Jakub Jóźwiak
Staff Software Engineer at Housecall Pro
Warsaw, Masovian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolJakub Jóźwiak is a Staff Software Engineer with over eight years of full‑stack experience building scalable web apps, backend services, integrations, and developer tooling, currently based in Warsaw. He holds an engineering degree in computer science completed with distinction and brings strong TypeScript expertise alongside curiosity for other languages and domains like finance, IoT, PWAs and web animations. Jakub has driven architecture, estimation, testing and maintenance across the project lifecycle and moved into staff-level responsibilities at Housecall Pro after senior roles at ERGO and intent. He's an active open-source contributor—working on notable projects such as the Polkadot UI and a smart-contract testing library where he implemented a solidity flattener and e2e test suites—showing comfort across compiler tooling, frontend Electron apps and testing frameworks. Known for leading tech talks and mentoring, he combines hands-on engineering with a pragmatic focus on quality, developer experience and deliverable outcomes.
8 years of coding experience
8 years of employment as a software developer
Engineer's degree Computer Science, Engineer's degree Computer Science at Polish-Japanese Academy of Information Technology
Italian, English, Polish, German, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (20)
javascript10
solidity10
electron10
compiler-development10
testing10
typescript10
ui-design10
webpack10
ethereum10
webpacker10
chai10
typescript-types10
smart-contracts10
typescripts10
react10
Programming languages (3)
Github contributions (5)
TrueFiEng/Waffle
Apr 2020 - May 2020
Library for writing and testing smart contracts.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:32 commits, 10 PRs, 58 pushes in 25 days
Contributions summary:Jakub contributed to the development of the `waffle` library, focusing on enhancing its functionality and usability. Their primary contributions involved implementing a flattener tool within the compiler, enabling users to combine solidity source code and its dependencies. Furthermore, the user worked on a Chai matcher to test calls on smart contracts. This suggests involvement in both the compiler backend and the testing framework frontend. Finally, the user also added an e2e test suite.
ethereumtestingsoliditysmart-contractscontracts
polkadot-js/apps
May 2020 - Jun 2020
Basic Polkadot/Substrate UI for interacting with a Polkadot and Substrate node. This is the main user-facing application, allowing access to all features available on Substrate chains.
Role in this project:Front-end Developer
Front-end DeveloperContributions:8 commits, 11 PRs, 24 pushes in 10 days
Contributions summary:Jakub primarily focused on enhancing the Polkadot/Substrate UI, especially within the electron application. Their work included implementing new features like relative window sizing and integrating the electron updater. They also refactored webpack configurations, removed unnecessary dependencies, and addressed minor code issues to improve application functionality.
substrateblockchainwalletchainssubstrate-node
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