Ipsec, Nat, Dns, SSL, BGP, Vlans, DHCP, Network Drivers, Routing Protocols, OSPF, Python, Go, L2 L3 stateful firewalls, Pim, Linux kernel-based networking, DTLS, QUIC, Gre, WireGuard

AWS, Distributed Systems, Storage Systems, Java, Python, Golang, Kafka, caching strategies, query performance