Senior Embedded Software Engineer

Luna Health•San Diego, CA

1d•Hybrid

About The Position

Luna Health is a venture-backed medical device startup developing insulin automation products intended to make life with insulin-requiring diabetes simpler and safer. Its product combines a small patch pump with a closed-loop insulin dosing algorithm to automatically adjust insulin doses overnight. The product has reached clinical studies, and Luna is preparing for commercial launch. The Senior Embedded Software Engineer will be a hands-on technical contributor who owns firmware for Luna’s wearable patch pump, from low-level drivers through Bluetooth communication with the mobile application. The role focuses on building firmware that is reliable, power-efficient, and safe for real-world use. Working within a small team, the engineer will collaborate with hardware, mobile, and systems engineers on board bring-up, hardware-software debugging, and safe device behavior. This is a hybrid, on-site role requiring attendance three days per week. Applicants must live within a reasonable commuting distance of Luna Health’s San Diego, California site.

Requirements

Bachelor’s degree in Computer Engineering, Electrical Engineering, Computer Science, or a related technical field, or equivalent experience.
5–8+ years of embedded software or firmware development experience on shipped products.
Track record of owning firmware features or subsystems end-to-end.
Strong proficiency in C and C++ for resource-constrained microcontrollers.
Experience with RTOS or bare-metal environments.
Hands-on experience with low-power embedded design.
Ability to read schematics and use lab equipment to debug at the hardware-software boundary.
Familiarity with modern development practices, including Git-based workflows, code reviews, and CI/CD.
Strong ownership and accountability, with the ability to work independently in a fast-moving, ambiguous environment.
Willingness to take on varied tasks and help where the team needs it.
Attention to detail, particularly in safety-critical device behavior.
Clear communication across engineering, product, quality, and regulatory teams.
Ability to meet the role’s physical demands, including handling small components and using hand tools, working in laboratory, production, and controlled-environment spaces, and lifting and moving up to 25 lbs.

Nice To Haves

Experience with motor control.
Experience with battery-powered wearables.
Experience with Bluetooth Low Energy.
Experience with Python test automation.
Experience with secure firmware updates (OTA).
Experience in medical devices or other regulated environments, including familiarity with IEC 62304 or ISO 14971.

Responsibilities

Design, implement, and own embedded firmware for the wearable medical device, from requirements through release.
Develop device drivers and interfaces for sensors, motors, power management, and peripherals including SPI, I2C, UART, ADC, and GPIO.
Use JTAG for debugging and programming.
Implement and maintain Bluetooth Low Energy communication between the device and the mobile application.
Optimize firmware for low power consumption, memory constraints, and reliability.
Partner with electrical engineers on board bring-up, hardware debugging, and design trade-offs.
Work with mobile and cloud engineers to define and maintain device communication protocols and data flows.
Debug and resolve issues across firmware, hardware, and application layers using oscilloscopes, logic analyzers, and debuggers.
Build test tools, scripts, and fixtures to support development, verification, and manufacturing.
Implement safety-critical features, including fault detection, alarms, and fail-safe behavior.
Set standards for code quality, unit testing, static analysis, and code reviews.
Contribute to design control documentation, software risk analysis, and verification activities for a regulated medical device.
Support release cycles, including debugging and stabilization.