SLO • Availability • Organization, Technical Leader, Onboarding • Monitoring, Observability • MLOps • Cloud Billing • Release Engineering • Design Doc • Stress Test, Capacity Planning • Microservices • Scale Database(Kafka, Cassandra) • gRPC • Core • Distributed Systems • Distributed File System • Security Control • Elasticrsearch • Python Global Interpreter Lock(GIL) • Distributed Consensus • Edge Computing • Networking, TCP, BGP • Memory Management • ARM64 • Java Garbage Collector • HBase