John Sundell
Writer & Podcaster at The John Sundell Company
Gdansk, Pomeranian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolJohn Sundell is a Swift-focused developer, writer, and podcaster with over a decade of experience building apps, games, and developer tools while running the influential Swift by Sundell weekly content series. He combines hands-on engineering—authoring popular open-source projects like Files, Publish, Plot, ShellOut and the ImagineEngine game engine—with a knack for explaining complex Swift topics to the community through articles and interviews. As a former lead iOS developer at Spotify, he has deep experience designing frameworks and component-driven UIs at scale. His tooling work (e.g., Marathon, TestDrive, SwiftPlate) shows a consistent focus on improving developer workflows and automation. Based in Gdańsk, Poland, he freelances and maintains broad open-source involvement that often blends backend, CLI, and cross-platform concerns. An uncommon strength is his dual role as both prolific creator and meticulous tester, evidenced by extensive test and cross-platform compatibility work on projects like Ink.
12 years of coding experience
13 years of employment as a software developer
Donnergymnasiet
English, Swedish, Spanish
Stackoverflow
9reputation
318reached
2answers
2questions
Github Skills (81)
dependency-management10
parserator10
parser10
m-files10
testing10
command-line-interface10
bash10
templater10
automation10
text-files10
text-processing10
game-development10
markdown10
rss10
file-management10
Programming languages (5)
Github contributions (5)
JohnSundell/Marathon
Mar 2017 - Sep 2019
[DEPRECATED] Marathon makes it easy to write, run and manage your Swift scripts 🏃
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:8 releases, 212 commits, 100 PRs in 2 years 6 months
Contributions summary:John primarily focused on improving the Marathon project by adding new features and fixing existing bugs. Their contributions include adding support for running and installing remote scripts, supporting Swift 5 scripting, and integrating inline dependency resolution. They also made improvements to the command-line interface, enhanced error messages, and optimized build processes, demonstrating a comprehensive understanding of the project's architecture.
macosswiftmarathon
JohnSundell/Ink
Nov 2019 - May 2020
A fast and flexible Markdown parser written in Swift.
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:10 releases, 6 reviews, 33 commits in 5 months
Contributions summary:John primarily contributed to the project by adding and maintaining comprehensive testing infrastructure for the Markdown parser. They focused on ensuring cross-platform compatibility, specifically by adding support for Linux environments, and rigorously testing various aspects of the parser's functionality, including HTML parsing and entity handling. Their work involved adding test cases, defining test manifests, and ensuring all tests run correctly across different operating systems. This resulted in better code coverage and overall stability of the Markdown parser.
commonmarkmarkdown-parserstatic-site-generationswiftparser
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