Role: Embedded Hardware Engineer
Industry Type: IT Services & Consulting
Department: Engineering - Hardware & Networks
Employment Type: Full Time, Permanent
Role Category: Hardware
UG: Any Graduate
PG: Any Postgraduate
What Youll Build Firmware for ESP32-based edge gateway - Wi-Fi/4G connectivity, OTA update system, watchdog, low-power modes Modbus RTU master over RS485 - poll inverter registers (voltage, current, power, energy, temp, fault codes) every 60 seconds MQTT client - publish inverter data to EMQX broker with QoS 1, retain on local flash during network outages Local data buffering - store up to 24 hours of data in NVMe / SPIFFS / SD card during connectivity loss, auto-sync on reconnect Sensor integration - DS18B20 (panel temperature via 1-Wire), optional I C sensors (irradiance, humidity) OTA (Over The Air) firmware updates - using ESP-IDF OTA partition or STM32 bootloader Device provisioning - Wi-Fi credential setup via BLE, web captive portal, or QR code STM32-based variant (if applicable) - low-power data logger with RS485 + GSM/4G modem
Required Skills
C / C++ embedded programming - memory management, register-level access, structural firmware architectures ESP32 (ESP-IDF framework preferred) - Wi-Fi, BLE, SPIFFS/NVMe, GPIO, UART, I C, SPI, timers Modbus RTU / ASCII - master implementation over UART/RS485, CRC validation, register map reading MQTT protocol - client implementation, QoS levels, last will, retained messages, reconnection logic UART / RS485 hardware interface - half-duplex, DE/RE control, baud rate configuration Debugging tools - JTAG, serial monitor, logic analyser, oscilloscope basics Git - firmware versioning, release tagging, change logs Basic understanding of power systems - inverter communication is safety-critical Bonus Skills (Good to Have) FreeRTOS - task management, queues, semaphores on ESP32 or STM32 STM32 HAL / LL drivers - UART, SPI, I C, DMA, low-power modes (Stop, Standby) 4G LTE modems - SIM7600, Quectel EC25, AT command handling, PPP / ECM data mode TLS/SSL on embedded - MBEDTLS, certificate provisioning, MQTT over TLS Rust for Embedded - experience or strong interest in migrating safe systems to embedded Rust Python scripting - for device testing automation, register scan tools KiCad / EasyEDA - ability to read schematics (even if not designing them) Youll Thrive Here If You Have built and shipped a real embedded project - not just dev-board demos Are methodical about debugging - you use a logic analyser before assuming a software bug Understand that firmware running next to a live solar inverter must be reliable, not clever Document your register maps, protocol notes, and wiring decisions - the hardware team needs it Are comfortable with ambiguity in hardware specs - inverter datasheets are often incomplete What You Get Build production firmware for a device deployed at real solar sites - not lab prototypes Work alongside PCB hardware engineers - learn the full hardware-to-cloud stack Access to test equipment: oscilloscopes, logic analysers, RS485 sniffers Growth path into senior embedded or IoT architect role
Disclaimer
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