Jimmy Wärting
Freelance at Jmmy Wärting Consulting AB
Sweden
Summary
🤩
Rockstar🎓
Top SchoolJimmy Wärting is a full-stack JavaScript engineer and freelance consultant with 13 years of experience building modern web and media systems using Node.js (and Deno), vanilla JS, and streaming technologies like HLS/DASH and WebRTC. He’s a prolific open-source maintainer—best known for contributions to WebTorrent and StreamSaver.js—that power real-world streaming and file-saving workflows used by thousands monthly. Jimmy’s work spans backend APIs, realtime systems, and performant frontends, and he’s shipped integrations for customers like MTR Express, Svensk Travsport/ATG, and logistics optimizations at Gordon Delivery. He brings a security-aware mindset from finding and fixing issues across projects, helping teams avoid common pitfalls. Comfortable moving quickly in tight agency timelines or owning long-term platform code, he combines pragmatic engineering with a curiosity-driven “mad scientist” approach. Based in Sweden, he’s currently available for contract consulting.
13 years of coding experience
10 years of employment as a software developer
Nackademin yrkeshögskolaTeknik, Teknik at Östra gymnasiet
Swedish, English
Github Skills (61)
server-side10
assertion10
xlsx10
open-api-v310
compatible10
javascript10
arraybuffer10
amqp10
testing10
spreadsheet10
http10
refactor10
browser-support10
supertest10
service-worker10
Programming languages (29)
Github contributions (5)
jimmywarting/StreamSaver.js
May 2016 - Feb 2022
StreamSaver writes stream to the filesystem directly asynchronous
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:8 releases, 7 reviews, 212 commits in 5 years 9 months
Contributions summary:Jimmy primarily worked on front-end development, making significant changes to the `example.html` and `index.html` files. They implemented features related to saving streams directly to the filesystem, interacting with service workers, and creating a user interface for file saving options. Additionally, the user debugged and refactored code related to service worker interactions, ensuring cross-origin compatibility and resolving issues related to HTTPS and localhost.
ramasynchronousjsinteropfilesaverstreaming
node-fetch/node-fetch
Aug 2016 - May 2022
A light-weight module that brings the Fetch API to Node.js
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 releases, 151 reviews, 42 commits in 5 years 10 months
Contributions summary:Jimmy primarily contributed to the core functionality of the `node-fetch` library, focusing on improving its compliance with the Fetch API specification. They implemented features related to handling URLSearchParams, ensuring correct Content-Type headers, and improving how the library processes different body types, specifically by unifying the internal body representation as a buffer. The user also optimized the codebase and added new reading methods to the Blob API, improving its utility.
apilight-weightlightnode-jshttp-client
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.