Callum Locke

London, England, United Kingdom

Join Prog.AI to see contacts

Summary

🤩

Rockstar

Callum Locke is a London-based web developer with 15+ years delivering customer-facing web apps and platforms across media and travel sectors. He has led full-stack teams and shipped features and services using React, TypeScript, Node.js, PostgreSQL and .NET Core at companies including Trainline, Financial Times and Tempo. Comfortable moving between hands-on front-end polish and backend type-safety, he has contributed Flow type definitions and UX improvements to open-source projects—examples include enhancing keyboard navigation and theming for a popular JSON formatter. Known for meeting tight newsroom and product deadlines, he blends pragmatic engineering with attention to user experience and build-process quality. Callum’s background spans roles from web technician to principal engineer, giving him deep institutional knowledge of building reliable, maintainable web platforms.

15 years of coding experience

9 years of employment as a software developer

Stackoverflow

Stats

211reputation

23kreached

0answers

1question

Github Skills (34)

libstdc10

libc10

javascript10

npm10

lib10

flow-control10

libudev10

browser-extension10

css10

flow-typed10

work-flow10

libdispatch10

gulp10

user-interface10

ui-design10

Programming languages (18)

MDXCSSC++RustPugGoHTMLSvelte

Github contributions (5)

callumlocke/json-formatter

Aug 2012 - Dec 2022

Makes JSON easy to read.

Role in this project:

Front-end Developer

Contributions:1 release, 44 commits, 14 PRs in 10 years 6 months

Contributions summary:Callum primarily focused on enhancing the user interface of the JSON formatter. Their contributions include modifying CSS and JavaScript to improve the appearance and functionality of the formatting buttons and the overall display of formatted JSON. They removed a transition, likely for performance, and implemented keyboard navigation, improving user interaction. The user also addressed several visual and usability aspects, such as removing focus rings and correcting theme rendering, demonstrating a dedication to user experience.

json-viewerjson

flow-typed/flow-typed

Nov 2017 - Jun 2019

A central repository for Flow library definitions

Role in this project:

Full-stack Developer

Contributions:13 commits, 12 PRs, 12 comments in 1 year 7 months

Contributions summary:Callum primarily contributed to the project by adding and updating Flow type definitions for various npm packages. They created type definitions and tests for libraries like `pify`, `resolve-from`, `filesize-parser`, `minimatch`, `pretty-bytes`, `tempy`, and `del`. Additionally, the user addressed existing definitions for `react-intl` and `query-string`, improving their accuracy. Furthermore, the user modified the helmet and koa definitions, making options optional.

libdefsflowtypedefinitionscli

Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.

Request Free Trial