Szymon Marcinkiewicz
Software Engineer (Backend) at Revolut
Wrocław, Lower Silesian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolSzymon Marcinkiewicz is a backend-focused software engineer with 10 years of experience building highly scalable JVM-based web applications in Java, Kotlin and Scala. He progressed from internships and freelance work to senior backend roles at Allegro and now contributes to platform engineering at Revolut, bringing production-grade expertise in distributed systems and messaging. At Allegro he worked on Hermes, a Kafka-based message broker, improving retransmission APIs and console UX to make time-based replays more reliable and testable. Based in Wrocław, he combines strong academic foundations in computer science with hands-on experience across e-commerce and fintech, and a penchant for polishing both APIs and developer-facing consoles.
10 years of coding experience
8 years of employment as a software developer
Master's degree Informatyka, Master's degree Informatyka at Polish-Japanese Academy of Information TechnologyEngineer's degree Informatyka, Engineer's degree Informatyka at Wrocław University of Science and Technology
English, German, Polish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
javas10
api-rest10
rest-api10
kafka10
api-design10
restful-api10
java10
testng10
testing10
spring-boot9
json8
Programming languages (4)
Github contributions (5)
allegro/hermes
Oct 2021 - Oct 2022
Fast and reliable message broker built on top of Kafka.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:112 releases, 156 reviews, 89 commits in 1 year
Contributions summary:Szymon primarily focused on modifying the `/retransmission` endpoint to accept `OffsetDateTime`, updating the date/time picker in the Hermes console and adding related tests. They modified the `SubscriptionsEndpoint` to handle the retransmission. The changes involved updates to the `KafkaRetransmissionServiceTest` to ensure proper functionality. Furthermore, the user has been involved with making the console interface more functional, including the time selection of retransmission dates.
kafkamessage-brokerhermespubsubmessaging
allegro/mongo-migration-stream
Jul 2023 - Oct 2024
Tool for zero downtime migrations of MongoDB databases.
Contributions:4 releases, 7 reviews, 42 PRs in 1 year 3 months
mongodb-databasekotlinmongomongodb
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