Network & System Administrators

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  1. Oleg Boytsev

    Oleg Boytsev

    Information Security Engineer/Malware Analyst/Reverse Engineer

    Belarus - Last active: 11 days ago - Tests: 1 - Portfolio: 1

    5 years of experience in IT Security field. Highly motivated to solve interesting tasks. Core Qualifications and abilities: High skills in *nix systems administration and information security; Computer network attack/defense; Deep experience in web application security testing (according to OWASP guideline); Strong background in malware analysis and reverse engineering; Responsive, organization skills and the ability to work with minimal supervision; Ability to learn and apply new technologies effectively. Technical skills: Standards/Practices: OWASP standards, ISO 17799 Operating Systems: Windows, Linux, FreeBSD; Networking: TCP/IP, LANs, VPNs, Firewalls; Software: Ollydbg, IDA Pro, GDB, Nmap, Metasploit framework, Burp Suite, Sqlmap, Wireshark, Tcpdump. Programming languages: x86 Assembly, Python Network & System Security: implementing different kinds of tools for network (ModSecurity) and system security Vulnerability Assessments: have a strong background in web application security testing, buffer overflows, format string vulnerabilities Malware Analysis: familiar with tools and techniques that allow to analyse and describe an evil sample according to the best practices. Unpacking, disassembling, binary Debugging/patching, dynamic (behavior) analysis. Reverse Engineering: familiar with Ollydbg, IDA Pro and GDB. System administration: LAMP, DNS, iptables, etc.., know how to solve a vast majority of issues.

    $35.00 /hr
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  2. Levan Gventsadze

    Levan Gventsadze

    Quick and Smart Linux specialist

    Georgia - Last active: 1 month ago - Tests: 6

    High quality professional with a masters degree in computer science. Worked on lots of governmental services, able to code in PHP, Perl, Bash, C, Assembly, dive into the system deeper, optimize its performance and speed. I've happened to write device drivers for Linux. Having huge experience with Linux world I can manage thousands of servers at the same time, implement a cloud, deploy a cluster, achieve high availability of services... I do not get windows related tasks, only Linux specific jobs please. I am pretty smart, very quick, honest and reliable contractor with good verbal and written English skills.

    $30.00 /hr
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  3. András Iványi

    András Iványi

    Application developer

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

    I am a Hungarian computer engineer guy, who is programming applications since the 5th class of the primary school, so I have now more, than 10 years of computer experience - more than 5 years professional computer experience. I started using computers in Kindergarten - I was able to create directories with Norton Commander, even before I was able to write with my own hands. Personally I am a very open-minded guy, who focused his life so far learning as much as possible on every field - including soft skills, professional skills, managing ideas, marketing, communicating with people, and a lot of other things. What I can offer to you, is a very good quality of software, well tested and well documented; strong communication skills; some ideas about your project, if you wish. If these things are not important for you - because you can not afford it for example because of short time - then I am afraid, I am not your guy. If I apply for a job, and get it, my very first thing is always to make a product, which is not just acceptable, but perfect for the needs of the client, and perfect for my own requirements too. I am not the cheapest option there, but for this price, you will get a very good quality of code and you will be really satisfied with my work.

    $35.00 /hr
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  4. Sergey Karatkevich

    Sergey Karatkevich

    DevOps

    Cyprus - Last active: 1 month ago - Tests: 8

    My key principles: * Simplicity - just describe you problem. I will offer you a solutions and your problem will be fixed. * Flexibility - flexible prices, work hours and contract terms. Each client is special. Onsite works welcome! * Scale and growth - I glad to help you grow up from a small project to the international business on several continents, step by step. * Trust and success - lot of clients trust me already and their business is successful. I sure I can help you too!

    $15.56 /hr
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  5. Martin S.

    Martin S.

    VoiP

    Spain - Last active: 1 month ago - Tests: 1 - Portfolio: 1

    Hi, I´m a telecom entrepreneur and active in VoiP/SIP on a global scale. Since 1996 i`m into IT and have a broad knowledge of many techniques. Because of my global understanding i do not need to know every detail to be able to provide the best solutions. Im a strong conceptual thinker, I have an extensive network of experts available (i use them myself). So if u have a problem or project, i can have that arranged for you. Me and my team do anything telecom or VoiP, we are experts in Hosted VoiP and SIP troubleshooting. But we can help u with anything u may need, including development of apps, websites and IT problem solution. We are managing three Kazoo clusters and developing whapps for them. I am very busy, but its nice to have other projects in the course of a year next to your own. They keep you sharp, takes your mind of your specific tasks and are fun, most of the time.

