Senior Full Stack Engineer

Who We Are: We're rebuilding the energy transaction system, making it transparent and fair. tem exists to put power back in the hands of people. Today’s wholesale energy market is stacked in favor of the few. It's a product of an age of oil and gas, riddled with markups and middlemen. We’re changing that. Our product, RED™, built on a proprietary pricing engine that bypasses the wholesale market, enables businesses to buy the energy produced by renewable generators directly. That's 100% transparent transactions, ensuring affordable bills and fair compensation, to give every business ownership and control over where their energy comes from. Since launching in 2021, we’ve saved UK businesses and generators over £20 million, powering a growing network of forward-thinking companies, from Pizza Pilgrims to Silverstone. Backed by top-tier VCs such as Atomico and Albion, we’re creating a new category in energy - one that’s local, decentralized, and built on trust.

The Role: We’re looking for Senior Full Stack Engineers to design and build the systems that power tem's core products and internal platforms. We’re hiring across several teams - including Platform, Billings, Payments, Customer Acquisition, and Customer Success - all of which play a critical role in how we deliver seamless, modern energy technology. As a Senior Engineer, you’ll help shape the architecture and build the features that enable brokers, customers, and internal teams to work smarter and faster. Depending on your team, this could mean anything from enhancing developer tooling and shared services, to building scalable billing and payments infrastructure, to delivering intuitive customer-facing experiences that support acquisition and retention. In your first 12 months, you might: Lead development of customer- and broker-facing portals that make complex energy workflows simple. Build and evolve billing and payments systems that are reliable, transparent, and ready for scale. Improve developer experience and platform foundations - including tooling, CI/CD, shared services, and automation. Streamline internal operations through intelligent workflows, dashboards, and integrations.

Responsibilities: Build with impact: Develop full-stack features across modern front-end frameworks and serverless back-end systems, with a focus on performance, reliability, and usability. Shape the experience: Build intuitive, high-quality interfaces and tools that improve the way customers and brokers interact with our platform. Improve how we ship: Contribute to internal tooling, frameworks, and engineering workflows that help us deliver faster and with greater confidence. Collaborate cross-functionally: Partner with Product, Design, and other Engineers to design thoughtful, user-centered solutions to complex problems. Maintain high standards: Write clean, well-tested code, contribute to code reviews, and help improve team practices and documentation.

Requirements: Must-Haves: Proven product delivery experience: Experience as a Full Stack Engineer in a startup or fast-paced product environment, with ownership of key projects from start to finish. Front- and back-end fluency: Strong experience with Python and/or Node.js, and modern JavaScript frameworks like React. Cloud-native skills: Experience working with AWS services, especially serverless tools like Lambda, API Gateway, and DynamoDB. User-focused mindset: Comfortable turning product and user problems into simple, elegant technical solutions. Team-first approach: Experience working in cross-functional teams where Engineers, Designers, and Product Managers collaborate closely.

Benefits & Perks: Competitive salary - our current band for this role is £81,300 or equivalent in local currency. We review salaries twice a year using real-time market data, with transparent, consistent pay for the same role and level. Stock Options - everyone on the team has ownership in our mission. 25 days holiday + public holidays - Swap public holidays for ones that matter most to you. Plus, get an extra day off for your birthday. Remote & flexible working - We’re fully remote, distributed across Europe with clear core hours, and no internal meetings on Friday afternoons. Home working & wellbeing budgets: Up to £1,200 / €1,200 annually to upgrade your remote setup (co-working passes, equipment, etc.). Up to £150 / €150 monthly on anything that supports your wellbeing - from therapy to gym memberships to meditation apps.