Jakub Romańczyk
Expert Software Engineer at Callstack
Krakow, Lesser Poland Voivodeship
Summary
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Rockstar🎓
Top SchoolJakub Romańczyk is an Expert Software Engineer with 8 years’ experience specializing in React Native, bundler infrastructure, and modular microfrontend architectures for mobile. At Callstack he led efforts to bring Module Federation to Metro, collaborated directly with Meta, and maintained Re.Pack while shipping major releases integrating Rspack and Module Federation 2.0. He combines full-stack chops—mobile, backend, and tooling—with a practical focus on performance and operational cost reduction, evidenced by optimizations for low-end Android devices and AI platform infrastructure. An active OSS contributor to React, React Native, Metro and related tooling, he also translates technical work into impact through talks, courses, and pre-sales engagement. Based in Krakow, Jakub blends deep engineering execution with a builder’s mindset, treating complex product constraints as solvable engineering problems.
8 years of coding experience
6 years of employment as a software developer
Bachelor of Engineering - BE Computer Science, Bachelor of Engineering - BE Computer Science at Wrocław University of Science and Technology
Polish, English
Github Skills (76)
parser10
mobile-development10
swc10
chat10
bundler10
declarative10
collaboration10
jsx10
markdown10
javascript10
ecosystem10
reanimated10
app-framework10
monorepository10
flow-based-programming10
Programming languages (8)
Github contributions (5)
callstack/news-mini-app-showcase
Apr 2023 - Mar 2025
Contributions:11 PRs, 14 pushes, 4 branches in 1 year 11 months
jbroma/module-federation-core
Jul 2024 - Mar 2025
Module Federation is a concept that allows developers to share code and resources across multiple JavaScript applications
Contributions:27 pushes, 3 branches in 7 months
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