Szymon Marczak
Lublin Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolSzymon Marczak is a seasoned Node.js engineer with 11 years of experience specializing in HTTP, DNS and protocol-level tooling, known for maintaining the popular got HTTP client and authoring http2-wrapper and cacheable-lookup. He contributes to core Node.js modules and major HTTP libraries like undici and has improved reliability and proxy functionality in projects such as Apify's Crawlee and proxy-chain. Comfortable in TypeScript and low-level networking, he repeatedly fixes tricky socket, redirect and timeout edge cases that make HTTP stacks robust in production. Based in Lublin, Poland, he’s currently exploring language design—an uncommon blend of pragmatic product-focused engineering and systems-level curiosity.
11 years of coding experience
1 year of employment as a software developer
Engineer's degree, Computer Software Engineering, Engineer's degree, Computer Software Engineering at Politechnika Lubelska
English, Polish
Stackoverflow
1,106reputation
275kreached
10answers
28questions
Github Skills (36)
puppeteer10
javascript10
clientside10
testing10
http10
typescript10
proxy10
proxy-server10
webscraping10
networking10
gcc10
automation10
dns10
typescript-types10
crawler10
Programming languages (24)
Github contributions (5)
kkthxbye-code/csgo_bugs
Apr 2020 - Jan 2021
Random CSGO stuff
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 reviews, 76 commits, 20 PRs in 9 months
Contributions summary:Szymon primarily contributed to tools related to a CS:GO game exploit, developing utilities that interact with the game client through a netcon connection. Their work involved parsing network event data, manipulating crosshair settings, and implementing an auto-defuse feature for bomb scenarios. The commits demonstrate expertise in networking, game data manipulation, and potentially, reverse engineering or exploiting game mechanics.
internalcsgoexploit
apify/proxy-chain
Aug 2021 - Oct 2022
Node.js implementation of a proxy server (think Squid) with support for SSL, authentication and upstream proxy chaining.
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 releases, 107 reviews, 54 commits in 1 year 2 months
Contributions summary:Szymon primarily focused on debugging and improving the proxy server's core functionalities. Their contributions included fixing invalid CONNECT responses, addressing socket close race conditions, and incorporating custom bad gateway statuses to improve error handling. The user also added tests, including one to prevent event emitter memory leaks. These commits show a focus on the server's stability and robustness.
javascript-libraryproxy-serversslproxyupstream-proxy
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