Top Upwork Freelancers

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  1. Pasqualino Ferrentino

    Pasqualino Ferrentino

    Software Architect

    Italy - Last active: 17 hours ago - Tests: 17 - Portfolio: 1

    I am a computer scientist whose main skills are in the field of data analysis, pattern recognition, statistical software, machine learning and large scale system design and integration. I have developed systems using Neural Networks, Markov chains, Support Vector Machines in various applications: OCR, image processing, data analysis, text indexing and retrieval. I am also proficient in 3D image visualization using common off the shelf libraries and methodologies, either low or high level, like OpenGL, DirectX, VTK, Java3D. I understand and use common ray tracing programs. I understand image processing topics like segmentation, thresholding, classification. I have worked in the past in a 3d Face recognition European project. I know the OpenCV library quite well. In the field of "general programming" I have a good understanding of Databases, multi threaded applications, sockets, pipes, encryption (symmetric and asymmetric), compiler design, operating systems, low level data structure in memory and on disk, data integrity. I consider myself an expert in data structures and algorithms: trees, queues, lists, b-trees, hash tables; I use standard libraries like STL, Boost, Java generics. I have a good knowledge of SQL and data normalization however I have also used custom No-SQL databases like Datadraw, MapDB, Tokyo Cabinet, Zope. I know all the basic algorithms and templates used in every day coding; regarding data integrity and security. Compression (lossy and lossless), symmetric and asymmetric encryption, public certificates, I have worked with OpenSSL programming, encrypted web services, packet sniffers. I am proficient in all the common every day languages with an emphasis on C++ and Perl. But I can use: Java, Python, Visual Basic, C#, PLSQL, Delphi. I know all the Object Oriented Programming concepts and design patterns and I use them if the need arises, but I am also able to write object-free programs in C or functional languages (like Haskell or Scheme). I know modern version control systems like git and mercurial, even if I can use also older ones like Subversion or CVS. I know Windows programming and API quite well. I have used WPF and WCF to create desktop applications in Windows and web services. I have used Linux and Gui toolkits like Qt which are platform independent. I know XML, XSL, I have used several parsers like the MsXML or Xpath. I know how to validate a XML with a schema. I have worked with a team that handled thousands of XML documents relating to air crashes in a SQL server database. I am able to talk and write in English with fluency. If anything is not listed here either I have forgotten to list it or I can probably learn it quite fast, so don't hesitate in asking!

    $24.41 /hr
    7,094 hours
    4.97
  2. Biju J.

    Biju J.

    Web applications,Access & Excel VBA/Macro developer

    India - Last active: 1 day ago - Tests: 4 - Portfolio: 7

    Seeking challenging assignments for software development (windows and web), VBA Programming, auto processing / manipulation of excel and word documents. Technically sophisticated professional, offering 16+ years of insightful experience in Computer Programming, Software Training and Troubleshooting in India and abroad. During my 16 years of work experience, I have developed many software applications using the technologies Java / JSP / HTML / JavaScript / ajax, C#, Visual Basic, VB.Net, Visual Foxpro, Excel VBA, Word VBA, MS SQL Server, Sybase and MS Access. Example of work done : Work Order Tracking System, Call Desk Ticket Scheduling System,Payroll system, Water Connection & Billing System, Time Sheet & Cost Tracking System, Estimation System, Mail Server System, IT Help Desk & Tour Management System etc. I also have very good experience in Microsoft Office Package Excel,Word and PowerPoint. Expert in making forms in MS Excel and Word with validation, functions, macros and VBA application. Example of work done in excel : Developed function using excel macro to convert number to word (spell number). Developed excel form with look up functions, validation to verify the invoice of contractor. Developed a MS Word VBA application for extracting content from another word file and insert data in a new document based on the selection criteria in a cascading list box. Award: I received award from Saudi Arabian Oil Company for the automation of Work Order Processing with paperless workflow.

    $22.22 /hr
    1,209 hours
    4.98
  3. Yuliyan Tsvetkov

    Yuliyan Tsvetkov

    Advanced linux administrator and system automator

    Bulgaria - Last active: 15 days ago - Tests: 6 - Portfolio: 1

    In the world of 24/7 available services, giving to the customer best stable and optimized Linux environment is the primary role of every System Administrator, my role too. I've 5 years of experience in automation, installation and maintenance of Linux servers based on RHEL, CentOS, Fedora, Debian and Slackware distributions. Also I'm managing a lot of live servers for the biggest Telcos in the Middle east and Africa using new technologies, and also proven old ones.

    $22.22 /hr
    214 hours
    4.68
  4. Geza Akocsi

    Geza Akocsi

    Windows system and network administration, web development

    Hungary - Last active: 6 days ago - Tests: 4 - Portfolio: 1

    In the last 3 years I'm working as consultant, developer and system administrator in introduction of document management projects based on ELO system. (<a href="<a href="http://www.odesk.com/leaving_odesk.php?ref=http%3A%2F%2Fwww.elo.com"";;;; target="_blank">http://www.odesk.com/leaving_odesk.php?ref=http%3A%2F%2Fwww.elo.com"</a>;;;;; title="You are about to go to a URL outside odesk.com"><a href="http://www.odesk.com/leaving_odesk.php?ref=http%3A%2F%2Fwww.elo.com";;;; title="You are about to go to a URL outside odesk.com">http://www.elo.com</a></a>)I have 15 years of experience in system management in small business area. (Windows based servers and workstations, network planning and management.)In last five years I have designed and developed some websites from scratch, including areas of e-commerce and web-based business management.I have a lot of practice in remote management and it is my new tendency in my support field.

