Real-Time Embedded Firmware Engineer (STM32/ESP32, C/C++)

CircuitWorx; West Dean; On-site; GBP 36,000 - 44,000; Full time

Benefits offered by this job

Profit sharing

Private healthcare

Flexible 36-hour week

Casual dress code

On-site parking

Job summary

CircuitWorx seeks an embedded firmware engineer to design, develop, and maintain multiple client projects on STM32/ESP32 platforms. You will implement real‑time applications with FreeRTOS/Zephyr and develop Python tooling, including Raspberry Pi platforms.

The role is based at our West Dean office, a 3‑month contract with potential to become permanent. We offer a salary of £40,000 with profit sharing, pension, private healthcare, and a 36‑hour week with flexible patterns.

Qualifications

• 2+ years of professional embedded firmware development experience.
• Strong proficiency in C and C++ for bare-metal and RTOS-based systems.
• Hands-on experience with ARM Cortex-M architecture.
• Proven experience with STM32 and/or ESP32 microcontrollers.
• Solid understanding of embedded communication interfaces: I2C, SPI, UART, CAN.
• Ability to read and interpret schematics and datasheets.
• Comfortable working across multiple concurrent projects with varying requirements.
• Experience with FreeRTOS and/or Zephyr RTOS.
• Familiarity with Linux-based development environments, including build systems, shell scripting, and toolchains.
• Python development experience, particularly on Raspberry Pi platforms.
• Awareness of industry standards relevant to medical or automotive development.
• Experience with version control (Git) and CI/CD pipelines for embedded systems.
• United Kingdom work authorisation required.

Responsibilities

• Design, develop, and maintain firmware in C/C++ for embedded microcontroller‑based systems across multiple client projects.
• Develop drivers and middleware for communication interfaces including I2C, SPI, UART, and CAN.
• Work with STM32 and ESP32 platforms across the full development lifecycle, from hardware bring‑up through to production release.
• Implement real‑time applications using FreeRTOS and/or Zephyr.
• Develop supporting tooling and automation scripts in Python, including on Raspberry Pi‑based platforms.
• Debug and optimise firmware using tools such as JTAG/SWD debuggers, logic analysers, and oscilloscopes.
• Collaborate with hardware engineers to review schematics and support PCB bring‑up.
• Engage directly with clients to understand requirements and communicate technical progress where needed.
• Contribute to code reviews and uphold high standards of code quality, documentation, and traceability, particularly important in regulated industries such as medical and automotive.

Skills

C/C++

Embedded firmware

RTOS (FreeRTOS/Zephyr)

ARM Cortex-M

Git

CI/CD

Python

Linux toolchains

Reading schematics

I2C/SPI/UART/CAN

Client collaboration

Tools

STM32

ESP32

JTAG/SWD

Raspberry Pi

Job description

CircuitWorx seeks an embedded firmware engineer to design, develop, and maintain multiple client projects on STM32/ESP32 platforms. You will implement real‑time applications with FreeRTOS/Zephyr and develop Python tooling, including Raspberry Pi platforms.

The role is based at our West Dean office, a 3‑month contract with potential to become permanent. We offer a salary of £40,000 with profit sharing, pension, private healthcare, and a 36‑hour week with flexible patterns.