Full Stack Developer

About TEAM LEWIS   TEAM LEWIS is a global marketing agency that has moved from start-up to multinational in a little over two decades. Its success is due to a combination of factors: its ability to read the future and prepare for it; leveraging cutting-edge AI; strategic thinkers delivering award-winning campaigns; expanding client relationships into new markets or services; and above all, independence from outside investors. The practice, its people, and its campaigns have won many awards, including Cannes Lions, PRovoke Media, ICCO, European Excellence, PRCA Digital, Digital Impact, Global Digital Excellence. At the heart of our community is the TEAM LEWIS Foundation (TLF), a non-profit charitable entity. Since its launch in 2021, it has funded over 2,600 causes. It is one of the largest employee-directed philanthropies in the world. The TLF promotes a wide variety of social, cultural, and environmental causes that benefit society. It aims to strengthen the bonds between the creative industries, businesses, government, and non-profits. Community charities are championed by employees who, in addition to the financial donation, volunteer their time and skills to maximise grant effectiveness. You can read more here about TEAM LEWIS Foundation . Purpose of the role TEAM LEWIS is looking for a Full Stack Developer to join our team of creative, forward-thinking developers. We’re seeking someone equally comfortable building polished, performant user experiences and designing/implementing the server-side architecture, integrations, and deployment patterns needed to run production systems reliably. This is an exciting time to join TEAM LEWIS as we expand our development capability. We need a developer who can ship end-to-end features, strengthen engineering standards, and provide broad technical coverage across projects—rather than a narrow specialist with limited scope. You will deliver full-stack digital experiences across websites, applications, and campaigns, taking work from concept through build, release, and iteration. You’ll be hands-on in code, contribute to architecture decisions, and help the team develop scalable patterns (reusable components, shared services, consistent environments). You’ll also bring pragmatic “platform awareness” to ensure our systems are maintainable and secure, without requiring a dedicated DevOps hire at this stage. Responsibilities End-to-end feature delivery • Build and ship full-stack features using Next.js / React , TypeScript , and modern styling approaches (e.g., SCSS / Tailwind ). • Own work across the stack: UI, server-side rendering, API routes/services, data access patterns, integrations, and deployment readiness. • Translate requirements into technical solutions that deliver measurable business value (performance, conversion, maintainability, speed-to-market). Full-stack architecture & back-end development • Design and implement server-side functionality (APIs/services), authentication/authorization patterns, and integration with third-party systems. • Apply strong engineering fundamentals: data modelling concepts, caching strategies, error handling, observability/logging, and secure coding practices. • Contribute to architectural decisions and ensure solutions uphold the creative vision while remaining scalable and supportable. LLM + RAG • Design, build and ship LLM-enabled product features using Retrieval-Augmented Generation (RAG) patterns (document ingestion, chunking, embeddings, retrieval, and prompt orchestration). • Integrate RAG workflows with a vector database and LLM providers, ensuring outputs are grounded, safe, and useful for end users. • Optimise performance and cost (e.g., token efficiency, caching, rate limits) and implement practical guardrails (validation, fallback behaviour, monitoring signals). Quality, performance & standards • Maintain high standards of accuracy and attention to detail in all code deliverables. • Champion testing and quality practices (unit/integration/e2e where appropriate) and performance best practices (Core Web Vitals, SSR/ISR decisions, image optimisation, etc.). • Work with the Head of Development to maintain and evolve development standards, templates, and reusable “blueprint” assets. Delivery enablement (light DevOps / platform awareness) • Support reliable delivery through pragmatic CI/CD and environment practices (e.g., Git workflows, build pipelines, release processes). • Ensure repositories are set up and maintained correctly, and architecture documentation remains current. • Partner with the team on sensible deployment, monitoring, and operational practices. (This is not a dedicated DevOps role ) Team contribution • Encourage and inspire excellence across development and design teams; share lessons learned to support continuous improvement. • Contribute to diversifying the development product portfolio by identifying opportunities to expand capability and improve internal efficiency. About you You are an engaging, forward-thinking full-stack developer with a user-centred mindset and strong engineering fundamentals. You can work independently, communicate clearly, and take ownership of delivering production-ready outcomes in a fast-paced, international environment. Technical skills • Strong experience with Next.js + React and TypeScript in production. • Strong JavaScript fundamentals and modern front-end best practices. • Solid back-end concepts: APIs/services, auth, data modelling principles, performance, security. • Experience building responsive, accessible, SEO-friendly experiences (HTML/CSS, W3C and accessibility standards). • Practical experience delivering or supporting LLM/RAG-enabled features in real products, including retrieval patterns, prompt orchestration, and performance/cost considerations (e.g., token optimisation/caching). Nice to have • Experience with CI/CD tooling and modern release practices (UI-driven or config-based pipelines). • Exposure to…