April 8, 2026
Senior Java Developer
Senior • Remote
120 - 135 PLN
Warsaw, Poland
Senior Backend Engineer (Java/Kotlin)
We are looking for an experienced Backend Engineer to join a team building modern, scalable systems based on a microservices architecture. This role offers real influence over technical decisions, system architecture, and the quality of delivered solutions—particularly within payment and subscription platforms.
Responsibilities
Design, develop, and maintain backend systems using Java or Kotlin and the Spring Framework
Build and evolve microservices following DDD, CQRS, and Hexagonal Architecture principles
Implement event-driven communication, ideally using Apache Kafka
Work with relational databases (PostgreSQL or other SQL databases) and optimize queries
Write unit and integration tests using JUnit, Mockito, and Testcontainers
Contribute to the design and development of cloud-based solutions (AWS or GCP)
Participate in code reviews and drive high engineering standards
Collaborate closely with product and engineering teams to deliver business-critical features
Requirements
Strong experience with Java and/or Kotlin
Solid knowledge of Spring / Spring Boot
Hands-on experience with SQL and relational databases (preferably PostgreSQL)
Proven background in microservices-based architectures
Experience with event-driven systems (Kafka is a strong plus)
Practical experience with backend testing (JUnit, Mockito, Testcontainers)
Experience working with cloud platforms (AWS or GCP)
Good understanding of Domain-Driven Design (DDD), CQRS, and Hexagonal Architecture
Must-have: experience with payment systems and/or subscription-based platforms
Nice to Have
Experience working with high-scale, high-availability systems
Knowledge of security and transactional data handling
Background in product-driven, Agile environments
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