Sercan Haydaroglu

Java Software Engineer @Goldbach Group AG

Berlin, DE

Designed and implemented key backend services using Java 17/21, Spring Boot, PostgreSQL, MongoDB, GraphQL Kafka, AWS S3, AWS SQS/SNS, ensuring high performance and scalability- Developed and deployed integrations with external systems, enabling seamless booking system, ad handling, spot uploads, and ad monitoring- Built a robust ad validator for print ads, improving data quality and reducing operational errors- Improved code quality and maintainability by introducing SonarCloud checks and strengthening unit test coverage- Designed retry logic for booking workflows without introducing new states, optimizing reliability- Collaborated closely with cross-functional teams and onboarded new engineers, contributing to knowledge-sharing and team growth.