Ioan 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 College
Master's Degree, Computer Science, Master's Degree, Computer Science at Technical University of Cluj Napoca
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Ioan L - Lead Engineer (Full Stack) at ImmoScout24 Austria