Java Developer

Quick Facts

• Role: Java Backend Developer

• Focus: backend application design, scalability, event-driven architecture, security, and observability

Description

You will design, develop, and maintain advanced Java backend applications for a banking environment, delivering scalable solutions that handle high query volumes and text-file processing. The work includes building event-driven integrations using Apache Kafka, optimizing performance, and implementing security with PKI, TLS/mTLS, JWT, and digital signatures.

You will also work with Docker/Kubernetes, cloud services (preferred GCP), and CI/CD plus monitoring and troubleshooting.

Responsibilities

• Design, develop, and maintain advanced Java backend applications

• Build scalable, high-performance solutions for large numbers of queries

• Develop event-driven solutions using Apache Kafka

• Design and implement integrations between systems

• Optimize application and data-processing performance

• Create secure solutions using PKI, TLS/mTLS, JWT, and digital signatures

• Work with containerized environments and Kubernetes

• Perform monitoring, analysis, and troubleshooting of applications and environments

• Collaborate on architecture design and technical decision-making

• Use AI tools to support development, code analysis, and efficiency

Requirements

• 6+ years of commercial Java development and very good knowledge of Java 21/25

• 4+ years with PostgreSQL and Elasticsearch

• 3+ years with Apache Kafka and knowledge of Kafka Streams

• 4+ years with Spring Boot (2.3/2.4/2.6)

• Practical experience with Spring WebFlux, Jersey, Spring Cloud Gateway, Reactor Core, Resilience4j, Spring Security, Hibernate, Spring Data, Spring Cloud Sleuth, Micrometer

• Strong knowledge of design patterns and software best practices

• Knowledge of Enterprise Architect and UML

• Experience building systems that handle large numbers of queries and process text files

• Knowledge of Tomcat and Netty and HTTP-related topics

• Experience with Hazelcast and/or Ehcache

• Security knowledge: PKI, public-key cryptography, digital signatures, JWT, TLS, and mutual TLS (mTLS)

• Practical Docker and Kubernetes experience

• Cloud experience (preferred: Google Cloud Platform)

• CI/CD and developer tooling knowledge: Gerrit/Git, Zuul CI, JIRA, Maven, IntelliJ IDEA

• Observability tools: Prometheus, Grafana, Sentry, Loki

• Experience with AI development tools: GitHub Copilot and MCP (Model Context Protocol)

Benefits

• B2B collaboration model with project-based engagement tailored to your experience and preferences

• Contract contact person to support project coordination and next opportunities

• Opportunity to participate in selected trainings, certifications, and conferences (funding rules set individually)

• Option to apply for upcoming project qualification when interest or current-project period ends

• Community events (e.g., webinars) and optional initiatives

• Physical activity initiatives and access to training rooms

• Optional additional services such as private medical care, sports card, insurance, and psychological support

• Access to a cafeteria platform to choose benefits with allocated points