I'm Greg Johnson. Senior Full Stack Engineer based in Manchester.

I'm a senior React/Next.js contractor with over 10 years of enterprise experience building high-performance web applications. I specialise in performance optimisation, ecommerce platforms, and SaaS products.

As a performance specialist, I've delivered measurable results — reducing First Contentful Paint from 8.1s to 0.9s and Largest Contentful Paint from 10.8s to 2.3s on large-scale ecommerce sites. Speed isn't just a metric; it directly impacts revenue and user experience.

I spent nearly a decade working across Debenhams, Boohoo.com, and their family of brands — building and maintaining 12 brand sites on Salesforce Commerce Cloud. From architecture decisions to mentoring engineers and rescuing legacy codebases, I've seen the full lifecycle of enterprise ecommerce.

In 2009 I founded TWP Agency, where I build SaaS platforms and full stack applications for clients. I enjoy the variety of contracting — every project brings new challenges and opportunities to deliver real impact.