Fuse Energy UK

Vertically integrated energy: generation, trading, retail

Firmware Engineer

Embedded EngineeringConfirmed live in the last 24 hours

Full-timeLondon, UKIn-person

About the Job

Requirements

At least 2 years of experience in embedded systems or firmware engineering.
Strong proficiency in C and experience writing firmware for microcontrollers.
Hands-on experience with common microcontroller peripherals, including SPI, I2C, UART, DMA, timers, ADCs, Flash, and CAN.
Experience working with real-time systems and embedded development toolchains such as GNU and IAR.
Familiarity with version control and tooling such as Git, Docker, and continuous integration pipelines.
Ability to work with hardware debugging tools, including oscilloscopes, logic analysers, and JTAG/SWD.

Responsibilities

Develop low-level firmware and drivers for microcontrollers and embedded peripherals, including SPI, I2C, UART, DMA, and ADC.
Design and implement real-time control software and embedded algorithms for energy devices.
Write, test, and debug embedded C/C++ firmware running on bare-metal or RTOS-based systems.
Collaborate with hardware, systems, and controls teams to define firmware requirements and test plans.
Participate in code reviews, write documentation, and contribute to continuous improvement of firmware practices.
Assist in board bring-up, profiling, and debugging using tools such as oscilloscopes, JTAG/SWD, and logic analysers.
Implement and maintain bootloaders, linker scripts, and firmware deployment pipelines.

Desired Qualifications

Experience with power electronics or grid-connected converter controls.
Knowledge of control systems and digital signal processing, including FIR, IIR, and FFT.
Familiarity with embedded bootloaders, memory maps, and linker scripts.
Experience with board bring-up and low-level hardware/software integration.

Firmware Engineer

Fuse Energy · London, United Kingdom · Full-time · Posted 2026-10-06

Workplace: on_site

Description

Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast. We're combining first-principles thinking with cutting-edge technology to build a radically better energy system. We raised $170M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more.

We’re creating a fully integrated energy company: from developing solar, wind and hydrogen projects to real-time power trading and distributed energy installations. By selling directly to consumers, we cut out the middleman, lower costs and pass on savings to customers.

But we’re not stopping there. We’re also building the Energy Network: a decentralised platform of smart devices to electrify our homes, shifting usage to off-peak hours and helping balance the grid. This network strengthens grid stability - a critical foundation for scaling AI data centers and other energy-intensive industries.

Responsibilities

Develop low-level firmware and drivers for microcontrollers and embedded peripherals (SPI, I2C, UART, DMA, ADC, etc.)
Design and implement real-time control software and embedded algorithms for energy devices
Write, test, and debug embedded C/C++ firmware running on bare-metal or RTOSbased systems
Collaborate with hardware, systems and controls teams to define firmware requirements and test plans
Participate in code reviews, write documentation and contribute to the continuous improvement of firmware practices
Assist in board bring-up, profiling and debugging using tools like oscilloscopes, JTAG/SWD, and logic analysers
Implement and maintain bootloaders, linker scripts and firmware deployment pipelines

Requirements

2+ years of experience in embedded systems or firmware engineering
Strong proficiency in C, with experience writing firmware for microcontrollers
Hands-on experience with common MCU peripherals: SPI, I2C, UART, DMA, timers, ADCs, Flash, CAN, etc.
Experience working with real-time systems and embedded development toolchains (e.g., GNU, IAR)
Familiarity with version control and tooling (e.g., Git, Docker, CI pipelines)
Ability to work with hardware debugging tools (oscilloscopes, logic analysers, JTAG/SWD)

Bonus

Experience with power electronics or grid-connected converter controls
Knowledge of control systems and digital signal processing (FIR, IIR, FFT)
Familiarity with embedded bootloaders, memory maps and linker scripts Experience with board bring-up and low-level hardware/software integration

Benefits

Competitive salary and an equity sign-on bonus
Biannual bonus scheme
Fully expensed tech to match your needs
Paid annual leave
Breakfast and dinner allowance for office based employees

Apply

Apply at Fuse Energy

About the Company

Fuse Energy UK

Vertically integrated energy: generation, trading, retail

Fuse Energy UK is a London-based energy company that handles renewable generation, trading, and retail supply for households and businesses in a single chain. It owns and operates solar and wind farms, trades electricity to balance supply and price, and sells energy directly to customers, reinvesting profits into new renewable projects. Its edge comes from being vertically integrated across generation, trading, and retail, with strong backing from investors and a leadership team formerly at Revolut. Its goal is to grow its UK customer base and expand into Ireland, Spain, and the US while scaling up renewable capacity.

Company size: 201-500
Company stage: Series B
Total funding: $200M
Headquarters: London, United Kingdom
Founded: 2022

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