Szymon Lesisz
Frontend Developer at SatoshiLabs
Prague, Prague, Czechia
Summary
🤩
Rockstar🎓
Top SchoolSzymon Lesisz is a seasoned Frontend Developer with over 10 years of experience building user-facing applications and interfaces, now based in Prague and contributing to complex crypto tooling. He architects and maintains open-source projects for SatoshiLabs, notably Trezor Connect and Trezor Suite, where he implements hardware wallet integrations and nuanced UI behaviors for multi-currency support. His background spans full-stack frontend work across enterprise clients and startups, with early experience in Flash, Android and backend databases that gives him a broad practical toolkit. Szymon has hands-on experience adding Trezor message signing, Taproot and ERC20 improvements, and network support for RSK/UBQ—demonstrating an ability to bridge cryptography, blockchain networks and polished UX. He combines long-form product maintenance with pragmatic feature delivery, often improving caching, conditional UI logic and coin-selection flows. Notably, his career trajectory shows a shift from agency-driven multi-client projects to deeply technical open-source crypto infrastructure.
10 years of coding experience
15 years of employment as a software developer
Informatics and ussage of Information Technology in bussines, Informatics and ussage of Information Technology in bussines at Wyższa Szkoła Ekonomiczno - Informatyczna w Warszawie
Polish, Czech, English
Github Skills (18)
javascript10
ui-components10
typescript10
web-components10
ui-design10
uid10
front-end-development10
ethereum10
typescript-types10
typescripts10
frontend10
web-frontend10
react10
tapi9
blockchain9
Programming languages (12)
Github contributions (5)
trezor/trezor-suite
Oct 2018 - Jan 2023
Trezor Suite Monorepo
Role in this project:
Front-end Developer
Front-end DeveloperContributions:1438 reviews, 1359 commits, 1188 PRs in 4 years 3 months
Contributions summary:Szymon's commits primarily involve updates to the send form actions, settings, and modal components within the Trezor Suite monorepo. They are responsible for implementing various features in the user interface, including the addition of a new component, enhancements for Taproot support, improvements in coin selection, and enhancements for showing the correct amount, particularly for ERC20 transfers. Their work involves updating HTML elements and adding logic to conditionally show UI elements.
cryptographymonorepoelectroncandyblockchain
MyEtherWallet/etherwallet
Aug 2017 - Mar 2018
Role in this project:Front-end Developer
Front-end DeveloperContributions:9 commits, 4 PRs, 1 comment in 7 months
Contributions summary:Szymon primarily contributed to the integration of Trezor hardware wallet functionality within the MyEtherWallet interface. Their work involved adding the ability to sign and verify messages using Trezor, implementing UI elements related to Trezor interaction, and updating the TrezorConnect library. Additionally, the user appears to have updated the application to support RSK and UBQ networks. Finally, they made a variety of improvements including fixing conflicts and adding a timestamp to a TrezorConnect popup to improve caching.
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