Firmware Engineer C/RTOS

Firmware Engineer

Candidate Profile (Must Have)

• Experience: 5+ years of commercial experience in embedded projects (bare metal or RTOS).

• Language & Tools:
  Strong C skills; CMake/Make; GCC/Clang or MCU vendor toolchains; Git; debugger tools (J-Link / ST-Link); trace and profiling tools.

• Microcontrollers:
  ARM Cortex-M (e.g. STM32 / NXP / Infineon) or equivalent; ability to read and apply datasheets and reference manuals.

• HAL / Drivers:
  Design and modification of low-level drivers (GPIO, ADC, PWM, I2C, SPI, UART, watchdog, timers) as well as drivers for external peripherals (e.g. EEPROM).

• Communication:
  CAN bus (filters, masks, bitrates, transceivers, termination); basic knowledge of SocketCAN (Linux); design of application-level communication protocols.

• Bootloader / Firmware Update:
  Experience in bootloader implementation, firmware updates (e.g. via CAN), integrity verification (CRC), rollback mechanisms and secure update strategies.

• Measurements & Protections:
  Design and validation of current, voltage and temperature measurements (ADC, oversampling, calibration) and protection mechanisms (thresholds, hysteresis, time-based debouncing).

• Software Architecture:
  Design of modular software architecture: clear layer separation (HAL/Drivers, Services, Protocol, Application), state machines, event loops, interface abstractions.

• Quality & Testing:
  Integration testing, functional verification, error logging and tracing; ability to develop Linux-based test tools (SocketCAN).

• Documentation:
  Technical specifications (drafting, review), block diagrams, in-code documentation, changelogs, and environment setup instructions.

Nice to Have

• RTOS experience (FreeRTOS / Zephyr)

• MISRA C

• Unit testing (Ceedling / Unity)

• Continuous Integration (GitHub Actions / GitLab CI)

• Static analysis (clang-tidy, cppcheck)

• Experience with safety-critical systems (e.g. automotive, industrial)

• EMC / ESD awareness

• Knowledge of UDS / ISO-TP, CANopen / J1939

Environment & Tools (Required)

• Repository & Branching:
  Git with pull requests, code reviews, and commit conventions (e.g. Conventional Commits).

• Build System:
  CMake/Make or IDE-based toolchains; per-target configurations (Debug / Release).

• Debugging:
  J-Link / ST-Link, SWD, OpenOCD; flashing scripts (e.g. make flash).

• Linux Test Rig:
  SocketCAN (can0, cangen, candump); custom CLI test application for Control Board simulation.

• Documentation:
  Markdown / AsciiDoc; diagrams in draw.io / PlantUML; test checklists.

• Issue Tracking:
  JIRA or GitHub Issues with linkage to commits and pull requests.