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Senior Engineer II Amex GBT is a place where colleagues find inspiration in travel as a force for good and -- through their work -- can make an impact on our industry. We're here to help our colleagues achieve success and offer an inclusive and collaborative culture where your voice is valued. What We're Looking for: We are looking for a highly skilled Senior Java Developer with strong expertise in Java, Spring Boot, microservices, PostgreSQL, and AWS. The ideal candidate will have strong hands-on experience in designing, building, deploying, and supporting scalable backend applications and APIs in enterprise environments. This role requires deep experience in Java 11 , Spring ecosystem, REST API development, microservices architecture, and PostgreSQL database design and optimization. The candidate should also have solid exposure to AWS cloud services, especially ROSA (Red Hat OpenShift Service on AWS) and EC2, along with experience in Kafka, CI/CD, and production support. The ideal candidate must be capable of developing robust backend solutions, resolving complex production issues, and working effectively with cross-functional teams to deliver reliable and high-performing applications. What You'll Do: 1. Hands-on Development Design, develop, and maintain complex backend services and REST APIs using Java and Spring Boot. Architect and implement scalable microservices solutions for business-critical workflows. Build resilient, secure, and high-performing backend applications using enterprise Java patterns. Develop integrations with internal and external systems using synchronous and asynchronous communication patterns. Implement robust exception handling, logging, monitoring, and alerting in backend services. Participate actively in debugging, troubleshooting, and root cause analysis of complex application issues. Provide expert-level production support and ensure application stability and performance. 2. Application Design \& Engineering Practices Contribute to technical architecture and solution design discussions. Follow established design patterns, coding standards, and development best practices. Participate in code reviews and ensure adherence to quality, security, and maintainability guidelines. Work closely with product managers, architects, and stakeholders to understand business requirements and translate them into technical solutions. Contribute to continuous improvement in engineering practices, reusable components, and system reliability. 3. Database Design \& Performance Design efficient and scalable data models using PostgreSQL. Write optimized SQL queries and support data access layer implementation. Perform PostgreSQL performance tuning, query optimization, indexing, and database design improvements. Ensure high standards for data integrity, consistency, and transactional reliability. Support troubleshooting of database-related performance and production issues. 4. Cloud \& Platform Engineering Deploy and manage applications on AWS ROSA (Red Hat OpenShift Service on AWS). Manage and support workloads running on EC2 and cloud-native environments. Build and maintain containerized applications using Docker and Kubernetes/OpenShift. Implement cloud-native design principles for scalability, resilience, and maintainability. Collaborate with DevOps and infrastructure teams to improve deployment, runtime management, and environment stability. 5. Event-Driven \& Integration Architecture Design and implement integrations using Kafka and event-driven architecture principles. Build backend services that support asynchronous communication and distributed processing. Ensure reliability, scalability, and observability of event-driven workflows. 6. Process \& Delivery Participate in sprint planning, technical grooming, estimation, and delivery activities. Work closely with cross-functional teams to ensure smooth execution and timely delivery. Support agile development processes and continuous delivery practices. Follow established processes for development, release management, testing, and operational support. Contribute to documentation, technical knowledge sharing, and support procedures. Required Skills and Experience Minimum 5 years of professional experience in Java development. Expert-level proficiency in Java 8 / Java 11 and advanced programming concepts. Deep expertise in Spring Boot, Spring Framework, and enterprise Java application development. Strong experience in designing and building RESTful APIs and backend services. Proven experience in microservices architecture, including scalable and distributed system design. Advanced knowledge of PostgreSQL, including: database design query optimization indexing strategies performance tuning transaction handling Extensive experience with AWS cloud services, particularly: ROSA (Red Hat OpenShift Service on AWS) EC2 Strong hands-on experience with Docker, Kubernetes, and/or OpenShift. Experience with Kafka and event-driven architecture. Strong debugging, troubleshooting, and production support capability. Familiarity with monitoring and observability tools such as CloudWatch and ELK stack. Experience with DevOps practices, CI/CD pipelines, and infrastructure-oriented deployment models. Technical Environment Languages/Frameworks: Java 11 , Spring Boot, Spring Framework, Spring Security, Spring Data JPA Databases: PostgreSQL Architecture: Microservices, RESTful APIs, event-driven systems Cloud/Platform: AWS ROSA, EC2 Containers/Orchestration: Docker, Kubernetes, OpenShift Messaging: Kafka Build/CI-CD: Jenkins, GitLab CI/CD, Maven, Gradle Monitoring/Observability: CloudWatch, ELK Stack Preferred Qualifications Experience in high-scale enterprise application environments. Exposure to modern backend architectural patterns and cloud-native development. Experience working in container-based deployment environments. Familiarity with security best practices in backend application development. Experience in travel, booking, operations, or trans