Top Upwork Freelancers

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  1. alexander Merkulov

    alexander Merkulov Agency Contractor

    Asterisk/voip/a2billing/freepbx/kamailio expert

    Ukraine - Tests: 6 - Portfolio: 5

    My time is my value. So when you choosing me you can expect that job will be done in short terms and perfect. I not like to do something that not need be done, i prefer use developed components and solutions. That not mean i can't do development. I working with different programing tasks for last 26 years. yes, from 6 y.o. I live in it. So i prefer do something new&interesting; I can handle all tasks from linux administration/virtualization upto end-user web for voip. Only task i never do - graphical design part. That is not my field, better hire someone else for design. I have university degree, working with asterisk from start of this project. Have developing experience with freepbx/trixbox&a2billing. I am one of contributor of a2billing.org trunk. Also i can work as mysql/postgres DBA, database architect, has experience with following languages: Perl Python PHP C/C++ Javascript SQL Prolog/Lisp,Forth. In voip i can work with callweaver, asterisk, opensips, kamailio. Developed modules for freepbx, elastix, trixbox, a2billing.

    Associated with: UA Prime Agency

    $67.77 /hr
    545 hours
    4.97
  2. Aliaksandr Trutchanka

    Aliaksandr Trutchanka Agency Contractor

    iOS/Android (cocos2dx) mobile developer

    Belarus - Tests: 1 - Portfolio: 13

    I'm mobile developer with 9+ years of experience (5+ in mobile). My specialisation is 2D iOS and Android mobile applications (usually games) based on cocos2d-x engine for iOS and Android. I use my own custom tool libraries to speedup app development. They extends cocos2dx functionality and contains the following: - localisation tools (UTF8 and UTF16); - iAPPs cross-platform support; - local notifications cross-platform support; - ads sdk wrappers and manager; - Flurry support; - Network game services support (GC); - resource control extensions; - UI extensions for cocos2dx; - time management,file managment and other utility tools. I will happy to help you to create your 2D mobile app with the best price-quality ratio!

    Associated with: League of Independent Developers

    $25.00 /hr
    2,450 hours
    4.36
  3. Sergey S.

    Sergey S. Agency Contractor

    .NET, Autodesk API (AutoCAD, Revit, Navisworks, Inventor, Maya)

    Russia - Tests: 7 - Portfolio: 12

    Hi, My name is Sergey. Just check my portfolio, and you will find a lot of programs that I have developed. I believe that my strong sides are my Creativity and Punctuality. My first goal will always be to meet your needs and deadline. When working on a new project, I like to speak with the client, so that I can have a clear understanding of his/her needs and vision of the project. I am an individual Autodesk API / .NET developer and have over 9 years of experience as an AutoCAD Specialist. I develop custom add-ins for Revit, AutoCAD, Navisworks using the Autodesk API's. Please take a look at my work history for comments from other clients. Thank you in advance for your time and consideration. I look forward to working with you soon. Skills and Experiences: - CAD systems [Expert in CAD programming and custom CAD application development for AutoCAD, creating custom entity/objects, cutomize AutoCAD, custom commands, using ObjectARX, VBA-scripts. Navisworks API (.NET, COM) Developer. Revit API (.NET, COM) Developer. Microstation v8 development (VBA, .NET, MDL). SmartPlantP&ID Developer] - Windows desktop Development [Desktop Applications(WinForms, WPF). Expert in Excel-datasheets, Macros-VBA.] -Web development [ASP.NET. MVC. HTML5. CSS3.] -Microsoft Office [Access developer. Excel macros developer. VBA developer.]

    Associated with: Smart SQ-O

    $33.33 /hr
    951 hours
    4.85
  4. Richard Morrison

    Richard Morrison Agency Contractor

    MS SQL DBA Optimization, Clustering, Mirroring, Replication, TSQL

    United Kingdom - Tests: 4

    Certified Database Administrator with over 10 years experience working with SQL Server 2012, 2008, 2005, 2000, 7.0 and 6.5. My proven skillset, has enabled me to work alongside and provide consultancy to Architecture and Development teams. My objective is to use my experience to bring creative and robust solutions to businesses that requires a SQL Server Database Administrator/Developer. Skillset - Windows and SQL Server Clustering, TSQL, DTS, SSIS (ETL), SSRS, Performance Tuning/Optimization & Transactional ReplicationI also have 'real world' experience implementing backup, maintenance and disaster recovery strategies across multiple data centres.

