Embedded / Firmware Engineer — Wearables

Company Description

At  ONLYQ , we’re reimagining what a health wearable can be.

No screens.

No noise.

Just  pure physiological intelligence , wrapped in a design that feels invisible but works continuously for you.

We’re building the next-generation  screenless health band  powered by :

Clinical-grade ECG & PPG

Bioimpedance + Temperature sensing

IMU fusion

AI-driven biomarker analytics

Women’s health & autonomic intelligence

Preventive, personalised insights

Our mission :

A Lab on Hand — for every human.

ONLYQ is a  self-funded initiative  by the founders of Cymetree Projects LLP, giving us the freedom to innovate with long-term vision, zero bureaucracy, and global ambition.

And now, we’re assembling our core team.

Role Description & Qualification -

Firmware Development

Develop, optimize, and maintain firmware on  Nordic nRF52 / nRF54 Series (BLE 5.2 / 5.4)

Implement ultra-low-power firmware architecture (sleep modes, RTC, timers)

Build and optimize firmware for  real-time physiological signal acquisition  (ECG, PPG, BioZ, Temperature, IMU)

Sensor Integration

Integrate and calibrate sensors such as :

AS7058 (PPG + ECG AFE)

AFE4950 (BioZ + ECG)

MLX90632 (Temperature)

AD5940 (Bioimpedance)

Bosch BHI380 (IMU Fusion)

BME688 (Environmental sensing)

Communication & Protocols

Implement BLE services (Nordic SoftDevice)

Create custom BLE GATT profiles

Support OTA updates (DFU)

System Architecture & Reliability

Develop robust state machines, task schedulers, and interrupt-driven firmware

Optimize for power, latency, and memory footprint

Debug using JTAG / SWD, logic analyzers, and oscilloscopes

Testing & Validation

Unit testing, sensor calibration routines, and quality benchmarking

Work with hardware team for DVT / PVT / MP testing

Educational Qualifications

Minimum : B.E. / B.Tech  in :

Electronics Engineering

Electronics & Telecommunication (E&TC)

Electrical Engineering

Instrumentation Engineering

Computer Engineering

Biomedical Engineering (with strong embedded exposure)

Preferred : M.E. / M.Tech  in :

Embedded Systems

VLSI

Electronics Design

Biomedical Instrumentation

(OR equivalent specialization)

Additional Preferred Certifications :

Embedded Systems diploma / certificate (CDAC, NIIT, Coursera, etc.)

RTOS / Embedded Linux courses

BLE firmware development certifications

Core Skills

Excellent command of  C / C++  for embedded systems

Experience with  ARM Cortex-M  microcontrollers

Strong understanding of  I2C, SPI, UART , DMA, interrupts

Experience with  Nordic nRF SDK / Zephyr OS

Power-optimized firmware design

Sensor integration & real-time data streaming

Wearable-Specific Required Skills

Experience with  PPG, ECG, IMU, BioZ  sensor integration

Real-time signal acquisition and filtering

Noise reduction + motion compensation knowledge

Experience with low-power wireless protocols

Preferred Skills (Bonus)

Experience in  medical / wellness devices

Understanding of physiological signal processing (ECG / PPG / HRV basics)

Experience with  RTOS (FreeRTOS / Zephyr)

Mobile app / BLE debugging tools (nRF Connect, LightBlue)

Experience working with manufacturing / ODM teams (China / Taiwan / India)