc.
  • Fluent in scripting/automation using Python
  • Experience with hardware in the loop testing
  • Ability to read electrical schematics and embedded C code is a benefit
  • Experience with CAN, RF, and PLC communications desired
  • Experience with BMS, batteries, and power electronics desired
  • Knowledge of Windows, Mac and Linux platform experience
  • Good understanding of C programming language in the interests of code generation tool development
  • Rust programming experience is a benefit
  • At least a minimum understanding of CI/CD pipeline and data analysis tools (Jenkins, AWS, Grafana)
  • Demonstrated excellence in debugging complicated system-level behavior at the crossroads of electrical engineering and firmware
  • Outstanding written and verbal communication and the ability to smoothly work cross cross-functional
  • A strong sense of ownership and responsibility
  • Put together new hardware and firmware for the first time
  • Solve integration problems and create automated system-level regression testing
  • Work side by side with counterparts in EE, ME, FW, and Systems to release high-quality features with extensive regression testing
  • Ensure the system meets its requirements and this behavior is robust across all corner cases
  • Create test plans and perform root cause analysis
  • Define and implement hardware in the loop testing
  • Define and develop scripts to autogenerate C /Rust code
  • Develop scripts & GUI (Python /QT) tools for internal use
Responsibilities
  • Put together new hardware and firmware for the first time
  • Solve integration problems and create automated system-level regression testing
  • Work side by side with your counterparts in EE, ME, FW, and Systems to release high-quality features with extensive regression testing
  • Ensure the system meets its requirements and this behavior is robust across all corner cases
  • Create test plans and perform root cause analysis
  • Define and implement hardware in the loop testing
  • Define and develop scripts to autogenerate C /Rust code.
  • Develop scripts & GUI (Python /QT) tools for internal use.
Desired Qualifications
  • Rust programming experience is a benefit
  • Experience with CAN, RF, and PLC communications desired
  • Experience with BMS, batteries, and power electronics desired
  • BS in CS, EE, or equivalent
  • A minimum understanding of CI/CD pipeline and data analysis tools (Jenkins, AWS, Grafana)
  • Windows, Mac and Linux platform experience
  • Fluent in scripting/automation using Python
  • Strong skills in Python related to scripts, control of devices etc.
  • Good understanding of C programming language in the interests of code generation tool development
  • Demonstrated excellence in debugging complicated system-level behavior at the crossroads of electrical engineering and firmware
  • Outstanding written and verbal communication and the ability to smoothly work cross cross-functional
  • A strong sense of ownership and responsibility
  • Ability to read electrical schematics and embedded C code is a benefit
  • Experience with hardware in the loop testing

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 Jobs

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.

Help us improve and share your feedback! Did you find this helpful?

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

Headcount

6 month growth

-1%

1 year growth

-2%

2 year growth

-1%
RealtyNXT
Feb 10th, 2026
Lunar Energy Secures $232 Million To Expand Home Battery Systems And VPP Software

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.

Canary Media
Feb 5th, 2026
Lunar Energy lands $232M to boost smart home batteries

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…

Mercom India
Feb 5th, 2026
VPP Software Provider Lunar Energy Raises $232 Million

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.

Rocketnews
Feb 4th, 2026
Lunar Energy raises $232M to deploy home batteries that prop up the grid

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.

GlobeNewswire
Feb 4th, 2026
Lunar Energy raises $232 million to scale home battery deployments and AI-powered VPP software to meet surging demand for affordable electricity

Oversubscribed Series D financing of $102 million led by B Capital and Prelude Ventures follows a previously unannounced $130 million Series C led by...

INACTIVE