Lewis Barclay — Software Engineer, London
I build web softwarethat ships, scales & lasts.
Twenty-plus years of full-stack engineering, cloud architecture and AI integration for M&S, Fidelity, Barclays, Gousto and the scale-ups that needed to move fast without breaking anything.
01By the numbers
20+
Years in web software
70+
Production websites delivered
33%
Build-time reduction at Gousto
60
Engineers in one global platform team
Two decades, these names
WPP·M&S·Fidelity Investments·Barclays·Gousto
02What I do
01
Full-Stack Engineering
TypeScript, Node.js, React, Next.js, GraphQL. From schema to pixel, owned end to end.
02
Cloud & DevOps
AWS-first architecture, Azure when it fits, CI/CD pipelines that deploy themselves.
03
AI & LLM Integration
Claude, GPT, Gemini and DeepSeek wired into real products, with the guardrails and evals that make them production-safe.
04
Leadership & Mentoring
Teams led, roadmaps owned, engineers grown. Scrum, Kanban and DORA measured honestly.
03The short version
I'm a technologist with broad experience and an in-depth understanding of web software. My work covers leading and managing engineering teams through to hands-on engineering, UX and UI design. I've delivered cloud-based software for large corporations like Fidelity, Barclays Investment Bank and Marks & Spencer, for scale-ups like Gousto, and for digital agencies including AKQA. After twenty years in this field I'm still learning — and that's still the best part of the job.
London, where most of the work happens.
“
Everything is possible. How long it takes is the challenge!
Make it work.
Make it right.
Make it fast.