    $66.00 /hr
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  6. Federico de los Santos

    Federico de los Santos

    Microsoft System Center Consultant, MCSE Certified

    Uruguay - Last active: 9 days ago - Tests: 3 - Portfolio: 3

    Experienced consultant in Microsoft technologies including System Center, SharePoint, Exchange, Lync, and Active Directory. Primary projects focused in banking, financial, insurance and health industries. Worked on-site and remote to companies located in Argentina, Chile, Uruguay, Colombia, Dominican Republic, Puerto Rico and USA. Also I am an experienced developer which helps me to create integration tools between different technologies, and scripting to automate tasks. I have worked on companies evaluated as CMMI and I hold ITIL Certification. I am certified as MCSE since 1999 and hold certificate for more that 20 MOC exams. Also I have training experience to technical and end-user staff.

    $33.33 /hr
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  7. Sergey Alekseenko

    Sergey Alekseenko

    IT manager

    Russia - Last active: 2 days ago - Tests: 1

    Education 1984, graduated from Saint-Petersburg Shipbuilding Institute Engineer in shipbuilding/repairing. Major academic courses highlights: Shipbuilding Technology Communication Information Management System. Software development Professional Experience Oct 2012-----Present, as freelancer Web design, js, php, java (for instance: www.capa-city.ru) Nov 2007----Oct 2012, air-company “Heli Sky Inc”, SAIF-Zone, UAE Ops manager cum It manager Operations management of company/project. Computer/network maintenance Users support Account department support Aug 2003----Oct 2007, air-company “Jet line Intl.”, SAIF-Zone, UAE Ops manager cum It manager Operations management of projects. Account department support Computer/network maintenance Users support May 2001----Aug 2003, SWC “Lanit-Terkom”, Saint-Petersburg, Russia SW developer (VC++, VB, PHP, Java, Perl) Small project manager Small team leader Oct 1998----May 2001, “Representative Office Of Stockholm in SPb”, Saint- Petersburg, Russia System administrator Creating and support network Users support Additional Information Nationality: Russian Federation Work permit in countries: Russian Federation Languages: Russian: native English: intermediate Technical Summary C/ C++, SQL, VB, Java, JavaScript,php, HTML, DHTML

    $22.22 /hr
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  8. Ryan ODonnell

    Ryan ODonnell

    Python, Web-Stacks, and Go

    United States - Last active: 2 days ago - Tests: 3 - Portfolio: 2

    Experienced Python and Go full-stack web-developer. Bootstrapped many websites in Python and associated frameworks. Tasks included: full-stack administration on both Windows and Linux technologies, backend software development, and front-end responsive and mobile design. Can easily develop a working prototype of a website very quickly, and deliver a functioning product in an acceptable time frame. Cisco Certified technician willing to consult on various technology needs.

    $100.00 /hr
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  9. Edgaras Zulonas

    Edgaras Zulonas

    System analyst

    Lithuania - Last active: 1 month ago - Tests: 4

    *nix: Debian, Slackware, openSUSE, CentOS, OS X, NetBSD, OpenBSD, QNX Neutrino RTOS 6.2.1, OpenWRT, dd-wrt; Windows: all; *nix Software: Linux Networking Tools, VPN, VNC, Apache, Samba, Squid, Snort IDS/IPS; M$ Software: IIS, LDAP, AD, RDP, TeamViewer; VM: Oracle VM Virtualbox, qemu, Hyper-V; DB: Mysql; CMS: Drupal; Spoken Languages: Lithuanian, Russian, English.

    $50.00 /hr
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  10. Carlos S.

    Carlos S.

    Linux SysAdmin

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

    For the past ten years, I have worked as a Sysadmin for government institutions and private companies. I have also worked as a Linux instructor and an IT consultant with topics such as: Firewalls, Web Servers, Virtualization, CMS, Databases and HA. As a Sysadmin I have great experience in the following areas: SQL, CPANEL, hosting providers, DNS, DHCP, LDAP, software security testing/qa, packing for Debian and much more. For me, it would be a very grateful opportunity to work with opensource technology in your business.

    $25.00 /hr
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