    Associated with: DBTECH SOLUTIONS

    $50.00 /hr
    2,448 hours
    4.99
  5. Yavor I.

    Yavor I. Agency Contractor

    Android/Wear/Tizen/Backend developer

    Bulgaria - Tests: 2 - Portfolio: 17

    Over the last 5 years I have developed a wide range of applications for Android based smartphones and tablets. Most of my clients are companies from the small business but also I've worked for Samsung, Shutterstock and British Telecom. I'm seeking opportunities to build applications from the ground up for you or your business. I have strong experience in these areas : Java, Android, Google App Engine, Backend and API development, Google Cloud Datastore, Tizen SDK, Database (Oracle, MySql and Sqlite), Ruby and HTML5/CSS3. I'm mainly interested in mobile apps development but I'm able to handle cross-client development including backend/API and web application. Example 1) Android app + Google App Engine(Backend) + Google Cloud Endpoints(API) Example 2) Example 1 + Google Cloud Messaging Example 3) Example 2 + Google Cloud Datastore Example 4) Example 1 or Example 2 or Example 3 + Web app (html/css/javascript) Example 5) Any of the examples above + Wear/Tizen app Example 6) Any of the examples above + UI An UI can be provided by one of the few very skilled designer I'm working with. It will be Android compatible by using the Material Design principles. * Please, only serious clients with vision for great, long-term projects! Not interested in part-time jobs. Strong communication is required!

    Associated with: Dision

    $32.22 /hr
    2,195 hours
    4.83
  6. Vinh Tran

    Vinh Tran Agency Contractor

    Senior .NET Developer

    Vietnam - Tests: 2 - Portfolio: 11

    I'm a senior software engineer who works in software development for the last 14 years developing a wide range of desktop and web applications using various technologies and I'm interested in developing end-to-end applications. I'm now specialized in C#, ASP.NET MVC, WCF, Web API, Entity Framework, Telerik, DevExpress, ExtJS, jQuery, SQL Server and so on. Programming languages and frameworks: - C#, VB/VB.NET, ASP.NET MVC, WinForm - WCF, Web API - ExtJs, jQuery, Kendo UI, Syncfusion - DevExpress, Telerik - Entity Framework - StructureMap, Unity - MS Unit test, Moq - MailBees.NET - CSLA.NET - T-SQL programming Typical Projects: 1. Payroll System: A desktop application for payroll processing of a resource-pool provider. The system was designed to keep track of employee information and contracts. Processing monthly/adhoc timesheets and invoicing the manpower cost Technologies used: C# (.NET 4.5), Entity Framework 6.0, DevExpress 2. Online CRM system: A web-based application designed to function as an online CRM system for organizations operating funds in managing fund allotments, transfers, reinvestments, and distribution. Not only for fund management but the CRM also provides core functionality to allow plugin other modules such Contract management, Project management, etc. Technologies used: ASP.NET 4.5 (C#), Entity Framework 6.0, WCF Service providing REST API, Extjs 4.0, RDLC report technology, SQL Server 2012 3. Waterfall calculation web-based application: A web-based application designed to perform complex waterfall calculations for alternative investment funds. Specifically the application automates the Carried Interest Calculation (Calc) which is used to determine the fund manager’s compensation in regards to the profits of the fund. Technologies used: ASP.NET 4.5 (C#), jQuery, jgGrid, MS Reporting Service, MS Enterprise Library, SQL Server 2012 4. Contact management system: A web-based application that used as an internal application of contact management system. The system was developed using Asp.Net (C#), Linq2SQL, Ext.Net, CSLA.Net, and MS Server 2008 with a lot of T-SQL coding on DB server side. Technologies used: VB.Net 3.5, CSLA.Net, Ext.Net 5. Hospitality ERP: A desktop integrated information system for managing all activities of a 5-star hotel, including: Human Resource Management, Front Office, House Keeping, Point Of Sale, Call Billing Service, Financial Report, Back Office. Technologies used: .Net 2.0 with .Net Remoting, .Net Web service, NHibernate, SQL Server 2005 6. Healthcare Information System: Develop an integrated hospital information system managing all daily activities of the hospital, including: Pharmacy inventory management, Outpatients examination management, Inpatients treatment management, Patients record management, Patients expenses management, Para-clinic management. Technologies used: VB.Net 3.5, MS SQL Server 2005

    Associated with: Enterprise Lab

    $20.00 /hr
    3,288 hours
    5.00
  7. Roman T.

