I did big online systems, for example 4share(DOT)vn, phim(DOT)4share(DOT)vn, chooto(DOT)com(DOT)vn, erportal(DOT)vn...
- Streaming Video System
- FileHosting System
- Server Hosting System
- Virtualization System
- Clouding Data System.
...
Big online system is my work, with thoudsand users online concurrently, hundred serveronline, hundered Gigabit Throughput of network, with billing system very complex, absolute exact, and very stable, anti hacker, cracker, DOS, DDOS...