Ioan L
Lead Engineer (Full Stack) at ImmoScout24 Austria
Vienna, Austria
Summary
👤
Senior🎓
Top SchoolIoan L is a Lead Full Stack Engineer based in Vienna with over a decade of experience building high-performance, SEO-first web platforms and cloud-native backend systems. He led the rewrite of ImmoScout24 Austria into a server-side streamed React app focused on sub-350ms responses and significantly improved organic traffic and Core Web Vitals through careful UX and performance work. Skilled in Node.js, TypeScript, React, GraphQL and AWS, he has a track record of diagnosing hard production issues—such as tracing HEAP dumps to fix memory leaks that cut infrastructure costs by 60% and sped responses by 95%. Ioan also migrated complex payment systems to account-based flows using Step Functions and serverless patterns, and has repeatedly rebuilt acquired frontends to improve SEO discoverability. He combines deep low-level performance debugging with pragmatic architectural decisions, often finding cost-saving opportunities that aren’t obvious from surface metrics.
10 years of coding experience
6 years of employment as a software developer
Mathematics and Computer Science, Graduate, Mathematics and Computer Science, Graduate at “Ioan Slavici“ National CollegeMaster's Degree, Computer Science, Master's Degree, Computer Science at Technical University of Cluj Napoca
Romanian, English, French, German
Github Skills (200)
epub10
visual-studio10
webextension10
spotify10
gameplay10
vector-graphics10
windows-app10
windows-desktop10
dock10
docx10
mvvm10
wallpaper-manager10
nodejs10
layout-engine10
computercraft10
Programming languages (21)
Github contributions (5)
vanja-san/comic-book-reader
Sep 2022 - Feb 2025
ACBR - A comic book reader and converter for cbz, cbr, cb7, epub and pdf files (Windows & Linux)
Contributions:34 pushes, 2 branches in 2 years 6 months
pdf-filesacbrlinux-windowspdfcbz
vanja-san/vanja-san
Oct 2021 - Apr 2022
Contributions:134 pushes, 1 branch in 6 months
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