    Roman T. Agency Contractor

    UNIX and security expert, network and system administrator

    United States - Tests: 9 - Portfolio: 3

    I'm a problem solver with technical and managerial experience, based out of Los Angeles. I love solving complicated problems by building elegant solutions and seeing the impact it has on a business's growth. I've always been interested in the technological field, specifically in information security and automation, which has made a huge impact on my work experience. However, I recently found myself involved in start-ups and helping with management, risk assessment and developing business strategies. I offer the following key services: o Security Audit o Network and Systems Administrator Services o Information Security Services o IP-PBX and VoIP softswitchs: installation and maintenance o Software development: Web, desktop and server applications o Complex solutions for business-process automation Experience Platforms: Cisco (routers, switches and ASA), Huawei (L2&L3 routers and switches), MikroTik, Ubiquiti, OpenStack. OSs: UNIX (FreeBSD, OpenBSD, *BSD, Solaris), Linux (Debian, Ubuntu, Kali, Gentoo, Red Hat, SuSe, uLinux, ASP, Mandrake, Fedora Core), MikroTik's RouterOS, VRP (Huawei), Windows 95/98. Languages: C/C++, UNIX Shell Scripting (Bash, Shell, sed, awk), Delphi (Pascal), Perl, PHP, Python, SQL, T-SQL, Assembler (Intel and AT&T SysV/386 syntax), GTK+ applications, Erlang, HTML, CSS, JavaScript, JQuery, JSON, REST API, XML, XSLT, DTD. Databases Engines: PostgreSQL, MySQL, Oracle, SQLite, Mnesia, MS Access, Sybase, DB2. Networking: TCP/IP, ISO/OSI, IPv6, Ethernet, VLAN (dot1q), ARP, VRRP, CARP, MPLS L2, MPLS L3, STP, GVRP, PPPoE, VPN, PPTP, L2TP, IPSec, OpenVPN, SNMP, SSH, XMPP, SIP, h323, BGP, OSPF, RIP, IRC, AJAX, Netflow. Virtualization: OpenStack, XEN/Server, Qemu, VMWare, FreeBSD Jail, Chroot. CMS: WordPress, Bitrix, osCommerce, Joomla, RoundCube. Panels: CPanel, Plesk, ISPManager, Webmin.

    Associated with: IntLös

    $35.00 /hr
    313 hours
    4.87
  8. Hamza Shahid

    Hamza Shahid Agency Contractor

    Video Compression/Decompression, Multimedia, Embedded, Linux & Windows

    Pakistan - Tests: 2

    To work on cutting edge and challenging technologies and provide services in my field of expertise. I have over 7 years of experience in embedded development, video compression/decompression technologies, application development for windows and linux. Tools and technologies I am expert in include C/C++ programming language, C#, Microsoft Directshow. I have also worked on embedded systems which include Xtensa based boards and Texas Instruments DM6467 based boards. I have lots of experience in algorithm development and optimization.

    Associated with: MayarTech

    $16.67 /hr
    1,037 hours
    4.77
  9. Robert H.

    Robert H. Agency Contractor

    Team Lead/ Technical Expert Support(Phone/Chat/Email)

    Philippines - Tests: 6

    I have been working in a business process outsourcing industry for 13 years. This has been an invaluable experience in terms of learning different level of techniques to enhance my performance from an entry level customer care representative processing emails and chat to a 2nd level technical support providing extensive solutions and strengthening client relationship. As a leader, I am currently focused on developing and leading a team to exceed client expectations. I aim to do the same in Odesk given the opportunity to commit myself in the personal and professional development of a team as well as apply the day-to-day project experiences to individual talents.

    Associated with: MAGNIFICO

    $12.00 /hr
    6,384 hours
    4.70
  10. Oussama K.

    Oussama K. Agency Contractor

    Desktop and Web Application Developper

    Morocco - Tests: 2 - Portfolio: 12

    I have extensive experience in Website and Software development for both Windows and Linux platform.. I am a dedicated and hard working professional who deliver the work within the Timeline. You can get my service in the following fields: -Web Developement : * PHP (Core and Oriented Object) * CakePHP, MySQL,PostgreSQL * HTML5, CSS * Javascript, Ajax, jQuery, jQuery UI. -Desktop Applications Developement : *JAVA *C# *VBNET

    Groups: Crossrider, LoginRadius

    Associated with: kmldesk

    $22.22 /hr
    1,942 hours
    4.99