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Dmitry Sytchev

Dmitry Sytchev

Asterisk/Freeswitch/Kamalio expert, VoIP engineer,...

Russia - Last active: 12 days ago - Tests: 7 - Portfolio: 1

I have more than 10 years of experience in installation and support of carrier-grade VoIP services based on Asterisk, OpenSIPS, Kamailio, Freeswitch and proprietary SIP/VoIP software. My professional interests are Callcenters, automated dialer systems and integration of VoIP software with company information flows. You can rely on my strong engineering and programming skills for projects starting from single VoIP server to a complete wholesale/carrier VoIP solutions including billing, call data analysis, security and fraud prevention. I have developed complete SIP solutions for VoIP carriers worldwide: Proxy/Registrars, IVR, prepaid systems, multi-tenant VoIP switches, hardware PSTN gateways (Cisco AS5300/5500, Audiocodes Mediant 2000, Quintum Tenor). I have experience in setup, administration and security of Asterisk, FreePBX, Elastix and FreeSWITCH PBX installations. As a programmer I use PHP, Javascript (both client-side using jQuery and Angular.js and server-side with node.js), Perl (system scripts/applications, Mojolicious webapps). I also have experience in development and administration of MySQL and Microsoft SQL Server databases. I'm experienced network engineer, skilled in routing and switching, general network architecture planning and deployment, network monitoring and security, including HA solutions (heartbeat/pacemaker). I use Zabbix and have some experience with Nagios and other monitoring software. I can also offer you consulting support in VoIP and network technologies.

$33.33 /hr
86 hours
4.96
Cheryl Conant

Cheryl Conant

Graphic Designer

United Kingdom - Last active: 1 month ago - Tests: 1

Graphic Desiner looking for freelance projects to supplement my job at an advertising agency. I have obtained my M.A in Graphic Design & Art Direction as well as having undergraduate degrees in design and literature. I have extensive experience in branding and marketing, web design, UX, and have worked at a globally recognised packaging design agency and have received several design awards.

$33.33 /hr
35 hours
4.96
Pavel K.

Pavel K.

PHP Developer

Russia - Last active: 1 month ago - Tests: 12 - Portfolio: 5

I know what I'm doing and as a result, my work is of the highest quality. I'm an expert with a great experience in the following areas: PHP, Perl, MySQL, HTML (including HTML5), CSS (including CSS3), Javascript. Also I have experience in a lot of other areas, just tell me what you want.

$30.00 /hr
298 hours
4.94
Timur Birsh

Timur Birsh

Unix Systems Engineer

Kazakhstan - Last active: 21 days ago - Tests: 7

Hello, My goal is provide solutions to the clients. No matter how big or small your project. If you need to fix your problem by the professional engineer please do not hesitate to contact me. Please read below to get overview of my skills. Thank you. Over the last 13 years, I am working with the Unix systems FreeBSD, Solaris and Linux distributions including RedHat Enterprise Linux, CentOS, Oracle Linux, Debian and Ubuntu. I have developed a wide range of solutions: - DNS servers using BIND. - High availability DHCP servers using ISC DHCP software. - Web servers using Apache and nginx (LAMP stack). - Reverse proxies using nginx and Squid. - Mail systems using Postfix MTA and Courier mail server. - High availability file servers using Samba/CTDB/DRBD, NFS, OpenAFS, OCFS2. - Single sign on authentication/authorization servers using Kerberos and OpenLDAP. - VPN servers using OpenVPN. - High availability MySQL servers. - Internet gateways/firewalls under Linux/FreeBSD using iptables/ipfw. - Application level load balancers using nginx. - Monitoring servers using Nagios, Icinga, Munin, MRTG, Graphite. - Backup servers using Bacula. Oracle Database administration under Solaris, Linux and Windows. Virtualization: - KVM / LXC / Xen / VirtualBox / AWS. - VM images customization and troubleshooting. - VM provisioning automation. - libvirt, libguestfs, cgroups. High availability Linux systems using Pacemaker/Corosync. Over 10 years of experience in programming for Linux: - C, Pascal - bash, POSIX shell, Perl, Python. - lex/yacc. - make, autotools. Source code management tools: - Git. - SVN. - CVS. Over 4 years of experience in the GE Smallword administration. Over 60 Smallworld servers. High availability datastores. Scripts development for complex text processing using Unix shell, sed and awk. I am Debian Project Contributor. Please take a look at http://qa.debian.org/developer.php?login=taem@linukz.org.

$33.33 /hr
13 hours
4.97
Luis fernando A.

Luis fernando A.

Linux Sysadmin and AWS Architect with huge web hos...

Brazil - Last active: 1 month ago - Tests: 5

I'm a creative and hardworking Linux System Administrator and Amazon Web Services Architect and developer. I've been supporting and delivering IT solutions especially for web hosting companies and its set of open source software (Apache, PHP, RoR, MySQL, HAproxy, iptables, OpenVPN and much more) since 2005. I've also worked at IBM managing a farm of more than 1000 Linux and AIX servers as well as its proprietary middleware (DB2, IHS, WebSphere and others).

$50.00 /hr
24 hours
5.00
Omar K.

Omar K.

