Senior Java Developer

Java

N/A, Warszawa

B2Bnetwork

135 - 165PLN

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: 10.08.2025

Office location