Senior Java Developer

135 - 165 PLNNet per hour - B2B

Senior Java Developer

Java

N/A, Warszawa

B2Bnetwork

135 - 165 PLN
Net per hour - B2B
Full-time
B2B
Senior
Hybrid

Tech stack

    English

    C1

    Java

    master

    Apache Kafka

    advanced

    SQL

    advanced

    Spring Boot

    advanced

    CI/CD

    regular

    Docker

    regular

    Oracle

    regular

Job description

We’re looking for a Senior Java Developer to support the development of business-critical backend services in a distributed, high-throughput architecture. The system is built on Kafka-based asynchronous communication and designed with a strong focus on performance, scalability, and reliability.

You will be involved in designing and developing clean, event-driven microservices, working closely with experienced engineers in an international, agile setup.

 

Tech stack

  • Java 11+, Spring Boot

  • Apache Kafka – producer/consumer optimization, retries, partitioning

  • SQL: Oracle / DB2 / MSSQL

  • Docker, Git, Maven

  • Microservices architecture

  • CI/CD pipelines

  • Domain-Driven Design (DDD), Event Sourcing

  • Monitoring: Splunk / Grafana (nice to have)


What we expect

  • 5+ years of experience in Java backend development

  • Strong hands-on skills in Kafka producer/consumer design and optimization

  • Solid experience in SQL and relational databases (Oracle, DB2, MSSQL or similar)

  • Proven background in building distributed, high-availability, high-performance systems

  • Practical understanding of DDD, Event Sourcing, microservices, and clean architecture

  • Fluent English for daily collaboration

Published: 26.08.2025
Office location
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