Embedded Hardware/PCB & Firmware Engineer Required-Kolkata

We are looking for an experienced freelance Embedded Hardware + PCB + Firmware Engineer for an IoT/industrial electronics project.

Location: Kolkata preferred

Required hands-on experience:
• STM32 Nucleo / Discovery boards
• Embedded C/C++ and STM32 firmware
• UART / USART / RS485 / Modbus RTU
• USB-to-RS485 & UART-to-RS485
• GSM / 4G / LTE modules and AT commands
• PCB schematic & layout – KiCad / Altium / Eagle / EasyEDA
• Component selection & BOM preparation
• Power supply and protection circuits
• Logic analyzer / oscilloscope / multimeter
• PCB bring-up, debugging and hardware testing
• Sensor and industrial interface integration
• ADC / 4–20mA / 0–2V interfaces

Good to have: ESP32, MQTT, LoRa, FreeRTOS, CAN, BLE/Wi-Fi and industrial IoT experience.

Engagement: Project-based initially, with possibility of long-term collaboration.

We are specifically looking for someone who is hands-on with hardware and can independently troubleshoot a PCB—not only firmware/software development.

Please share:

CV/Profile
Previous PCB/IoT projects
STM32 experience
PCB designs/portfolio
Availability
Expected hourly/project rate
Kolkata location