Embedded Firmware Engineer

Octopus Energy Ltd; Slough; On-site; GBP 55,000 - 75,000; Full time

Benefits offered by this job

Employee Benefits

Job summary

Octopus Energy Ltd is seeking an embedded software engineer to develop and maintain firmware for our connected devices. You will join a dedicated cross-functional team delivering IoT features for customers and internal use.

The role emphasizes ownership of firmware, modular design, and high-quality code. You will collaborate with hardware, cloud, and security teams, participating in reviews and OTA update implementations.

Qualifications

• Proficiency in C for real-time operation on constrained microcontrollers.
• Hands-on RTOS experience (FreeRTOS) in embedded environments.
• Fluency in scripting languages (Python, Bash) and Git version control.
• Ability to read schematics and data sheets for hardware/software debugging.

Responsibilities

• Write well-structured, testable, efficient software for Octopus' connected devices.
• Collaborate within cross-functional teams on key products for customers and internal teams.
• Own IoT products and features; deliver high-quality, modular, maintainable code.
• Manage tickets and development efforts with hardware and software teams.
• Work with customer-facing and software teams to investigate bugs and implement features.
• Participate in code reviews and maintain high coding standards.
• Flexibly contribute across projects to meet deadlines.
• Willingness to learn new technologies as required.

Skills

C programming

RTOS (FreeRTOS)

Python

Git

Schematic reading

Serial protocols

IoT security TLS

JTAG/SWD debugging

ESP32/ESP-IDF

AWS IoT

OTA updates

Wireless protocols

Education

B.S. in Computer Science or Electronic Engineering

Tools

ESP32

ESP-IDF

AWS IoT

Job description

Responsibilities

• Write well structured, testable, efficient and maintainable software for Octopus' connected devices


• Work within a dedicated cross-functional team on key products for our customers or our internal teams.


• Take ownership of our IoT products and features, ensuring delivery of high quality code that is modular and maintainable


• Manage tickets and development efforts with the hardware and software teams


• Work closely with other customer facing and software teams to investigate and resolve bugs and implement new features


• Participate in code reviews and ensure code is meets a high standard


• Work flexibly across projects to meet challenging, customer-driven deadlines


• Willingness to learn new technologies and skills as require

Requirements

• Proficiency in C for real-time operation on highly constrained microcontrollers and custom hardware using official vendor APIs


• Hands-on experience with Real-Time Operating Systems (RTOS), such as FreeRTOS


• Fluency in scripting languages (e.g., Python, Bash) and version control using Git


• Ability to read schematics and data sheets for hardware and software debugging


• Practical knowledge of common serial protocols (e.g., SPI, I2C, UART, RS232, Modbus) and networking fundamentals (e.g., MAC, IP, TCP, TLS, DHCP)


• Familiarity with IoT security technologies, such as secure boot, encrypted flash, TLS, and public key cryptography


• Hands-on experience with board bring-up, design validation, and debugging via JTAG/SWD or test equipment (e.g., oscilloscopes, multimeters, logic analyzers)


• B.S. in Computer Science, Electronic Engineering, or a related field, Hands-on experience with the ESP32 family and ESP-IDF


• Background building IoT products with cloud platforms (e.g., AWS IoT)


• Experience implementing OTA firmware updates within automated build environments


• Exposure to short-range wireless protocols including BLE, Wi-Fi, or Zigbee


• Proven experience delivering connected IoT devices within complex, multi-system ecosystems

Salary and Compensation

Wondering what the salary for this role is? Just ask us! On a call with one of our recruiters it's something we always cover as we genuinely want to match your experience with the correct salary. The reason why we don't advertise is because we honestly have a degree of flexibility and would never want salary to be a reason why someone doesn't apply to Octopus - what's more important to us is finding the right octofit!

Company Culture & Perks

Octopus Energy Group is a unique culture. An organisation where people learn, decide, and build quicker. Where people work with autonomy, alongside a wide range of amazing co-owners, on projects that break new ground. We want your hard work to be rewarded with perks you actually care about! We were named the UK's top company to work for in 2025, and we ranked in the top ten in the Sunday Times Best Places to Work 2026. Our Group CEO, Greg has recorded a podcast about our culture and how we empower our people. We've also been placed in the top 10 companies for senior leadership.

Visit our UK perks hub - Octopus Employee Benefits

Equal Opportunity Statement

Need any specific accommodations? Whether you require specific accommodations or have a unique preference, let us know, and we'll do what we can to customise your interview process for comfort and maximum magic! Studies have shown that some groups of people, like women, are less likely to apply to a role unless they meet 100% of the job requirements. Across Octopus, we're looking for genuinely decent people who are honest and empathetic. Our people are our strongest asset and the unique skills and perspectives people bring to the team are the driving force of our success. As an equal opportunity employer, we do not discriminate on the basis of any protected attribute. Our commitment is to provide equal opportunities, an inclusive work environment, and fairness for everyone.