Ratko B.
NisSerbia
100% Job Success
Top Rated

Network System Engineer

I have 30-years experience in network projects including design, implementation, system administration and in software development. For the first 5 years of my career I worked on software development: coding and especially testing. For the last 25 years I'm working on implementation and maintenance of University of Nis WAN. Last 20 years I'm deeply involved in AMRES (Academic Network of Serbia) project. Don't fix it if it ain't broken, don't break it if you can't fix it! SKILLS SUMMARY - Any system administration tasks - Operating Systems: any *nix (Linux, FreeBSD, SGI IRIX, SCO, Solaris, OSX), Windows 3.1/9x/Me/XP/Vista/W7/W8/W10, WinServer NT/2K/2003/2008/2012/2016 - LAN & WAN: Ethernet, Fast Ethernet, Gigabit Ethernet, FDDI and Wireless LANs. T1/T3, SDH/SONET, Frame Relay, WDM, ISDN, ADSL, SHDSL, Cable Modems, Cellular, X.25. - Network Protocols: TCP/IP, IPv6, UDP, OSI, CDP, IP Multicast, IPSec, VoIP, Routing, VLANs, Bridging, Trunking, VPN, SNA, DLS - Network Services & servers: SMTP/POP3/IMAP, FTP/SFTP, Telnet/SSH, HTTP/HTTPS, DNS, DHCP, NNTP, NTP, LDAP, SNMP, NETBIOS, Apache, Nginx, MySQL, Plesk, cPanel, Zimbra, VMware, CentOS, Ubuntu, Debian - Network Equipment: various types of modems, firewalls, switches and routers. - Dedicated, VPS and cloud environment servers (Amazon AWS, Google Cloud, MS Azure, Digital Ocean, Linode). - Programming Languages: Unix Shell scripting, BASH, C, Pascal, MS Visual Basic, PHP, HTML, (a bit of Python).
Work history

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Skills

Skills

  • Zimbra Administration
  • Let's Encrypt

Testimonials

Endorsements from past clients

"I have been fortunate enough to work with Ratko for several years & it has been an absolute pleasure to work with him. He is very knowledgeable in the Network & Systems administration areas. He has a high level of communication, an excellent rapport with everyone on our team and always a positive solution-oriented attitude. I trust Ratko at the highest level to not only ensure things are done properly but to also be proactive and suggest changes or alternatives to all of our ideas/solutions. Ratko has a high level of understanding of the existing infrastructure we work with and he is also constantly expanding that understanding with new concepts and tools in our digital environment. I give Ratko the highest recommendation possible for any Network & Systems position. "

Joey G. | CEO
IT Consulting and SysAdmin tasks Feb 2020

Verified


"I've lost track of how long I've worked with Ratko, it's been years at this point, and he has been absolutely invaluable to my business. He joined me when I was in the midst of a difficult server migration and handled everything with expertise. He is always timely in his responses, is a great communicator and regularly goes above and beyond when he sees things that needed to be fixed or changed. I HIGHLY recommend Ratko. He's a pleasure to work with and highly knowledgeable."

Jeff F. | Creative Director
IT Consulting and SysAdmin tasks Feb 2020

Verified


"Ratko is a fantastic freelancer. I can only recommend his services to anyone. His communication skills are as top-notch as his competency. No doubt I would hire him again would the need arises. Thanks"

Guillaume B. | CEO
IT consulting & sysadmin tasks Feb 2020

Verified


"We are working with Ratko since 2015. He is maintaining all our Linux servers and applications since then. Ratko has a very broad skillset. He's managing our webservers, mailserver as well as several other applications. Most of them are crucial for us. During all the years Ratko has always shown the very high reliability and the shortest possible reaction time. He is truly giving us peace of mind concerning our servers so that we're able to focus on our core business. I can recommend Ratko to 100%. "

Phillip S. | CEO
Servers - IT maintenance Feb 2020

Verified