IoT Engineers build the full stack of connected devices — from C/C++ firmware running on ESP32, STM32, and Nordic nRF52 microcontrollers to the MQTT/CoAP messaging layer, AWS IoT Core or Azure IoT Hub cloud backend, and time-series ingestion pipelines in InfluxDB or TimescaleDB. In India, the role spans smart-home hardware at Atomberg, Havells, Legrand, boAt, and Wakefit; industrial IoT at Honeywell, Siemens, Bosch, L&T Technology Services, and Tata Elxsi; asset tracking and telematics at Jio, Reliance Jio Platforms, and Tata; and government-grade smart-city/smart-grid IoT at BEL, BSNL, and ECIL. Unlike pure embedded engineers, IoT Engineers must simultaneously own low-power radio link budgets (BLE, Wi-Fi, LoRa, NB-IoT, Zigbee), device identity and certificate provisioning, over-the-air (OTA) update security, and cloud-side data pipelines — the role is inherently cross-layer.