Senior Java Developer

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