Sergiusz Jańczura
Java Developer | Poznań
I am a Java Developer with many years of experience in building and maintaining complex backend applications. I currently work at Hummerce (formerly Best.net), where I am responsible for developing a large-scale e-commerce platform powering multiple online shops across different markets. My work involves designing scalable solutions, optimizing performance, and integrating with external systems — including ERP/CRM platforms, payment providers, and marketing tools.
In my free time, I enjoy playing computer games, swimming, and keeping up with the latest tech trends. I’m passionate about creating stable, well-optimized systems that meet the needs of rapidly growing businesses. I also like to explore lower-level programming — currently learning Rust.
Java Developer @ Hummerce (03.2020 - Current)
Tester @ Hummerce (10.2019 - 03.2020)
Game Tester/Designer @ FabrykaGier (07.2018)
Master of Computer Science 2020 - 2021 (Adam Mickiewicz University)
Bachelor of Computer Science 2013 - 2019 (Adam Mickiewicz University)