Full time freelance developer

We are looking for full time freelance developer to work for a VoIP company.
Skills:

-Programming: C, C ++
-Scripting: bash, perl, python, PhP
-Databases: MySQL
-Administration of UNIX / Linux servers-Network knowledge: IP protocol (TCP / UDP), IP address / IP routing, sockets
-VoIP: SIP, Asterisk, FreeSWITCH, Kamailio-Traffic Analysis Tools: ngrep and wireshark
-Redundancy, cluster, cloud concepts
-Knowledge of DNS, IMAP, SMTP, LDAP, Dovecot

Responsibilities;
You will participate in all operational processed such as:
Analysis of the current network
Optimization of the network infrastructure
Generation of statistics
Analysis of network data
Comparison of various telephony systems and stress tests
Generation of large number of calls for stress tests
Comparison and diagnostic of various voip billing solutions
Benchmark of various voice and video codecs
Participation in the development of new services