Piotr Zalewa
Software Architect at SIMPLITO
Toruń, Kuyavian-Pomeranian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolPiotr Zalewa is a seasoned software architect and founder with 16+ years building scalable web platforms, best known as the creator of JSFiddle — a developer playground used by millions and a catalyst for similar tools across the web. After a decade as a Mozilla staff engineer shaping Firefox OS, developer tools and CI/CD systems, he now architects AI infrastructure, MCP implementations, and intelligent agents for enterprise applications while leading technical transformation at payment and healthcare startups. He blends hands-on engineering (Python, Django/Flask, JS, React, GraphQL, PostgreSQL, AWS) with product-minded scalability—having grown JSFiddle into a profitable, high-traffic service. A pragmatic mentor and consultant, he’s contributed to notable open-source projects (Cordova plugins, service worker examples) and has experience making systems compliant with privacy and regulatory standards like RODO/HIPAA.
16 years of coding experience
18 years of employment as a software developer
Technik Programista, Technik Programista at Programowanie Maszyn CyfrowychNicolaus Copernicus University
German, Russian, Polish, English
Stackoverflow
4,741reputation
295kreached
38answers
8questions
authentication
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many-to-many
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javascript
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html
top-5%
Github Skills (38)
objective-c10
file-management10
ios10
javascript10
cordova10
apple-push-notifications10
push-notifications10
webpush10
service-worker10
firefox10
android10
indexeddb10
mobile10
nodejs10
fetch-api10
Programming languages (13)
Github contributions (5)
apache/cordova-plugin-contacts
Nov 2013 - May 2014
Apache Cordova Plugin contacts
Role in this project:
Mobile Developer
Mobile DeveloperContributions:34 commits in 6 months
Contributions summary:Piotr primarily contributed to the Apache Cordova Plugin contacts, specifically focusing on the Firefox OS implementation. Their work involved translating contact objects between the Cordova and Firefox OS APIs, enabling saving, removing, and searching contacts. Key contributions include refactoring and fixing contact data translation, and debugging issues related to Firefox OS contact storage, ultimately resulting in a functional contacts plugin.
objective-ccontactscordovaapache-cordovajavascript
apache/cordova-plugin-inappbrowser
Apr 2014 - Sep 2014
Apache Cordova InAppBrowser Plugin
Role in this project:Mobile Developer (Android/iOS)
Mobile Developer (Android/iOS)Contributions:20 commits, 1 comment in 5 months
Contributions summary:Piotr contributed to the `apache/cordova-plugin-inappbrowser` repository by implementing and refactoring the InAppBrowser plugin for Firefox OS. The contributions involved adding basic support, refactoring existing code, and incorporating features like back/forward buttons. The focus was on creating a functional in-app browser experience with features like close, back, and forward functionality, particularly for the Firefox OS platform.
objective-ccordovaapache-cordovajavascriptapache
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