Bartosz Walacik
Senior Consultant Software Engineer at JaVers
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolBartosz Walacik is a senior software engineer and team leader with over two decades of experience designing high-performance, highly available web systems and data pipelines. He brings backend-heavy full-stack expertise—especially in the Java ecosystem and databases—alongside solid JavaScript and Python skills, and a pragmatic focus on metrics, scalability and observability. As creator and lead of the JaVers open-source project he has deep hands-on experience with object auditing and diffing for Java, and he actively shares engineering insights through conference talks and Allegro Tech blog posts. He has led engineering teams at large-scale e-commerce and data platforms (Allegro, Snowflake) and now consults at Visa, combining architecture-level thinking with day-to-day delivery. Known for translating complex business requirements into auditable, production-ready solutions, he prefers only senior-level opportunities that leverage both technical leadership and coding.
13 years of coding experience
10 years of employment as a software developer
Master degree, Software Engineering, Statistics and Data Mining, Master degree, Software Engineering, Statistics and Data Mining at Polish-Japanese Academy of Information Technology
English
Stackoverflow
3,456reputation
150kreached
238answers
2questions
java
top-5%
spring-boot
top-5%
Github Skills (14)
javas10
object-oriented-programming10
java10
testing10
spring-boot9
maven6
hibernate-envers6
hibernate6
auditing6
mongodb6
spring-data-jpa6
postgresql6
spring6
spring-data-rest6
Programming languages (9)
Github contributions (5)
javers/javers
Jul 2013 - Jan 2023
JaVers - object auditing and diff framework for Java
Role in this project:
Back-end Developer
Back-end DeveloperContributions:43 reviews, 2178 commits, 849 PRs in 9 years 7 months
Contributions summary:Bartosz contributed to the Javers project, specifically focusing on object auditing and diff framework for Java. The commits show the implementation of features related to identifying and comparing object changes, including the integration with data structures like lists, sets, and maps. Furthermore, they are responsible for fixing bugs, refactoring components, and writing tests to improve functionality and reliability of the core features.
java
allegro/vending-machine-kata
Apr 2014 - May 2014
vending-machine
Contributions:46 commits in 1 month
vending-machine
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