Jonathan Welzel
Frontend Engineer at MediaMarktSaturn
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolJonathan Welzel is a frontend engineer based in Berlin with 13 years of professional experience building responsive, well-tested UIs and full-stack web applications. He specializes in React (and emerging frameworks like Qwik) alongside a strong Java background, repeatedly modernizing legacy stacks and introducing component libraries and front-end best practices. At companies from startups to MediaMarktSaturn he has driven product adoption, led migrations from jQuery to React, and helped establish CI, monitoring, and testing workflows that improved stability and developer velocity. Comfortable across the stack, he has hands-on experience with AWS, New Relic, Selenium, and mobile clients that expanded product capabilities. Known for pixel-perfect interfaces, he also brings an engineer’s operational sensibility—building status pages, observability, and automated tests to keep UIs reliable in production.
13 years of coding experience
13 years of employment as a software developer
Federal University of Technology – Paraná
English
Stackoverflow
25reputation
557reached
0answers
2questions
Github Skills (114)
javascript9
rest9
api9
grunt-task9
bootstrap9
webpack9
bootstrap-components9
react9
jetty9
jax-rs9
java9
scene8
rest-api8
react-redux8
dropwizard8
Programming languages (4)
Github contributions (5)
mercos/mp-components
Aug 2016 - Oct 2016
Meus Pedidos React components.
Contributions:129 commits, 18 PRs, 71 pushes in 1 month
reactjavascriptpedidosreact-componentsreactjs
jnwelzel/histogram-slider
May 2020 - Jun 2024
Histogram with slider control built using Airnbnb's Rheostat, SVG and React
Contributions:11 PRs, 33 pushes, 12 branches in 4 years 2 months
react-componentreactsvgsliderslider-control
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.