# Firmware Engineer / Embedded Systems Engineer – Medical Devices

INDQ is looking for a Firmware / Embedded Systems Engineer to develop reliable, production-ready firmware for medical devices and advanced engineering products.

The ideal candidate should have strong hands-on experience with ESP32, STM32, Nordic Semiconductor platforms, sensor interfacing, communication protocols, real-time embedded systems, and signal processing. The role will involve working closely with hardware, biomedical, mechanical, and product-development teams to convert device requirements into robust embedded solutions.

The candidate should be comfortable working from the sensor level to the complete device level — including peripheral interfacing, communication, data acquisition, signal processing, control algorithms, debugging, validation, and firmware documentation.

## Key Responsibilities

Develop embedded firmware for ESP32, STM32, Nordic nRF52/nRF53/nRF54 and similar microcontrollers.

Develop firmware for medical and healthcare devices involving sensors, actuators, displays, communication modules, and data acquisition systems.

Interface and acquire data from various sensors such as:

ECG / biopotential sensors

PPG / SpO₂ sensors

Temperature sensors

Pressure sensors

IMUs

Load cells

Optical sensors

Analog front ends (AFEs)

Other biomedical and industrial sensors

Implement signal conditioning and digital signal-processing algorithms for noisy physiological and sensor data.

Develop algorithms for filtering, noise reduction, feature extraction, signal quality assessment, and parameter estimation.

Work with ADCs, DACs, timers, PWM, interrupts, DMA, GPIO, RTC, watchdogs, and low-power peripherals.

Develop and debug communication interfaces including: UART, SPI, I²C, RS-232 / RS-485, CAN / CAN-FD, USB, BLE, Wi-Fi, Ethernet

Develop BLE applications and profiles using Nordic/Zephyr or equivalent platforms.

Interface embedded systems with mobile applications, PCs, cloud platforms, and external medical equipment where required.

Implement real-time control and state-machine-based firmware.

Develop bootloaders, firmware update mechanisms, and OTA updates where required.

Implement data logging, memory management,



EEPROM/Flash storage, and configuration management.

Perform hardware bring-up and board-level debugging.

Debug firmware using oscilloscopes, logic analyzers, multimeters, JTAG/SWD debuggers, and other laboratory equipment.

Analyze communication buses and troubleshoot hardware–firmware integration issues.

Optimize firmware for performance, memory usage, power consumption, and reliability.

Develop firmware with appropriate fault handling, watchdog mechanisms, error detection, and recovery mechanisms.

Participate in firmware verification, validation, and system-level testing.

Maintain firmware architecture, source-code documentation, interface specifications, test procedures, and technical documentation.

Work within a structured medical-device product-development and quality-management environment.

Experience with FreeRTOS, Zephyr RTOS, or other RTOS environments is highly desirable.

### Programming

Strong proficiency in Embedded C

Good knowledge of C++

Pointers, structures, unions, bit manipulation, memory management

Interrupt-driven programming

DMA-based data acquisition

Timers and peripheral programming

State machines

Multithreading / RTOS concepts

Memory-constrained embedded programming

Version control using Git The candidate should be able to read a communication protocol specification and implement/debug the protocol at firmware level.

Signal Processing

This is an key part of the role.

The candidate should have practical understanding of:

Digital signal processing

Sampling theory

Nyquist theorem

Digital filtering

Moving-average filters

FIR / IIR filters

Low-pass / high-pass / band-pass filtering

Notch filtering

Noise reduction

Baseline removal

Signal normalization

FFT / frequency-domain analysis

Peak detection

Feature extraction

Signal quality assessment

Sensor fusion





Real-time signal processing on microcontrollers

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Knowledge of the following is an advantage:

Medical-device firmware development

Physiological signal acquisition

ECG / PPG / SpO₂

Patient monitoring systems

Wearable medical devices

Diagnostic devices

Therapeutic devices

Sensor calibration

Measurement accuracy and repeatability

Firmware verification and validation

Risk-based development

IEC 62304

IEC 60601

ISO 13485

ISO 14971

Software lifecycle documentation

Design inputs / outputs

Verification and validation

## What We Are Looking For

We are looking for someone who can independently take ownership of firmware development, rather than someone who only writes basic microcontroller code.

The ideal candidate should be able to:

Understand requirement → select architecture → interface hardware → acquire sensor data → process signals → implement algorithms → establish communication → debug → validate → document → release production firmware.

Strong hands-on problem-solving ability is more important than knowing a large number of platforms theoretically.

## Experience

Recommended experience: 2–5+ years in embedded/firmware development.

Freshers with exceptional hands-on experience in embedded systems, biomedical instrumentation, signal processing, and significant personal/academic projects may also be considered.

## Education

Preferred backgrounds

B.E. / B.Tech – Electronics & Communication Engineering

B.E. / B.Tech – Electrical / Electronics Engineering

B.E. / B.Tech – Biomedical Engineering

B.E. / B.Tech – Instrumentation Engineering

- M.E. / M.Tech in relevant fields

Equivalent practical experience will also be considered.

## Key Skills / Keywords

Embedded C | C++ | ESP32 | STM32 | Nordic nRF52/nRF53/nRF54 | ARM Cortex-M | FreeRTOS | Zephyr | UART | SPI | I²C | RS-485 | CAN | USB | BLE | Wi-Fi | TCP/IP | MQTT | ADC | DAC | DMA | RTOS | Sensor Interfacing | Biomedical Sensors | Signal Processing | DSP | FIR | IIR | FFT | ECG | PPG | SpO₂ | IMU | Data Acquisition | Hardware Debugging | JTAG | SWD | Git | Firmware Validation | Medical Devices

📌 Firmware Engineer (Visakhapatnam)
🏢 INDQ
📍 Visakhapatnam