Senior | Lead Firmware Engineer

Moonwatt; Diemen; On-site; EUR 60,000 - 96,000; Full time

Job summary

Moonwatt is building the next generation of energy storage systems, and we seek a Firmware Engineer to own the firmware architecture for our Battery Management System. You will design, implement, and validate embedded software to monitor and control battery performance, and mentor teammates as you shape our engineering standards.

You will work closely with hardware engineers to integrate firmware with microcontrollers, sensors, and communication interfaces, while leading testing to ensure safety

Qualifications

• 3 to 15 years of embedded firmware experience in real-time, safety-critical systems.
• Strong C/C++ for embedded systems and RTOS experience.
• Experience with MCU families (e.g., STM32) and hardware debugging tools.
• Familiar with Git and agile development methodologies.

Responsibilities

• Lead the full-stack design, development, and optimization of embedded firmware for the Battery Management System.
• Architect scalable, modular firmware systems and define system-level requirements and protocols.
• Mentor junior engineers and drive best practices in firmware design.
• Collaborate with hardware engineers to integrate firmware with components and interfaces.
• Design and execute comprehensive testing to validate firmware reliability and safety.
• Diagnose hardware–firmware issues using scopes, analyzers, and debuggers.
• Create documentation for architecture, code, and testing procedures.

Skills

C/C++ for embedded

RTOS

MCUs (STM32)

Hardware debugging

CAN Modbus SPI I2C UART

Git & Agile

Python scripting

Education

Bachelors or Masters in Electrical/Computer Engineering or CS

Tools

JTAG

Oscilloscopes

Multimeters

Job description

About The Role

Moonwatt designs and builds battery energy storage systems. We're growing our engineering team to lead the design and development of firmware for our Battery Management System, and the Firmware Engineer will play a central role in architecting, building, and validating the embedded systems that monitor and control battery performance. You will set technical standards for firmware development, mentor future team members, and work closely with hardware engineers as we bring our next generation of products to market. This is a unique opportunity to own firmware architecture from the ground up in a team small enough that you shape the outcome.

Your mission

About The Role

Moonwatt designs and builds battery energy storage systems. We're growing our engineering team to lead the design and development of firmware for our Battery Management System, and the Firmware Engineer will play a central role in architecting, building, and validating the embedded systems that monitor and control battery performance. You will set technical standards for firmware development, mentor future team members, and work closely with hardware engineers as we bring our next generation of products to market. This is a unique opportunity to own firmware architecture from the ground up in a team small enough that you shape the outcome.

What You'll Do

• Lead the full-stack design, development, and optimization of embedded firmware for our Battery Management System, ensuring robust monitoring and control of battery performance (e.g., state-of-charge, state-of-health, thermal management, fault detection, balancing).
• Architect scalable, modular, and reliable firmware systems for the BMS, defining system-level requirements, communication protocols, and integration with hardware components.
• Act as the lead engineer for firmware development, mentoring future team members, setting technical standards, and driving best practices in firmware design and implementation.
• Collaborate with hardware engineers to integrate firmware with battery system components, including microcontrollers, sensors, and communication interfaces.
• Design and execute comprehensive testing protocols to validate firmware functionality, reliability, and safety in real-world conditions.
• Diagnose and resolve complex hardware-firmware issues using tools like oscilloscopes, logic analyzers, and debuggers.
• Create detailed documentation for firmware architecture, code, and testing procedures to ensure scalability and team collaboration.

Your profile

Experience

What We're Looking For

• 3 to 15 years of experience in embedded firmware development, with a focus on designing and implementing firmware for real-time, safety-critical systems. We will tailor the role based on seniority.
• Proven expertise in designing firmware architectures for complex embedded systems, preferably for industrial-grade systems. Experience with battery management systems is a plus.
• Hands-on experience integrating firmware with hardware components, preferably in energy storage, automotive, or similar industries, including testing and debugging.

Skills

• Bachelor's or Master's degree in Electrical Engineering, Computer Engineering, Computer Science, or a related field.
• Expert proficiency in C/C++ for embedded systems programming.
• Strong experience with microcontrollers (e.g., STM32, PIC, AVR) and real-time operating systems (RTOS).
• In-depth knowledge of communication protocols (e.g., CAN, Modbus, SPI, I2C, UART).
• Proficiency with hardware debugging tools (e.g., oscilloscopes, multimeters, JTAG debuggers).
• Experience with version control systems (e.g., Git) and agile development methodologies.
• Familiarity with Python or other scripting languages for automation and testing.

Preferred Qualifications

• Experience in utility-scale energy storage or renewable energy systems, or on battery management systems.
• Knowledge of functional safety standards (e.g., ISO 26262, IEC 61508).
• Proven leadership and mentorship skills, with the ability to guide technical teams and drive projects to completion.
• Strong problem-solving skills and ability to work independently in a fast-paced startup environment.
• Excellent communication and collaboration skills to work effectively with a small, cross-functional team.
• Passion for clean energy and sustainability.

About Us

Moonwatt is developing the next generation of highly competitive Energy Storage Systems utilizing advanced sodium-ion battery technology. Our hardware and software solutions are optimized for co-location with solar power plants, enabling them to completely replace fossil-fuel power generation on the world’s power grids. We are seeking talented individuals across all areas whether you are in engineering, marketing, design, project management, HR, or finance. Join our team push the boundaries of innovation. If you are driven by the desire to create change, tackle big challenges, and make a meaningful impact, we’d love to have you onboard!