Algorithms, Design Patterns, Web Services, data structures, Software Development Life Cycle, Testing, Coding Standards, object-oriented concepts, designing building operating and managing large-scale distributed systems, build processes, operations, high volume transactional and distributed system environment, retail E-commerce, code reviews, software programming language, source control management

High Availability, identity management systems, DevOps practices, event-driven architectures, fault-tolerant systems, complex state management, cross-regional data consistency, Security Protocols, asynchronous processing patterns, distributed transaction management, scalable detection and fraud prevention systems, cache invalidation strategies