React, Typescript, PostgreSQL, Node.js, Rest Apis, Next.js, object-oriented programming, AI coding tools, automated tests, asynchronous processing

Spring Boot, Java, AWS, Fault Tolerance, Cloud Infrastructure, Relational Databases, system design fundamentals, JVM-based backend frameworks, distributed transactions, event-driven architecture, alerting, container-based deployments, observability, Caching, message queues, idempotency