Jonathan Fielding
Principal Engineer at Legend
Ashford, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJonathan Fielding is a hands-on Principal Engineer with 14 years of experience building and modernizing web platforms across security, telecoms, finance, digital marketing and social media. He combines frontend expertise (React, TypeScript, Storybook) with backend skills in Node.js and Postgres to decompose monoliths, improve core web vitals, and deliver maintainable service architectures. As a technical leader he has driven engineering playbooks, mentorship programs, and DEIA initiatives while saving businesses significant costs through platform migrations. An active speaker and open-source contributor, he has enhanced responsive image support in the widely used polyfill-service and regularly shares practical web-focused talks—including on using JavaScript beyond the browser for home automation. Based in Ashford, UK, he pairs pragmatic architecture decisions with a community-minded approach, running meet-ups and chairing workplace accessibility groups. Outside work he’s a prolific reader of web trends and a longtime anime fan, which occasionally informs his creative problem-solving.
14 years of coding experience
16 years of employment as a software developer
King George V College, SouthportBsC 2:1 Internet Computing with Business Management, BsC 2:1 Internet Computing with Business Management at University of Hull
English
Stackoverflow
3reputation
65reached
1answer
1question
Github Skills (15)
javascript10
utilities10
common-library10
c-library10
poly10
polyfills10
responsive-images10
standard-library10
testing10
html9
responsive-design6
distortion6
typescript4
typescripts4
typescript-types4
Programming languages (10)
Github contributions (5)
angus-c/just
Aug 2016 - Aug 2016
A library of dependency-free JavaScript utilities that do just one thing.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:15 commits, 2 PRs, 7 comments in 1 day
Contributions summary:Jonathan primarily focused on developing utility functions for a JavaScript library. Their work involved implementing a function to check if an object is empty and subsequently refactoring it. They wrote tests for the functions and updated the project structure with the addition of the tests. These changes demonstrate an understanding of library development and testing best practices.
javascript-freeresolveone-thingtinyjavascript
polyfillpolyfill/polyfill-service
Jul 2015 - Jun 2017
Automatic polyfill service.
Role in this project:Front-end Developer
Front-end DeveloperContributions:4 PRs, 32 comments in 1 year 11 months
Contributions summary:Jonathan primarily contributed to the PictureFill polyfill, adding functionality for the Picture element. Their work focused on enhancing the responsive image capabilities of the polyfill. The user implemented updates and modifications to the polyfill's JavaScript code, adding functionality to support the Picture element. These changes were likely aimed at ensuring compatibility across different browsers for responsive image features.
origamipolyfillsystemcode-origami-polyfill-servicejavascriptpolyfill-service
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