Consultant - Firmware Developer

Flexing It®; Bengaluru; Hybrid; INR 900,000 - 1,500,000; Full time

Job summary

Flexing It is seeking an experienced Consultant - Firmware Developer to design and develop IoT-enabled home energy management products with embedded firmware, Wi‑Fi connectivity, device protocols and Azure IoT Hub integration.

You will contribute across hardware, software and cloud teams on a Bengaluru‑based 6‑month hybrid engagement, delivering secure OTA firmware upgrades and robust device‑to‑cloud communication.

Qualifications

• Experience in designing and developing embedded firmware for IoT devices.
• Proficiency with MCUs/SoCs (STM32, ESP32, Nordic, NXP, Silicon Labs).
• Experience with RTOS such as FreeRTOS, ThreadX/Azure RTOS, or Zephyr.
• Ability to develop drivers, HAL/BSP, bootloaders, and sensor interfaces.
• Strong Wi‑Fi provisioning, onboarding, and connectivity troubleshooting.
• Familiarity with MQTT, HTTP/HTTPS, TLS, TCP/IP, UART, SPI, I2C, CAN/RS-485.
• Exposure to Azure IoT Hub and device provisioning is a plus.

Responsibilities

• Design, develop, integrate and maintain production‑grade embedded firmware in C/C++.
• Develop firmware for MCUs/SoCs and portable platforms.
• Work with RTOS‑based systems (FreeRTOS, ThreadX/Azure RTOS, Zephyr).
• Develop device drivers, bootloaders, and sensor interfaces; perform low‑level debugging.

Skills

C/C++

Embedded firmware

Wi-Fi connectivity

RTOS: FreeRTOS

Device drivers

MQTT

Tools

STM32

ESP32

Nordic nRF

CAN / RS-485

JTAG/SWD

Azure IoT Hub

Job description

Our client, a leading global specialist in energy management and automation, is seeking an experienced Consultant - Firmware Developer to help design and develop IoT-enabled home energy management and automation products, focusing on embedded firmware, Wi-Fi connectivity, device protocols, secure cloud integration and Azure IoT Hub.

Key Responsibilities

Firmware Development

• Design, develop, integrate and maintain production-grade embedded firmware using C/C++.
• Develop firmware for MCUs/SoCs, preferably platforms such as STM32, ESP32, Nordic nRF, NXP, Silicon Labs, Renesas or similar.
• Work with RTOS-based embedded systems, preferably FreeRTOS, ThreadX/Azure RTOS, Zephyr or equivalent.
• Develop and optimize device drivers, HAL/BSP components, bootloaders, peripheral interfaces and application firmware.
• Perform board bring-up, hardware/firmware integration and low-level debugging
  using JTAG/SWD, oscilloscopes, logic analyzers and protocol analyzers.
  Home & Energy Products
• Hands‑on firmware experience with one or more connected product categories:
  o Smart switches and relays
  o Dimmers and lighting controls
  o Smart plugs
  o Fan controllers
  o Energy monitoring/metering devices
  o Home automation controllers
  o IoT gateways / edge devices
• Understanding of AC load control, relays, triacs/MOSFETs, dimming concepts, zero‑cross detection, energy metering and power measurement is highly desirable.
• Experience integrating metering ICs/sensors and handling measurements such as voltage, current, power, energy, power factor and frequency is an advantage.
• Strong hands‑on experience with Wi‑Fi, including provisioning/onboarding, network
  reconnection, credential management and connectivity troubleshooting.
• Experience with embedded communication protocols such as:
  o MQTT
  o HTTP/HTTPS
  o TCP/IP
  o TLS
  o UART
  o SPI
  o I²C
  o CAN / RS-485 where applicable
• Knowledge of BACnet/IP or BACnet MS/TP is desirable, particularly for gateway or
  building/home integration.
• Exposure to BLE, Zigbee, Thread and Matter would be a strong advantage.
• Hands‑on experience connecting embedded/IoT devices with Azure IoT Hub or equivalent cloud IoT platforms.
• Experience implementing:
  o Device provisioning and authentication
  o MQTT-based telemetry
  o Device-to-cloud and cloud-to-device messaging
  o Device twins / desired and reported properties
  o Commands and remote device management
  o Firmware/device configuration management
  o Connectivity recovery and offline handling
• Familiarity with Azure Device Provisioning Service (DPS) is desirable.
  OTA & Device Lifecycle
• Design and implement reliable OTA firmware upgrade mechanisms.
• Implement firmware validation, rollback/recovery strategies and fail‑safe upgrade mechanisms.
• Experience with bootloaders, firmware images, flash partitioning and firmware version management.
• Implement embedded security practices including:
  o Secure boot
  o Signed firmware
  o TLS-based communication
  o Certificate/key management
  o Device identity
  o Secure firmware updates
  o Protection of credentials and sensitive information
• Understanding of IoT threat models and secure product‑development practices.
• Perform unit testing, integration testing, system testing and firmware/hardware
  debugging.
• Investigate field issues using device logs, traces and telemetry and drive root‑cause
  analysis.
• Design firmware for 24x7 connected-device operation, including watchdogs, brown‑out recovery, connectivity recovery, memory/resource management and fault handling.
• Work closely with hardware, mobile-app, cloud, system architecture, cybersecurity, validation and product teams.
• NOTE:
  Duration: 6 Months
  Location: Bengaluru
  Capacity: Full time, Hybrid (3 days from office and 2 days home)