C, C++, Product Architecture Design, Design and Development of Product Framework, Linux, Kernel Module Development, Network Security, Deep Packet Inspection ( DPI ), Data Plane Development, Object Oriented Programming Concepts ( OOPs ), Multi-threaded Programming, Signal Handling, Semaphores and Mutexes, Inter-Process Communication, Socket Programming, Cross Platform Development, Bash Shell Script, Sed, AWK, knowledge of TCP, IP, UDP, ICMP, DNS, HTTP protocols, Perforce, CVS ( Versioning Systems ), Valgrind, GDB ( Debugging tool ), Code Debugging, Bug fixing, Makefiles, Design & Development of Algorithms, Data Structures, Gnu Tool Kit ( GTK ), Regular Languages and Finite State Machines ( FSM ), XML, Protocol Analyzers / Parsers, Data Analyzers / Parsers, RAGEL, PCRE, OS Hardening of GNU / Linux, Computer Forensics, The Sleuth Kit ( TSK ), Assembly Language