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Octopus Energy is a global energy transition collective with 10,000+ people working across 4 continents. In 2025, they became Britain's largest energy supplier by combining world-class technology with a commitment to the renewable energy transition.
The Low Carbon Tech team is installing EV Chargers, Solar, Batteries, and Heat Pumps into homes to drive the energy transition at pace. They are building a new, dedicated engineering and product team to completely reimagine the customer journey for low carbon tech installations—making it fast, transparent, and predictable from day one.
As a Senior Full Stack Engineer (frontend focus), you will:
• Serve as a bridge across the entire stack, building end-to-end capabilities while helping frontend and backend developers grow their skills
• Take full ownership of features end-to-end, delivering reliable, production-ready code with significant autonomy
• Shape the architecture of brand-new projects from scratch and refactor existing codebases
• Maintain high frontend standards in AI-assisted workflows by vetting AI outputs, catching edge cases, and protecting long-term code health
• Communicate technical ideas clearly, prioritizing high-signal context
• Keep releases smooth with automated CI/CD workflows and set up production monitoring
• Work closely with product managers and designers to find efficient paths to ship value
Octopus embraces flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity. The company was named the UK's top company to work for in 2025 and ranked in the top ten in the Sunday Times Best Places to Work 2026.
REQUIREMENTS:
• 5+ years of experience with the required stack (React, TypeScript, Next.js on Vercel, Python/Django, testing infrastructure including Playwright/vitest/MSW, observability tools like Datadog/Sentry, CI tools like Github/CircleCI)
• Experience taking problems rather than strict guidelines and developing strong solutions
• Confidence owning the full development cycle: request, requirements gathering, technical proposal, execution, deployment, and monitoring
• Ability to tackle large-scale tasks individually
• Empathetic approach to delegating work and collaborating with others
• Ability to develop websites meeting strong accessibility guidelines
• Experience building scalable, performant sites handling high traffic
• Eagerness to drive cross-functional work spanning frontend, backend, DevOps, and infrastructure
• Pragmatic AI mindset with experience in AI workflows and tooling: building harnesses, custom agent skills, MCP integrations, token minimization strategies
• Desirable: energy domain knowledge
• Desirable: GraphQL with Tanstack Query, PostgreSQL, Celery, asynchronous background processing
