Os Internals, PostgreSQL, Networking, Avro, Garbage Collection, Distributed Systems, MySQL, Sockets, Oracle, Java, Apache Flink, concurrency, Apache Spark, Apache Kafka, Kubernetes, orc, Apache Iceberg, JVM internals, Data Lake architectures, Relational Databases, JVM performance tuning, Parquet, performance bottlenecks, Profiling, memory models, performance optimization