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About the Role

Octopus is pioneering new smart home technology and is looking for a skilled Embedded Firmware Engineer specializing in IoT products to shape the software driving their next generation of Smart Home Wi-Fi connected products. You will help build innovative, energy-saving smart devices that keep homes warm and lower energy bills, collaborating across platform and app engineering teams to drive the firmware lifecycle from initial requirements to hands-on development and ongoing field deployment.

Responsibilities

Write well-structured, testable, efficient, and maintainable software for connected devices.
Work within a dedicated cross-functional team on key products.
Take ownership of IoT products and features, ensuring high-quality, modular, and maintainable code.
Manage tickets and development efforts with hardware and software teams.
Collaborate with customer-facing and software teams to resolve bugs and implement new features.
Participate in code reviews to ensure high standards.
Work flexibly across projects to meet deadlines.
Willingness to learn new technologies and skills as required.

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, code optimization, 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.

Skills

C
Real-Time Operating Systems (RTOS)
FreeRTOS
Python
Bash
Git
Schematics
Data sheets
SPI
I2C
UART
RS232
Modbus
MAC
IP
TCP
TLS
DHCP
IoT security
Secure boot
Encrypted flash
Public key cryptography
Board bring-up
Design validation
Code optimization
JTAG/SWD
Oscilloscopes
Multimeters
Logic analyzers
ESP32
ESP-IDF
AWS IoT
OTA firmware updates
BLE
Wi-Fi
Zigbee

Location

Remote
London
Slough

Work Type

Majority remote
Full-time

Experience Level

Experienced

Education Level

B.S. in Computer Science, Electronic Engineering, or a related field

Salary/Compensations

Salary is discussed during the recruitment process

Benefits

Unique culture
Autonomy
Opportunity to work on groundbreaking projects
UK's top company to work for in 2025
Ranked in the top ten in the Sunday Times Best Places to Work 2026
Top 10 companies for senior leadership
Customizable interview process

About the Company

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.

Equal Opportunity

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.
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. Whoever you are, if you like one of our jobs, we encourage you to apply as you might just be the candidate we hire.
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.