Jarosław Wieczorek
Owner at Umbrella Limited
Greater Poland Voivodeship
Summary
👤
Senior🎓
Top SchoolJarosław Wieczorek is a seasoned backend engineer and founder with nine years of focused experience building robust, test-driven REST APIs and scalable microservices. He has driven platform and performance improvements at classifieds leaders like OLX Group and Naspers/Grupa Allegro, working across Symfony/PHP, Kotlin/Spring, RabbitMQ, SOLR and caching layers such as Redis and Memcached. As owner of SHD and a senior developer at Umbrella, he combines hands-on implementation with system design and CI/CD practices, often delivering customer-facing integrations and bulk-offer management solutions. Known for applying SOLID principles and TDD in real-world high-traffic systems, he also has practical experience with AB testing, search tuning, and multi-datacenter operations. Based in Greater Poland, he blends entrepreneurial grit with deep domain knowledge of classifieds platforms and long-term stewardship of production services.
9 years of coding experience
13 years of employment as a software developer
Master of Science (MSc), Informatyka, Master of Science (MSc), Informatyka at Politechnika Poznańska
Polish, English
Stackoverflow
155reputation
4kreached
7answers
6questions
Github Skills (65)
modbus-tcp9
file-format9
perl9
struct9
graphviz9
baidu9
network-tools8
cpp8
parser8
python8
lua8
kaitai-struct8
reverse-engineering8
php8
keras8
Programming languages (5)
Github contributions (5)
jaroslaw-wieczorek/gamepad-hama-urage-auto-configurator-for-linux
Apr 2020 - Aug 2024
Contributions:5 pushes, 1 branch in 4 years 5 months
jaroslaw-wieczorek/PyMessageChat
Jul 2018 - Mar 2025
Contributions:18 PRs, 92 pushes, 13 branches in 6 years 9 months
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