Cognos Business Intelligence (BI) profetional

Canada - Last active: 1 month ago - Tests: 1

IBM certified Cognos BI Administrator with over 8 years of experience in IT industry. I have hands on experience with the following Cognos BI tools: - Cognos series 7 - Cognos 8 - Cognos 10 I am experienced with Cognos environment migration from Series 7 to Cognos 8 and to Cognos 10 as well as from Cognos 8 to Cognos 10. I manage multiple large projects including Cognos BI environment migration, capacity planning and sizing, installation and configuration, performance tuneup. deployment releases. My goal is to keep leading Cognos BI projects more efficiently and keep managing Cognos BI environments. Specialties: IBM Cognos BI tool: - Administration - Installation and Configuration - Capacity planning - Environment architecture design - Environment management - Migration Cognos BI Project Management Cognos BI Consulting

$77.78 /hr
29 hours
5.00
Declan G.

Declan G.

15 years Microsoft Access database design and deve...

United Kingdom - Last active: 5 days ago - Tests: 12 - Portfolio: 2

As a problem solver, I have designed and developed easy to use office, school, college & library management systems with Access. If you want to be in control of your data, I can provide the tables, queries, forms and reports to make your daily business tasks as you envision them. Get things done efficiently. See your progress with every record added. I can provide the results you need. With 15 years experience and ever increasing adoration of MS Access I create time and money saving solutions. I have achieved top 10% test results for MS Access (among others) in oDesk and Elance. I have closely watched MS Access at every level and love producing small or complex but always effective database solutions for busy small organisations. Long live MS Access!!!

$30.00 /hr
11 hours
4.86
Anatoly Alekseev

Anatoly Alekseev

Analyst and programmer

Russia - Last active: 12 days ago - Tests: 47 - Portfolio: 7

Expert in VBA/Excel/Visual Basic 6/SQL, interested in Cuda, Python. Have some C++ and ASM experience. I'll be glad to help with: Optimization and automating of business-processes. Developing of decision support systems, E-commerce systems, including data interchange between Ebay/Amazon/SmugMug/ custom CRM systems. Web scraping/crawling, automated retrieval of weakly-structured data. Implementing methods of artificial intelligence (expert systems, artificial neural networks, genetic algorithms),data mining. Natural language processing tasks (intellectual textual search, natural language generation, etc). Imitational modeling (especially financial models, gaming), prediction of complex systems. Distributed applications, high performance computing (scientific computations), cloud computing (Azure/Amazon). Software reverse engineering.

$55.56 /hr
15 hours
4.99
Daniel Yavorovich

Daniel Yavorovich

System Administrator

Ukraine - Last active: 6 days ago - Portfolio: 1

Operating Systems ● FreeBSD ● Linux Security ● iptables ● openssl ● jail ● clamav ● mod_security ● mod_clamav DNS ● Bind ● PowerDNS (+PostgreSQL / +MySQL) HTTP ● Apache ○ MPM: prefork, worker ○ mod_ssl, mod_php, mod_wsgi ● Nginx ○ Access control ○ Autoindex ○ Fast-CGI ○ uWSGI ○ Proxy ○ Cache ○ SSL ○ upload_progress_module ○ Control panel integration ■ Virtualmin ■ DirectAdmin ■ Plesk Proxy ● squid ○ basic auth ○ transparent proxy ○ cache ● 3proxy ○ http/socks ○ auth Raid ● Linux ○ md(0,1,5,6,10) ● FreeBSD ○ Gmirror / Striping File Systems: ● Ext 2,3,4 ● ReiserFS ● XFS ● OCFS2 ● ZFS (port to FreeBSD) ● CEPH CVS ● SVN ● Mercurial ● GIT ○ GitLab ○ GitoLite Backup ● rsync ● BackupPC ● Bacula FTP ● ProFTPd ● VSFTPD File sharing ● NFS ● SAMBA Control Panel ● Direct Admin ● Webmin+Virtualmin ● CPanel ● ISP-config ● Plesk Automatization ● Puppet ● Saltstack Monitoring ● Zabbix ● Nagios ● Munin ● Monit Network Understanding of theoretical and practical foundations of the networks (Data link, Network, Transport, Application Layers). VPN ● OpenVPN ● PPTP Database (SQL) ● MySQL (+MariaDB, +Percona) ● PostgreSQL Database (NoSQL) ● ElasticSearch ● Riak ● MongoDB ● Cassandra ● Redis Virtualization & Containerization ● KVM ● XEN ● OpenVZ ● LXC ● Docker ● Vagrant Cluster ● DRBD ○ master-slave ○ master-master (+ocfs2) ● Heartbeat ● Pacemaker Development ● actively use: ○ shell (bash, sh) ○ Python ● Frameworks ○ Django ○ Flask ○ Twisted ○ Tornado Cloud Solutions: ● AWS (EC2, S3, CloudFront, Route53) ● DigitalOcean ● RackSpace

$33.33 /hr
36 hours
5.00
Bigyan Shrestha

Bigyan Shrestha

Software Engineer

Nepal - Last active: 18 days ago - Tests: 4

I have 2+ years experience in software development as a Software Engineer. * Languages: Java, PHP, Common LISP, C/C++, python * OS: Linux (Redhat, Debian), Windows * Databases: MySQL,Oracle, MsSQL, SQLite, Berkeley DB * Miscellaneous: # HTTP, SOAP, Web services # JBoss, Apache Tomcat, Slide (WebDAV) # Ant, Maven, Bamboo, SVN, CVS, GIT ** Specialties: Research, design, development, and testing of enterprise and desktop applications. Release engineering and tools development more info: http://np.linkedin.com/in/bigee

$44.44 /hr
13 hours
4.94