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WISE INTEGRATION

Mid/Senior Java Developer (Banking/Fintech)

WISE INTEGRATION · €62K–€104K/yr

IT Services and IT Consulting · 2-10 employees

19 h ago
Remote Senior (5-10 yrs) Contractor
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About the role

Design and develop scalable, high-performance backend systems and REST APIs using Java 21 and Spring Boot within a microservices architecture. Manage the full development lifecycle including containerization with Docker, deployment on AWS, and system monitoring via Grafana.

What they look for

Java 21 Spring Boot Microservices REST API AWS Gradle JUnit Mockito AssertJ SonarQube GitLab CI/CD Docker Kafka PostgreSQL Redis Grafana

Requirements

Requires professional experience in Java development, proficiency with the Spring ecosystem, and expertise in cloud services and DevOps tools. Candidates must hold citizenship and residency in Lithuania, Latvia, or Estonia and be fluent in English.

Full description

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).

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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

\n€30 - €50 an hour

Duration: Long-term with possible extension

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