William L
Javascript Developer at Eurostar
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolWilliam L is a London-based JavaScript developer with 10 years of experience building high-performance front ends and full-stack features for companies from startups to large enterprises. He has driven migrations to modern frameworks (React/Preact, Next.js) and optimised bundle size and hydration across high-traffic products like The Guardian and Mindful Chef. At Datadog he contributed to the Browser SDK—improving error handling, tracing and internal context—which demonstrates his ability to shape cross-team APIs and ship reliable observability tooling. Equally comfortable owning UI in Electron apps for medical devices and refining CI/testing practices in product teams, he mixes pragmatic engineering with a functional-programming mindset. Outside work he’s interested in AI, music production and culinary experimentation, bringing curiosity and a taste for elegant, scalable solutions.
9 years of coding experience
6 years of employment as a software developer
BA Hons, Management, BA Hons, Management at University of NottinghamMsc Computer Science, Wireless decentralised ad hoc networks, Distinction, Msc Computer Science, Wireless decentralised ad hoc networks, Distinction at Newcastle UniversityBaccalaureate option OIB, Economics & Social Science, Baccalaureate option OIB, Economics & Social Science at Cité Scolair International de Lyon
Spanish, French, English
Github Skills (20)
javascript10
tracer10
typescript10
ui-design10
resource-monitor10
uid10
sdk10
front-end-development10
typescript-types10
preact10
error-handling10
typescripts10
trace10
react10
webbrowser9
Programming languages (7)
Github contributions (5)
DataDog/browser-sdk
Jul 2022 - Dec 2022
Datadog Browser SDK
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:185 reviews, 242 commits, 54 PRs in 5 months
Contributions summary:William primarily contributed to the Datadog Browser SDK, implementing and extending features related to internal context, error handling, and tracing for resource events. Their work involved modifications across various packages, including logs, core, and rum-core, demonstrating a broad understanding of the SDK's architecture. Specific contributions involved refactoring code, updating unit tests, and adding new functionality for user context and fetch duration calculations.
golangsdkbrowserdatadog
guardian/frontend
May 2020 - May 2021
The Guardian DotCom.
Role in this project:Front-end Developer
Front-end DeveloperContributions:50 reviews, 37 commits, 37 PRs in 1 year
Contributions summary:William primarily focused on updating and refactoring front-end components. They migrated the project to Preact X, as indicated by the extensive code changes across multiple JavaScript files and the `webpack.config.js` file. Furthermore, the user worked on decoupling Braze from the application and modified code related to audio playback and UI elements, demonstrating a focus on improving user experience and maintaining the front-end codebase.
productionguardian
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