Bartłomiej Graczyk
Senior Software Engineer at Allegro
Warsaw Metropolitan Area Poland
Summary
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Senior🎓
Top SchoolBartłomiej Graczyk is a Senior Software Engineer at Allegro with five years of experience building and operating high-throughput backend systems for e-commerce. He owns the delivery method selection critical path—designing low-latency, fault-tolerant decision engines that influence millions of daily checkouts and withstand traffic spikes like Black Week. Proficient in Java, Kotlin and Spring Boot, he specializes in distributed systems, microservices and hexagonal architecture while embracing "you build it, you run it" operational ownership. He has a track record of bridging warehouse automation and customer-facing services, creating extensible delivery-rule architectures and resilient fallback patterns that preserve conversion under partial outages. Based in the Łódź/Warsaw area, he combines pragmatic engineering with deep domain knowledge of logistics and real-time pricing.
5 years of coding experience
4 years of employment as a software developer
Bachelor of Engineering (B.E.), Computer Science, Bachelor of Engineering (B.E.), Computer Science at Lodz University of Technology
Polish, English
Github Skills (8)
human-readable10
internationalization10
java9
database8
backend3
hibernate2
maven2
postgresql1
Programming languages (3)
Github contributions (5)
bartlomiejgraczyk/sound-id
Nov 2025 - Apr 2026
Contributions:5 reviews, 2 PRs, 24 pushes in 5 months
graczyk-florczuk/distributed_programming
Nov 2020 - Jan 2021
Repository as a part of the laboratory passing in the subject "Distributed programming" at the Lodz University of Technology. Authors: Bartłomiej Graczyk (224301), Paweł Florczuk (224293).
Contributions:4 releases, 2 PRs, 36 pushes in 2 months
pythonsubjectlaboratorybartdistributed-programming
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