Senior Full Stack Engineer

About the role

We’re looking for a Senior Full Stack Engineer to lead the development and scaling of the systems that power our renewable energy products. You will own end-to-end technical solutions, make architectural decisions, and influence the technical direction of the platform.

You will proactively identify opportunities to improve systems, processes, and practices, and help build a culture of excellence. Collaboration is key: you’ll mentor and develop engineers around you, ensuring the team grows in capability while establishing a robust, scalable technical foundation for long-term growth.

This role also requires the ability to deliver complex projects independently, confidently driving features from concept to production when needed. You will work closely with non-technical stakeholders, translating business needs into technical strategy and delivering high-quality solutions with minimal oversight.

Responsibilities

• Lead the design, development, and delivery of customer-facing and internal applications using React + TypeScript
• Architect and implement APIs, microservices, and serverless functions in Node.js on AWS, ensuring scalability, reliability, and maintainability
• Proactively identify technical improvements, bottlenecks, and opportunities to enhance systems and workflows
• Collaborate with product, design, and operations teams to translate complex requirements into technical solutions
• Drive code quality through advanced testing practices, code reviews, and automation
• Mentor and build up junior and mid-level engineers, fostering growth, confidence, and technical excellence across the team
• Participate in technical roadmap planning and provide input on architectural and strategic decisions
• Take ownership of technical debt, performance optimisation, and long-term maintainability

Requirements

• Extensive commercial experience with Node.js/TypeScript
• Strong expertise in building and deploying services on AWS (Lambda, API Gateway, DynamoDB, SQS/SNS, S3)
• Deep understanding of REST APIs, event-driven architectures, and distributed systems
• Proven experience delivering projects independently and proactively resolving complex technical challenges
• Strong experience with testing strategies (unit, integration, e2e, load testing)
• Demonstrated ability to mentor engineers, foster growth, and raise the overall technical capability of a team
• Experience leading the delivery of complex features from concept to production
• Excellent communication and collaboration skills, including working with non-technical stakeholders

Nice to have

• Experience with Infrastructure as Code, preferably Terraform, with familiarity in AWS CDK
• Advanced knowledge of serverless architectures and distributed systems
• Experience integrating with complex third-party APIs or data sources
• Knowledge of energy/utility industry workflows (Elexon, smart meters, billing, pricing)
• Exposure to large-scale monorepo or multi-service architectures
• Experience in technical leadership, architecture design, and proactively shaping engineering practices
• Bachelor’s degree in Computer Science, Software Engineering, or a related technical discipline