Jonathan Kingston
Staff Software Engineer at DuckDuckGo
Nottingham, England, United Kingdom
Summary
🤩
RockstarJonathan Kingston is a Staff Software Engineer with 14 years of experience building privacy-focused web technologies from browser engines to extensions and mobile apps. Based in Nottingham, he has advanced through senior engineering roles at DuckDuckGo and Mozilla, contributing to core projects like Servo, wasm-bindgen and the DuckDuckGo iOS app. His work blends front-end and systems-level expertise—implementing DOM and secure-context changes in Servo, hardening canvas and audio fingerprint protections in privacy extensions, and optimizing iOS content blocking for performance. He’s comfortable across Rust, JavaScript and C++, and has a track record of improving developer tooling and code quality (ESLint contributions, TAP formatter). Notably, he pairs security-minded design with practical shipping: refactors, integration tests and nuanced exemption logic that reduce fingerprinting surface without breaking sites.
14 years of coding experience
18 years of employment as a software developer
Stackoverflow
1,418reputation
59kreached
24answers
1question
meteor
top-5%
Github Skills (57)
webbrowser10
uitest10
static-code-analysis10
duckduckgo10
javascript10
web-platform10
ios10
type-check10
browser-extension10
testing10
macros10
css10
ember-cli10
eslint10
browser10
Programming languages (20)
Github contributions (5)
duckduckgo/duckduckgo-privacy-extension
Feb 2021 - Dec 2022
DuckDuckGo Privacy Essentials browser extension for Firefox, Chrome.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:1 release, 917 reviews, 227 commits in 1 year 10 months
Contributions summary:Jonathan's primary focus was on implementing and improving the canvas fingerprint protection feature within the DuckDuckGo privacy extension. They refactored and optimized the code, including moving injected code to its own directory and modifying pixel data for more effective fingerprinting resistance. The user also added integration tests and refined the exemption mechanisms. Additionally, the user addressed issues related to audio fingerprinting and implemented protections against it.
firefoxbrowserprivacyduckduckgochrome
mozilla/multi-account-containers
Dec 2016 - May 2019
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
Role in this project:Front-end Developer
Front-end DeveloperContributions:183 commits, 245 PRs, 102 pushes in 2 years 4 months
Contributions summary:Jonathan primarily contributed to the user interface aspects of the "Firefox Multi-Account Containers" extension. Their work involved implementing new UI components, styling them with CSS, and integrating them with the extension's functionality. The user was also responsible for modifying the existing user interface to include features related to container management, making changes to the popup and adding features like assignment. Further, the user contributed to the integration of tooltips and keyboard functionality.
identitiestabsfirefoxkeepwebextension
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