Senior Firmware Engineer — Wireless Energy & IoT

Lunar Energy; San Francisco (CA); On-site; USD 120,000 - 175,000; Full time

Benefits offered by this job

Medical Insurance

Dental Insurance

Vision Insurance

PTO & Holidays

401(k) Plan

Parental Leave

EV charging

Job summary

Lunar Energy seeks a Sr Firmware Engineer to own the firmware development lifecycle for home energy products. You will design, implement, test, and optimize firmware across power electronics, system behaviors, and interfaces, working with a cross-functional team to deliver reliable, scalable solutions.

Ideal candidates bring 5+ years of firmware experience, ESP-IDF know-how, and strong C/C++ skills, along with proficiency in network protocols and lab testing tools.

Qualifications

• Degree in computer engineering or related field.
• 5+ years delivering firmware for new products as part of a team.
• Experience with CAN and Protocol Buffers.
• Espressif ESP-IDF product development experience.
• Embedded Ethernet stacks and TCP/IP knowledge.

Responsibilities

• Design firmware for home energy product components including power electronics controls and system diagnostics.
• Collaborate with cross-functional teams to refine features and ensure reliability at scale.
• Develop tests, simulations, and validation plans to verify firmware behavior.
• Support manufacturing with automation features and partner integration.

Skills

Wireless mesh networking

C/C++ programming

Embedded software development

Cross-functional collaboration

Diagnostics & test skills

Education

Bachelor's in computer engineering or related field

Tools

ESP-IDF

TCP/IP / BSD Sockets

Oscilloscopes & Logic Analyzers

cmake

Python

Job description

Lunar Energy seeks a Sr Firmware Engineer to own the firmware development lifecycle for home energy products. You will design, implement, test, and optimize firmware across power electronics, system behaviors, and interfaces, working with a cross-functional team to deliver reliable, scalable solutions.

Ideal candidates bring 5+ years of firmware experience, ESP-IDF know-how, and strong C/C++ skills, along with proficiency in network protocols and lab testing tools.