Home Automation Protocol Embedded Developer

14 hours ago

Bengaluru, Karnataka, India Confio Technologies Full time

Role Overview

You will architect, develop, and maintain embedded firmware for home automation devices that communicate over Zigbee, Z-Wave, RS485/Modbus, BLE, KNX, and IP-based protocols. This role requires deep protocol knowledge, strong microcontroller expertise, and the ability to build stable production firmware for commercial smart home products.

This is not a basic embedded role. Only apply if you have real experience implementing at least one home automation protocol end-to-end.

Key Responsibilities / Duties

Protocol Development

  • Implement and optimize firmware for:
  • Zigbee 3.0 (clusters, ZCL, provisioning, binding)
  • Z-Wave (serial API, command classes, network inclusion/exclusion)
  • RS485/Modbus (RTU/ASCII, polling, CRC, addressing)
  • KNX (TP1/IP preferred)
  • MQTT/IP communication
  • Build device descriptors, command classes, attribute handling, and network management logic.
  • Handle commissioning, configuration, OTA updates, and device diagnostics.

Embedded Firmware Development

  • Develop C/C++ firmware for microcontrollers like STM32, EFR32, Nordic nRF52, TI CC26xx, ESP32, NXP, etc.
  • Work on drivers for UART/SPI/I2C, timers, ADCs, GPIOs, PWM, DMA.
  • Implement power optimization, watchdogs, bootloaders, and RTOS-based tasks (FreeRTOS preferred).

Board Bring-Up & System Integration

  • Work with hardware teams for PCB bring-up, pin configuration, and sensor/peripheral integration.
  • Coordinate with gateway/app/cloud teams for seamless device onboarding and field operation.
  • Validate RF and wired communication performance.

Testing & Validation

  • Perform protocol sniffing using tools like Ubiqua, Simplicity Studio, Z-Wave PC Controller, logic analyzers, Saleae, oscilloscopes.
  • Conduct interoperability testing across different controller ecosystems (SmartThings, Home Assistant, Amazon, etc.).
  • Execute stress tests, long-duration communication tests, and EMI/EMC robustness checks.

Documentation & Release

  • Create protocol documents, register maps, API definitions, configuration sheets, and release notes.
  • Support certification processes (Zigbee, Z-Wave, KNX, BIS if applicable).

Required Skills & Qualifications

  • Strong C/C++ embedded coding and debugging.
  • Must have hands-on development experience in at least one protocol (Zigbee/Z-Wave/RS485/Modbus/KNX).
  • Deep understanding of embedded architecture, memory management, timing, concurrency.
  • Experience with RTOS (FreeRTOS or similar).
  • Proficient with hardware debugging tools (SWD/JTAG, logic analyzer, RF sniffers).
  • Strong grasp of CRC, packet parsing, state machines, finite state control, and command/response structures.

Preferred / Good-to-Have Skills

  • Experience developing multi-protocol devices.
  • BLE Mesh, Thread, Matter, or Wi-Fi IoT exposure.
  • Understanding of cloud messaging, device provisioning, and over-the-air updates.
  • Experience with mass production firmware handling edge-case stability.

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