Mikołaj Leszczyński
Senior Android Engineer at Whatnot
Gdańsk, Pomeranian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolMikołaj Leszczyński is a Senior Android Engineer with 11 years of experience building scalable, user-focused mobile apps from startups to large enterprises. He has driven architecture and tooling improvements at companies like Babylon Health—where he led a Java-to-Kotlin migration and authored the Orbit MVI framework—and now shapes Android at Whatnot. Known for moving teams from MVP to MVI, introducing coroutine-first SDKs, and designing end-to-end testing strategies, he blends hands-on engineering with strong architecture leadership. An active open-source contributor and core developer of orbit-mvi, he focuses on refactoring, StateFlow-based state management, and Compose helpers to improve developer ergonomics. Based in Gdańsk, he pairs a pragmatic, metrics-driven approach with a passion for mentoring and sharing knowledge through talks and articles. Colleagues describe him as continually improving both products and people, often spotting and fixing subtle API or event-loop issues before they reach production.
12 years of coding experience
10 years of employment as a software developer
Master of Science (MSc), Computer Software Engineering, Master of Science (MSc), Computer Software Engineering at Technical University of Gdansk
Polish, English, German
Github Skills (4)
kotlin10
mvi-architecture10
mvi-android10
kotlin-multiplatform10
Programming languages (2)
Github contributions (5)
robotoworks/composter
Jan 2017 - Sep 2020
Contributions:10 commits, 9 pushes, 1 branch in 3 years 8 months
Rosomack/SpekExamples
Nov 2017 - Feb 2018
Contributions:7 commits, 6 pushes, 1 branch in 2 months
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