Some of the stuff that I've done -
1. Implemented Linux thin-client system for 50 users 4 years ago with less than 1% downtime.
2. Implemented Exchange Mail system for 250 users 3 years ago. Users are located all over the world - server is located at company office in India. Less than 1.5% downtime (I have to work towards achieving this).
3. Linux mail server 2 years ago. No downtime yet.
4. Firewall - many installation using custom configuration.
5. WAN load-balancer - many implementations
Professional :
IT consulting
Systems Integration Solutions
Customised software development
Network security
Personal:
Reading
Music
Eating
Misc.
Teaching at Summer Camps