    $11.11 /hr
    17 hours
    4.81
  5. Julio Carvajal

    Julio Carvajal

    CCIE 42930,2xCCNP,Juniper Specialist

    Costa Rica - Last active: 1 day ago - Tests: 2 - Portfolio: 4

    Senior Network and Security engineer with more than 10 certifications from different vendors including a CCIE. As a Cisco TAC engineer I fixed over 2000 different issues on multiple platforms. Let me show you I am your network engineer. Certifications List: CompTIA Security+ CCNA JNCIA CCNA Sec CCNP Security CCNP Routing&Switching JNCIS-SEC CCIE Routing&Switching 42930 Languages: Spanish, English

    $77.78 /hr
    131 hours
    4.91
  6. Prabhu J.

    Prabhu J.

    Expert SAP HANA Developer

    India - Last active: 14 days ago - Tests: 1

    Software Developer with 2.5 years experience in SAP HANA, SAPUI5, Javascript and JAVA. I am a developer having working experience in SAP HANA and SAPUI5 and also a trainer for SAP HANA Development Basics. I have advanced skills in HANA Modeling, SQLSCRIPT, XSJS, SAPUI5. I have completed my Bachelor of Engineering in Computer Science degree in 2012. I have also worked on developing APIs using Express.js, nodejs and MongoDB.

    $20.00 /hr
    44 hours
    5.00
  7. Jagjeet Singh

    Jagjeet Singh

    Labtech, Kaseya, ConnectWise Consultant

    India - Last active: 5 days ago - Tests: 1

    Technically knowledgeable and service oriented IT professional experienced in providing solutions to customer and end-users with proven technical expertise is seeking for a rewarding, challenging and personal growth where I can best use my knowledge and experiences in implementing, managing and supporting the IT infrastructure and end-users. Specializing in designing, implementing and maintaining Enterprise IT platforms, TRT takes the stress, risk and complexity out of managing core IT systems. Maintain complete control over the environment we take accountability for keeping it running efficiently and securely.

    $22.22 /hr
    1,843 hours
    5.00
  8. Vladimir Mott

    Vladimir Mott

    Microsoft Exchange, Lync, & PowerShell Expert

    United States - Last active: 1 day ago - Tests: 3

    Ex-Microsoft Senior Consultant with 15 years industry experience designing, deploying, securing and managing Microsoft Exchange, Lync, and Active Directory. Deep experience with multi-site deployments, Exchange Database Availability Groups, Lync Enterprise Voice,and hybrid Microsoft Office 365 deployments with SSO. Complex migrations to/from Exchange, Lync, and Office 365 are my specialty. Very experienced with complex hybrid / coexistence scenarios that require directory synchronization, federation, and custom PowerShell scripting. Excellent communication and problem-solving skills. I am based in California, USA. Technical Skills: - Exchange 2003/2007/2010/2013 - Lync 2010/2013 with Enterprise Voice - PowerShell Scripting - Office 365 - Forefront Identity Manager (FIM) - Active Directory - Windows Server 2003/2008/2012 R2 - Hyper-V - ADSI, LDAP, DNS, SMTP, TCP/IP

    $75.00 /hr
    520 hours
    5.00
  9. Roland S.

    Roland S.

    PHP programmer experienced in Zend Framework, CMS

    Serbia - Last active: 3 days ago - Portfolio: 29

    I'm a web developer in Serbia with 6 years of experience in the industry. I was worked in older frameworks, but nowadays I work with Zend Framework on a large scale web applications. When i have free time i develop my Cms with Zend Framework which I use as a core in my projects.

    $20.00 /hr
    1,702 hours
    5.00
  10. Timur Birsh

    Timur Birsh

    Unix Systems Expert and Oracle DBA

    Kazakhstan - Last active: 19 days ago - Tests: 7

    Hello, Over the last 15 years, I am working with the following Unix systems: BSD based systems, Solaris and Linux distributions including Debian, RedHat Enterprise Linux, CentOS, Oracle Linux and Ubuntu. Over the past years I have developed a wide range of solutions: VPN, proxy, mail, web, file, Samba, DNS, DHCP, SSO, database, monitoring, backup, virtualization and high availability servers. I am Oracle DBA with the 5 years of experience. I work for financial institution. On my control a 21 databases. Mission critical and big databases runs on the IBM hardware and AIX operating system. Other databases runs under control of Solaris (SPARC) and Linux operating systems. For data protection we use Data Guard. One of the best products of the Oracle is Enterprise Manager Cloud Control. We use it for the databases and hosts monitoring. Its management repository contains a lot of information. It is very useful in building of custom applications (reports, etc). I have work experience with the following Oracle RDBMS versions: 8i/9i/10g/11g. I am big fan of a tasks automation. For small jobs I use shell scripts. For jobs that have complex logic I use Python or Perl. For complex text processing I use awk, sed and shell scripts as a glue. I have 5+ experience of C language programming for Unix. Hardware administration of the following vendors: Oracle (Sun), HP, Dell. I am contributor of the following free software projects: Debian (http://qa.debian.org/developer.php?login=taem@linukz.org), Transmission Bittorrent Client, inadyn Dyndns client. I maintain the following opensource programs: * sXid - http://linukz.org/sxid.shtml * cd-discid - http://linukz.org/cd-discid.shtml I use Git for source code management. I would be happy to help you. Please do not hesitate to contact me.

    $33.33 /hr
    18 hours
    4.97