Role Description We are looking for a Senior Back-End Developer with strong Java expertise to join our engineering team and play a key role in designing, building, and scaling our enterprise back-end systems. You will architect and deliver high-performance APIs and data-intensive services that power our applications, working within a modern cloud-native stack built on GCP. You'll work across multiple Java versions, with a strong preference for Java 21, leveraging modern language features such as: - Virtual Threads (Project Loom) - Sequenced Collections - Record Patterns - Pattern Matching You will collaborate closely with front-end engineers, data engineers, and product teams to deliver robust, secure, and maintainable solutions in a fast-paced Agile environment. Responsibilities: - Design, build, and maintain scalable, high-performance back-end applications and APIs following RESTful principles and the OpenAPI Specification standards. - Implement and manage secure authentication and authorization flows using OAuth2 and related protocols. - Develop and optimize Spring Boot-based services and microservices, ensuring reliability, maintainability, and performance at scale. - Work proficiently across multiple Java versions (8, 11, 17, 21), advocating for incremental migration toward Java 21. - Write and optimize complex SQL queries and manage relational database schemas using PostgreSQL. - Build and maintain cloud solutions on GCP, leveraging native services for scalability and resilience. - Collaborate with data engineers on BigQuery and GCP data pipeline integrations. - Implement monitoring, alerting, and observability strategies for API-driven architectures. - Contribute to CI/CD pipelines and DevOps practices, including Jenkins and automated testing. - Collaborate cross-functionally in an Agile/Scrum or Kanban environment (sprint planning, code reviews, retrospectives). Qualifications - 3+ years of professional back-end development experience. - Deep expertise across Java 7, 8, 11, 17, and 21 - strong command of Java 21 LTS features (Virtual Threads, Record Patterns, Pattern Matching for switch). - Hands-on experience with Spring Boot and its ecosystem (Spring Security, Spring Data, Spring Cloud). - Strong hands-on experience with GCP cloud technologies. - Proven experience designing high-performance REST APIs with strong OpenAPI knowledge. - Hands-on experience implementing OAuth2 authentication/authorization. - Solid SQL proficiency with production PostgreSQL experience. - Strong understanding of microservices and distributed systems design. - Excellent problem-solving, analytical, and communication skills. - English proficiency at a minimum B2 level (Upper-Intermediate) for effective communication. Requirements - Experience integrating back-end systems with SAP platforms (SAP APIs, SAP data models). - Experience with Big Data technologies on GCP, including BigQuery and Apache Beam. - Hands-on experience with Docker containers and containerized development. - Experience in Data Modeling (relational and analytical). - Proficiency with automation/scripting, preferably Python. - Experience with CI/CD tooling such as Jenkins. - Familiarity with monitoring strategies (Cloud Monitoring, Prometheus, Grafana). - Experience across the full SDLC - requirements, design, delivery, and post-production support.