Mid Integration Developer (Java)

Quick Facts

Hybrid work model in Warsaw (3 days in office, 2 days remote). B2B cooperation provided from within Poland.

Description

Join a team delivering digital transformation in the financial sector by building integration services and APIs supporting a key business area. As a Mid Integration Developer, you will design, implement, and maintain integrations between systems and co-create solutions running in a microservices architecture, with focus on APIs, asynchronous integration, and orchestration.

Responsibilities

• Design, implement, test, and maintain integration flows and APIs according to requirements and Definition of Done.
• Participate in technical decision-making for integration and API implementation, considering applicable architectural standards.
• Ensure quality, security, availability, and performance of delivered solutions, including diagnosing and removing root causes of issues.
• Collaborate with architects, analysts, Product Owners, and project teams to refine requirements and align on solutions.
• Take part in estimation, planning, and analysis of technical risks.
• Support the team in solving technical problems and share best practices.
• Regularly contribute to code reviews and develop code quality standards and automation.

Requirements

• Minimum 4 years of commercial experience building applications in Java, including practical work with Java 21+ and Spring Boot (Spring Cloud and Hibernate are welcome).
• Experience designing and implementing system-to-system integrations and APIs using REST, JSON, OpenAPI, OAuth 2.0 and JWT, plus SOAP and XML.
• Experience building asynchronous integrations using Apache Kafka, RabbitMQ, or another message broker.
• Experience integrating with API Management platforms (publishing and securing APIs).
• Experience with microservices architecture and deploying solutions to Kubernetes.
• Practical CI/CD experience (Bamboo or Jenkins), working with Git/Bitbucket repositories and Jira.
• Experience creating unit tests and using Java testing frameworks.
• Experience with PostgreSQL or Oracle databases, including creating and optimizing SQL queries.
• Documented independence in troubleshooting and making technical decisions.

Benefits

• Hybrid model in Warsaw (3 days office, 2 days remote).
• Space for development in API, asynchronous integration, and orchestration, with gradual assumption of end-to-end responsibility.