Query Optimization, API design, Java, Replication, Kafka, MLops, Cassandra, Nosql, REST, PostgreSQL, Data Modeling, Microservices, AWS, Schema Design, Oracle, Data Governance, Graphql, MongoDB, Indexing strategy, Data pipelines, Lakehouse patterns, Streaming ingestion, Partitioning, Sharding, Warehousing, GRPC, Infrastructure as Code, Event-driven architectures, Observability tooling