We're making energy fair, clean, and simple for all using technology. 

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain’s largest energy supplier. 

Octopus Energy Group is a global energy transition collective. 10 businesses working across 4 continents to tackle energy transformation at nearly every front.

And we constantly push to make energy better. Tirelessly campaigning for fair protections for customers. And building innovative technologies that forge a path to a green energy system.

We’re made up of 10,000+ authentic, committed people working around the world on stuff you'd never expect. We're united by a shared goal: to drive the global green energy revolution. Read our Spotlight series to meet some of the team.

To deliver on this mission, we are looking for a Senior Data Engineer to join the Flexibility team.

The Flexibility team was established in early 2026, and has been growing throughout the year. The team is focused on greenfield opportunities at the cutting edge of Octopus' flexibility strategy, and aims to enable rapid response to global flex opportunities.

They are building the next generation of products and tools to make energy more flexible. These include our flagship Intelligent Octopus product automating demand shift for 300,000 customers with electric cars, home batteries or smart heating devices, saving 2 million customers money through Saving Sessions and Free Electricity Sessions, and managing 568MW of large grid-scale batteries to balance the system. The team develops products that are used by millions of customers, helping boost renewables use and decarbonise energy systems worldwide.

We embrace flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity. 

We don’t hang our personalities up with our coats and nor should you. At Octopus, we hire great people who get stuff done, all whilst being themselves.

If this sounds exciting, we’d love to chat.

We're making energy fair, clean, and simple for all using technology. 

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain’s largest energy supplier. 

Octopus Energy Group is a global energy transition collective. 10 businesses working across 4 continents to tackle energy transformation at nearly every front.

And we constantly push to make energy better. Tirelessly campaigning for fair protections for customers. And building innovative technologies that forge a path to a green energy system.

We’re made up of 10,000+ authentic, committed people working around the world on stuff you'd never expect. We're united by a shared goal: to drive the global green energy revolution. Read our Spotlight series to meet some of the team.

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier. 

By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain’s largest energy supplier.

Now, we’re scaling fast and building the next generation of products to accelerate the green energy transition. From making it effortless to switch to heat pumps, solar and EVs, to launching smart tariffs and creating renewable generation at scale, we’re solving some of the most complex challenges in energy with speed, creativity and customer obsession. We’re also enabling our global businesses to reach the full capability of what we’ve achieved in the UK, taking the learnings, products and experiences that customers love here and rolling them out worldwide.

At Octopus Tech, you’ll have real ownership, variety, and the chance to shape products that make a tangible difference in people’s lives - lowering bills, enabling greener living, and delivering experiences customers genuinely love. You’ll work side by side with teams across marketing, operations, and data, and see the impact of your work in the real world, fast.

We are looking for Backend Engineers (mid level) to join our Devices team and Low Carbon Tech team.

Devices: Since launching our first piece of hardware, Home Mini, in 2022, followed by Cosy Heat Pumps in 2023 and the Charge EV Charger in 2025, we have continued to expand our portfolio of devices, helping customers make the green energy transition.

You'll join a cross-functional team of backend and mobile engineers, working closely with our hardware team to extend and improve integrations for both existing and new devices in the Octopus Energy app. This includes the recently announced Nook family of home batteries, with more exciting products already in the pipeline. If you want to design and build solutions that scale low-carbon technology in homes across the UK, this is the mission for you.

Low Carbon Tech:  Low Carbon Tech are installing EV Chargers, Solar, Batteries and Heat Pumps into homes to drive the energy transition at pace. As customer demand grows, our goal is to ensure scaling up never means slowing down or compromising on a world-class customer journey for low carbon tech. 

To make that happen, we are building a new, dedicated engineering and product team to completely re-imagine this process - making it fast, transparent, and predictable for our customers from day one. This will be a small multi-disciplinary team who’ll sit within our much bigger low carbon tech team.

You’ll help design and build the platform architecture, data integrations, and automations that eliminate real world friction. If you want to design and build solutions to scale up electrotech in the nation’s homes, this is the mission for you.

We embrace flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity. 

We don’t hang our personalities up with our coats and nor should you. At Octopus, we hire great people who get stuff done, all whilst being themselves.

If this sounds exciting, we’d love to chat.

Wir bauen die Brücke zwischen Business Operations, Data und unseren B2B-Kunden. In dieser Rolle entwickelst du die zentralen Schnittstellen unserer Plattform und gestaltest die technische Zukunft unseres Kundenportals maßgeblich auf Basis von Python und Django.

