Firmware Engineer

2 weeks ago

Hyderabad, Telangana, India Tastra Foods Full time ₹ 6,00,000 - ₹ 12,00,000 per year

About the role

We are building a custom Vending Machine Controller (VMC) board in collaboration with Riosh Technologies (confirmed board components). You will be the primary firmware engineer responsible for hardware bring-up, motor/elevator control, and the machine UI (touch display). This is a high-impact role — you'll own the embedded stack for our pilot vending machines and help define firmware standards for future machines.

Key Responsibilities

  • Bring up and validate the confirmed VMC board (RPI CM4-based compute / or equivalent module).
  • Implement robust firmware for motors, sensors, elevator control, and vending sequences.
  • Develop machine-side UI screens (LCD / touch) for vendor flow (welcome, vend, error, OOS, thank you).
  • Implement comms & diagnostics (UART/SPI/I²C) and integrate with backend APIs (HTTP/MQTT).
  • Implement logging, retry/recovery logic, watchdogs, and OTA-ready hooks.
  • Work closely with Riosh (hardware partner) to validate schematics, pinouts, and run prototype tests.
  • Provide detailed handover: source code, flashing instructions, PCB pin mapping, and test procedures.
  • Provide short-term support (2–4 weeks) for bugs after delivery and assist integration testing.

Confirmed Hardware Components (you will work with)

  • Compute Module 4 (RPI CM4 or equivalent) — main processor & Wi-Fi.
  • LTE Modem + SIM connector (cellular comms).
  • RJ45 ethernet.
  • Onboard Flash (storage) and LCD display for UI.
  • Temperature sensor, IR sensor, limit switches.
  • Motor driver(s) for motors/elevator.
  • LEDs & switches for status/config.
  • 24VDC power input, surge protection, regulators (3.3V/5V).
  • PCB: 2–4 layers, 1.6mm thickness.

(These components are confirmed by our hardware partner — candidate must be comfortable with bringing-up these exact modules.)

Required Skills & Experience

  • 3–8+ years in embedded firmware development.
  • Strong C/C++ expertise; comfortable with ARM Cortex or RPi CM4 platforms (or ESP32/STM32 if relevant).
  • Experience with FreeRTOS or comparable RTOS.
  • Experience implementing motor control (DC/stepper), limit switches, IR sensors.
  • Experience debugging with logic analyzers/oscilloscopes.
  • Comfortable implementing UART/SPI/I²C, ADC, PWM, timers.
  • Prior experience integrating cellular/LTE modules, Wi-Fi and ethernet preferred.
  • Strong documentation and test case discipline.

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