GJ

Greg Johnson

Available to hire

Senior Full Stack Engineer with 10+ years of experience building high-performance React and TypeScript applications across SaaS and large-scale web platforms.

About

Senior Full Stack Engineer with 10+ years of experience building high-performance React and TypeScript applications across SaaS and large-scale web platforms.

Strong focus on UI quality, responsiveness, state management, and translating complex workflows into intuitive product experiences. Experienced in frontend architecture, performance optimisation, dashboards, authentication flows, and scalable component-based systems.

Comfortable partnering across product, design, and engineering to prototype, iterate, and ship polished user-facing features.

  • 16 years' experience
  • Joined March 2026

Languages

  • EnglishFluent

Industry experience

  • Software & Internet
  • Retail
  • Media & Entertainment
  • Professional Services

More experts

Work experience· 4 roles

Senior Full Stack Engineer · Debenhams / Boohoo.comFeb 2016 – Feb 2026 · 10 yrs 1 mo

Designed and built full-stack applications using React, Next.js, TypeScript, Node.js/Express, and PostgreSQL. Developed desktop-ready productivity apps with Electron. Built a contractor recruitment platform from scratch with OpenAPI integrations and guided question flows that generate customized CVs. Created a real-time multiplayer card game web app using Socket.IO. Delivered a SaaS workforce time-tracking platform with real-time dashboards and reporting. Implemented secure authentication, role-based dashboards, and multi-platform API integrations. Improved usability and performance by refining loading states and interaction flows. Collaborated with product and design to refine user journeys and responsive UI behavior; built reusable frontend patterns and component systems. Achieved significant performance gains (FCP from 8.1s to 0.9s; LCP from 10.8s to 2.3s on mobile 4G).

Lead Web Developer · The Drawing Room CreativeJun 2013 – Feb 2016 · 2 yrs 9 mos

Led frontend development for client projects, collaborating with design and production teams to deliver responsive, high-quality web experiences. Built and iterated on design systems and component libraries to streamline delivery and ensure consistency across platforms.

Web Developer · Ormskirk Indy VisualsMay 2010 – Sep 2012 · 2 yrs 5 mos

Developed websites and web applications, built frontend interfaces, and optimized performance for diverse client projects.

Junior Web Developer · Liverpool North West OnlineApr 2009 – Sep 2010 · 1 yr 6 mos

Education

BSc in Web Development · Edge Hill University2010 – 2013

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