JOB DESCRIPTION: 
4z.com is looking for a motivated and experienced VoIP Developer for an immediate hire as a freelancer. The Company is seeking a professional with knowledge of mathematics. 4z.com requires not only coding skills but analytical thinking skills and experience in processing of large data sets and in optimization of algorithms.
RESPONSIBILITIES: 
- Participate in all operational processes;
- Analyse the current network;
- Optimize the network infrastructure;
- Generate statistics;
- Analyse network data;
- Develop fraud detection and prevention systems;
- Develop new monitoring systems;
- Compare various telephony systems and stress tests;
- Generate large number of calls for stress tests;
- Compare and diagnose various VoIP billing solutions;
- Benchmark various voice and video codecs;
- Participate in the development of new services.
REQUIRED QUALIFICATIONS: 
- PhD or master's degree in Computer Science and Telecommunication is welcomed;
- Programming/ coding skills (average of several thousand lines per project);
- Knowledge and/ or experience in programming with C and C ++;
- Knowledge and/ or experience in scripting with Bash, Perl, Python and PhP;
- Knowledge and/ or experience in databases: MySQL;
- Knowledge of UNIX/ Linux servers-network administration: IP protocol (TCP/ UDP), IP address/ IP routing and sockets;
- Knowledge and/ or experience in VoIP: SIP, Asterisk, FreeSWITCH and Kamailio-Traffic Analysis Tools: ngrep and wireshark;
- Knowledge and/ or experience in Redundancy, cluster and cloud concepts;
- Knowledge of DNS, IMAP, SMTP, LDAP and Dovecot;
- Working knowledge of French and English languages;
- Motivated, organized, dynamic person with a common sense, analytic thinking and fundamental knowledge;
- Ability to concentrate on the current project;
- Will to complete own projects;
- Ability to document own work.
APPLICATION PROCEDURES: 
All interested candidates are welcome to send their CV and a motivation letter to:
****@**.*** . Please, indicate the position title, your name and surname ("[2'i58'1 developer] Name Surname") in the subject line of the email.
Please clearly mention in your application letter that you learned of this announcement through Career Center and mention the URL of its website - www.careercenter.am. Thanks.
REMUNERATION/ SALARY: 
Competitive
OPEN TO/ ELIGIBILITY CRITERIA: 
All interested candidates