Senior Embedded Software Engineer

Luna Health•San Diego, CA

3d•$160,000 - $190,000•Hybrid

About The Position

Luna Health is a venture-backed medical device startup focused on making life with insulin-requiring diabetes simpler and safer through innovative hardware and software. Its product combines a patch pump with a closed-loop insulin-dosing algorithm to automatically adjust doses overnight. The Senior Embedded Software Engineer will be a hands-on technical contributor responsible for firmware for Luna’s wearable patch pump, from low-level drivers through the Bluetooth connection to the mobile application. The product has reached clinical studies, and this role will help develop reliable, power-efficient, safe firmware as the company moves toward commercial launch. The engineer will work closely with hardware, mobile, and systems engineers on board bring-up, hardware-software integration, debugging, and safe device behavior. This is a hybrid, on-site role three days per week. The employee 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, such as ARM Cortex-M or Nordic nRF.
Experience with RTOS or bare-metal environments, such as Zephyr or FreeRTOS.
Hands-on experience with low-power embedded design.
Comfortable reading schematics and using 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 operate independently in a fast-moving, ambiguous environment.
Willingness to take on varied responsibilities and help wherever the team needs support.
Attention to detail, especially in safety-critical device behavior.
Clear communication across engineering, product, quality, and regulatory teams.
Must live within a reasonable commuting distance of the Luna Health site in San Diego, California.

Nice To Haves

Experience with motor control.
Experience with battery-powered wearables.
Bluetooth Low Energy experience.
Python test automation experience.
Experience with secure firmware updates (OTA).
Experience in medical devices or other regulated environments, such as 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 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.