About Lumysi
Lumysi is a US-based wearable technology startup developing a jewelry-inspired health and fitness bracelet.
Our screenless wearable continuously tracks health, activity, sleep, recovery, and women’s health metrics while maintaining the appearance and comfort of a premium accessory.
The product combines biometric sensors, ultra-low-power embedded systems, Bluetooth connectivity, interchangeable straps, and a mobile application that transforms health data into personalized insights.
We are expanding our engineering team and looking for an experienced Embedded Firmware Engineer to take ownership of the firmware that powers the Lumysi wearable.

The Role
As an Embedded Firmware Engineer, you will develop, optimize, and maintain the embedded software running on a battery-powered wearable device.
This is a firmware-focused position. You will work primarily with C and C++, Bluetooth Low Energy, Nordic Semiconductor and Espressif microcontrollers, biometric sensors, communication protocols, power management, and real-time operating systems.




You will collaborate with our hardware engineers, mobile development team, sensor suppliers, and manufacturing partners to ensure reliable performance from prototype development through production.
The adecuado candidate has strong low-level programming experience and understands the challenges of building stable, power-efficient firmware for connected, battery-powered devices.

Responsabilities
Develop and maintain embedded firmware in C and C++.
Work with Nordic Semiconductor and Espressif microcontrollers.
Develop and maintain low-level drivers for sensors and peripherals.
Integrate biometric, motion, temperature, and other wearable sensors.
Implement communication protocols including I2C, SPI, UART, and BLE.
Develop and maintain Bluetooth Low Energy connectivity.
Optimize firmware for ultra-low-power operation and extended battery life.
Implement power states, sleep modes, wake-up events, and sensor sampling strategies.
Wor

📌 Embedded Firmware Engineer, BLE (México)
🏢 Lumysi
📍 México