• Design, build, and maintain microservices using Spring Boot and Java 19, ensuring reliability, scalability, and maintainability • Develop and integrate RESTful and GraphQL APIs for internal and external use • Architect and implement multi-tenant systems, data isolation layers, and complex authorization mechanisms • Optimize database performance, schema design, and query efficiency in PostgreSQL environments • Implement event-driven architecture using AWS messaging services (SQS, SNS) or equivalent • Contribute to system-wide architecture and design reviews, proposing solutions for scalability and performance • Implement and maintain secure authentication and authorization flows using OAuth2, JWT, and Spring Security • Ensure compliance with enterprise-grade security standards, including encryption, data privacy, and audit logging • Conduct performance tuning, profiling, and load testing across services • Collaborate with frontend, DevOps, and product teams to define APIs, integration flows, and release strategies