Senior Java API Developer (AWS + ECS)

Deloitte is hiring a Java Developer to support the development of enterprise-grade backend services and cloud-native solutions. The role involves building and maintaining REST APIs, integration services, and workflow-supporting applications running in AWS environments.

• 4+ years of professional experience in Java development
• Strong hands-on experience with Java and backend application development
• Experience designing, developing, and consuming REST APIs
• Practical experience with AWS cloud services
• Experience working with ECS Fargate or containerized applications deployed in AWS
• Experience working with relational and/or NoSQL databases
• Good understanding of Object-Oriented Programming (OOP) principles and software engineering best practices
• Experience with testing, debugging, and application performance optimization
• Familiarity with version control systems and CI/CD practices
• Strong analytical and problem-solving skills
• Ability to work both independently and within cross-functional teams
• Good communication skills in English and Polish at least B2+ level
• Valid EU work permit

Nice to have:

• Experience with microservices and distributed systems
• Experience supporting workflow orchestration, integration platforms, or middleware solutions
• Experience working with enterprise-scale APIs and integrations
• Understanding of event-driven architectures
• Experience in Agile delivery environments
• Knowledge of observability, monitoring, and operational best practices in cloud environments

• Developing and maintaining Java-based backend applications and microservices
• Building and enhancing REST APIs supporting enterprise integrations and channel services
• Developing services supporting workflow orchestration and system integrations
• Implementing and maintaining cloud-native solutions within AWS
• Working with containerized workloads deployed on ECS Fargate
• Collaborating with architects, developers, and business stakeholders to deliver scalable solutions
• Supporting system integration, testing, troubleshooting, and performance optimization
• Working with relational and non-relational databases supporting backend services and integrations
• Participating in code reviews and following engineering best practices, including CI/CD and automated testing
• Supporting platform reliability, scalability, and maintainability in distributed environments

Valid EU work permit required