Daniel Cassidy
Independent Software Developer at Velope Inc.
Great Yarmouth, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolDaniel Cassidy is an independent software developer with 19 years of experience building robust back-end systems, game engines, and tooling from Great Yarmouth, UK. He combines hands-on R&D leadership at Velope with long-term freelance work, bringing practical expertise in C++, TypeScript, and JavaScript across media, gaming, and ad-tech domains. His open-source contributions span respected projects like jsdom and prebid-server—improving DOM conformance, test coverage, and privacy/consent handling—and lower-level work in Haxe/C++ for cross-platform media playback. Comfortable across full-stack and QA roles, he’s shipped bug fixes, refactors, type definitions, and test suites that improve reliability and developer experience. Notably, he has experience modernizing legacy codebases and integrating third-party codecs and consent systems, showing a pragmatic approach to interoperability. Trained in Computer Science at the University of Essex, he pairs deep technical craft with a focus on maintainable, well-tested software.
19 years of coding experience
6 years of employment as a software developer
Bachelor of Science (BSc), Computer Science, Bachelor of Science (BSc), Computer Science at University of Essex
Github Skills (39)
unit-testing10
json10
code-optimization10
debug10
static-typing10
javascript10
ccpa10
c-language10
game-engine10
multiplatform10
testing10
haxe10
actionscript10
typescript10
typescript-definitions10
Programming languages (21)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Sep 2017 - Jul 2021
The repository for high quality TypeScript type definitions.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:16 reviews, 65 commits, 50 PRs in 3 years 10 months
Contributions summary:Daniel primarily contributed to the type definitions for the doubleclick-gpt library, which is related to Google Publisher Tag, fixing lint rule violations and ensuring code quality. They also added type definitions for the setasap and improved the types for the promise-polyfill library. Additionally, the user fixed various linting issues in the jwplayer definitions.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
excaliburjs/Excalibur
May 2019 - Jun 2021
🎮 Your friendly TypeScript 2D game engine for the web 🗡️
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:1 review, 6 commits, 8 PRs in 2 years 1 month
Contributions summary:Daniel primarily contributed to improving the Excalibur.js game engine, focusing on code quality, bug fixes, and feature enhancements. Their work involved refactoring and modernization efforts by replacing 'var' with 'const/let', addressing volume ramping issues, and fixing typos in code. Furthermore, the user worked on improving the opacity management of actors and adjusting how they are drawn, updating the engine's dependency on certain features.
html5-gamegamegamesgamedevjavascript
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