Senior API Developer – Java & Cloud Services

Our requirements

• At least 5 years of hands-on experience building APIs and backend services in Java.
• Strong expertise with Spring Boot and Maven.
• Solid understanding of backend architecture concepts including service design, data access, caching, and resilience.
• In-depth knowledge of API styles and integration patterns (REST, GraphQL, SOAP).
• Experience working with API tooling such as Postman, Swagger UI / OpenAPI, SoapUI.
• Ability to work with data formats like JSON and XML.
• Proven troubleshooting skills to diagnose issues, fix defects, and enhance performance and reliability.
• Strong collaboration skills and ability to communicate technical decisions effectively.

Optional

• Experience with event-driven architecture at scale (Kafka streams, schema registry, idempotency, exactly-once/at-least-once).
• Familiarity with AWS services like Kubernetes/EKS, Fargate, Redis, RDS, S3, Route 53.
• Knowledge of CI/CD pipelines, observability tools (logging, metrics, tracing), and secure coding practices.
• Strong critical thinking and a pragmatic, delivery-focused mindset.

Your responsibilities

• Build and evolve high-performing, scalable APIs and backend services using Java, Spring Boot, and Maven (developed primarily in IntelliJ).
• Collaborate with cross-functional teams, including engineers, product owners, architects, and testers, to deliver robust services aligned with business needs.
• Design APIs following industry standards (REST, GraphQL, SOAP), ensuring versioning, backward compatibility, and optimal consumer experience.
• Integrate with third-party and internal APIs, ensuring resilience, observability, and clear error handling.
• Develop and support event-driven services utilizing Kafka, managing topic design, schema evolution, and message reliability.
• Deploy cloud-ready services on AWS, including Kubernetes / EKS, Fargate, Redis, RDS, S3, Route 53, with consideration for deployment and runtime environments.
• Maintain product quality through automated testing, regular API testing, and troubleshooting live issues with a "you build it, you run it" approach.
• Produce comprehensive API documentation using OpenAPI/Swagger and supporting runbooks as necessary.
• Contribute to engineering standards around security, performance, maintainability, and continuous improvement.

About the project

This is how we organize our work

This is how we work on a project

• Continuous Deployment
• Continuous Integration

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What we offer

• Stable and long-term cooperation with very good conditions.
• Enhance your skills and develop your expertise in the financial industry.
• Work on the most strategic projects available in the market.
• Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years.
• Participate in Social Events, training, and work in an international environment.
• Access to attractive Medical Package.
• Access to Multisport Program.
• Access to Pluralsight.
• Flexible hours.

Benefits

• sharing the costs of sports activities
• private medical care
• remote work opportunities
• flexible working time
• fruits
• integration events
• corporate gym
• saving & investment scheme
• no dress code
• coffee / tea
• drinks
• christmas gifts
• birthday celebration
• sharing the costs of a streaming platform subscription
• access to +100 projects
• access to Pluralsight

Recruitment stages

• 1.
  online interview
• 2.
  online interview

ITDS Polska Sp. z o.o.