Die Herausforderung

Unsere operativen Prozesse leben in unserem CRM-System, unsere Daten-Intelligence in Databricks. Deine Aufgabe ist es, diese Welten sicher, performant und skalierbar miteinander zu verbinden. Du entwickelst unsere B2B-APIs weiter, automatisierst die Anbindung externer Dienstleister und baust eine moderne, zukunftsfähige Python/Django-Architektur auf.

 

Dabei sind unsere Ökostromtarife nur die Basis. Außerdem arbeiten wir aktiv an der flächendeckenden Einführung von Smart Metern, Elektromobilitätslösungen und der eigenen Stromerzeugung aus Wind- und Sonnenenergie. Wir haben kein geringeres Ziel, als die global benötigte Energie 100% nachhaltig zu gestalten. Global, agil und zukunftsorientiert verändern wir den Energiemarkt mit neuer Technologie zum Besseren.

 

Doch all das gelingt nur mit deinem Engagement! Werde Teil unseres Teams und hilf uns, die Zukunft der Energieversorgung zu gestalten. Gemeinsam schaffen wir eine Energiezukunft, die nicht nur gut für den Planeten, sondern auch für dein Karma ist. 💚 Finde deinen Traumjob bei Octopus Energy und werde Teil der Energierevolution!

Sitting within the Systems and Data / Transformation team, you will turn existing platform architectures, governance specs, and prototype patterns into production-grade infrastructure. You’ll work alongside our Tech and Transformation Lead, data engineers, application builders, and business stakeholders across Finance, Asset Management, and Fund Operations.

This is not a general DevOps or blank-page architecture role. The primary focus is designing and implementing enterprise-grade identity, access, and governance controls across human users, systems, and non-human agents.

Our Tech & Ecosystem: Databricks, Lakebase, Unity Catalog, Entra ID / Azure Identity, Okta, ZScaler, GitHub Actions, MCP patterns, and Terraform.

• Design, build and commission hydraulic test rigs and prototype products that integrate with heat pumps (buffer tanks, hot water cylinders, heat exchangers, circulation and modulation hardware, and similar).

• Carry out hands-on assembly and plumbing of water-side and refrigerant-adjacent systems - pipework, fittings, pumps, valves, sensors and controls.

• Instrument rigs with temperature, flow and pressure measurement, and run structured test campaigns to characterise both systems and components performance.

• Diagnose and troubleshoot hydraulic, thermal and mechanical issues on live systems, and feed findings back into the design.

• Work closely with the wider R&D team to iterate designs quickly, balancing performance, cost, manufacturability and serviceability.

• Produce clear documentation: test plans, build instructions, results write-ups and design records.

• Degree in Mechanical Engineering (or a closely related discipline).

• Minimum 5 years' relevant experience in an R&D, product development or test environment.

• Demonstrable heat pump knowledge - you understand how heat pumps work, their operating envelopes, and how the hydraulic system around them behaves (flow, temperature, ΔT, defrost, modulation, etc.).

• Strong hands-on experience - this is the most important requirement. You can build, plumb, commission and fault-find systems yourself, not just specify them. Practical plumbing and pipework skills are essential.

• Experience working with hydraulic systems - pumps, valves, heat exchangers, tanks, pipework and the behaviour of water-side circuits.

• Comfortable instrumenting rigs and interpreting test data to draw engineering conclusions.

• CAD proficiency for designing rig components and prototype parts.

• Able to work independently and using own initiative on-site in Slough and move quickly in a fast-paced R&D environment.

• Experience developing products specifically intended to operate with heat pumps (buffer tanks, hot water cylinders, DHW modules, hydraulic interface units, etc.).

• Familiarity with refrigerant-side systems and relevant safety considerations.

• Thermal/fluids analysis skills (thermodynamic modelling, or sizing calculations) to support design decisions.

• Experience in setting up, running, and interpreting FEA (structural/thermal) and CFD analyses on complex systems. 

• Relevant trade or industry qualifications (e.g. plumbing, F-Gas, G3 unvented hot water) - not required but valued.

• Experience taking products through prototype into early manufacture.

• A genuinely hands-on R&D role at the leading edge of UK heat pump accessory product development.

• A well-equipped facility and the freedom to build and test real hardware.

• A collaborative team that moves fast and values practical engineering judgement.

• Competitive contract day rate, commensurate with experience.

• Octopus Energy 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!

• Visit our perks hub - Octopus Employee Benefits