I am a Certified Software Development Engineer. I know following programming language. In addition, I have following skills. (1)Firewall, Gateway, HA, VPN(OpenVPN, PPTP, L2TP, IPSec), IPS/IDS, WebFirewall, Wifi, Routing, Proxy(Nginx, Squid, apache plugin), DPI(OpenDPI, Qosmos) (2)Sophos(Astaro), AWS, VPS, cPanel/WHM (3)Linux, Windows, iOS APP development (4)Linux Server Constructions/Management (5)Mysql, Postgresql, Oracle, MSsql (6)Multi-Threading,Scheduling (7)Protocols(http/https, smtp/smtps/starttls, pop3/pop3s, imap/imaps, ftp, imp, nfs, smb/cifs, icq, msn, yahoo, gtalk) (8)Cryptography(AES, DES, RSA, SSL, TLS)