Mid/Senior Java Developer (Banking/Fintech)

We are looking for a Mid/Senior Java Developer to join a long-term fintech / banking project. The role involves designing and developing scalable backend solutions using Java 21 and Spring Boot , working within a microservices architecture , and ensuring high performance and reliability of backend systems. The ideal candidate brings hands-on experience with REST API development, cloud environments ( AWS ), and modern DevOps practices, and holds valid residency in Lithuania, Latvia, or Estonia (citizenship required; background check applies). Key Responsibilities: Design and develop scalable, high-performance backend systems using Java 21 and Spring Boot Build and optimize REST APIs following best practices in software architecture Work within a microservices architecture , ensuring modularity and maintainability Manage builds and dependencies using Gradle Write and maintain automated tests using JUnit , Mockito , and AssertJ Ensure code quality through SonarQube analysis and code review processes Work with GitLab for version control and CI/CD pipeline management Containerize and deploy services using Docker on AWS Implement logging with Logback / SLF4J and monitor systems via Grafana Handle asynchronous event-driven communication using Kafka Work with PostgreSQL as the primary database and Redis for caching Apply strong security principles and best practices throughout the development lifecycle Collaborate closely with cross-functional teams in an agile environment Must-Have Requirements: Proven professional experience in Java development with a strong technical background Proficiency in Java 21 and Spring Boot Experience with Gradle as a build and dependency management tool Hands-on experience with JUnit , Mockito , and AssertJ for testing Familiarity with SonarQube for code quality assurance Solid experience with GitLab and CI/CD pipelines Experience with Docker containerization Hands-on experience with AWS cloud services Knowledge of Logback and SLF4J for logging Experience with Grafana for system monitoring Working knowledge of Kafka for messaging and event streaming Proficiency with PostgreSQL and Redis Expertise in solution design and microservices architecture Strong understanding of security principles and best practices in software development Knowledge of DevOps practices and related tooling Strong problem-solving and analytical skills with a collaborative mindset Lithuanian, Latvian, or Estonian citizenship (residency requirement; BGC required) Fluency in English Nice to Have: Prior experience working on fintech projects