Top Upwork Freelancers

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  1. Pasqualino Ferrentino

    Pasqualino Ferrentino

    Software Architect

    Italy - Last active: 9 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
    7,110 hours
    4.97
  2. David Miller

    David Miller

    Screen Scraping, Data Harvesting, Mozenda EXPERT

    United States - Last active: 4 days ago - Tests: 2 - Portfolio: 4

    I am a Mozenda and data harvesting expert. As an ex-Mozenda employee I am familiar with the software inside and out. I have been working with Mozenda longer than anyone else out there. My work is fast and accurate. Contact me for any job using Mozenda, or any job about data harvesting, mining, scraping, etc. I am able to manage large projects and assemble and manage a team of Mozenda professionals. I have built and managed literally tens of thousands of agents.

    $80.00 /hr
    296 hours
    4.86
  3. Oleg Vakheta

    Oleg Vakheta

    Go/Golang/Perl/MySQL/JavaScript Developer, Linux Administrator

    Ukraine - Last active: 25 days ago - Tests: 9

    I love Go, Perl and Linux )) Have more then 7 years experience in Perl developing, more then 2 years in Go and I'm also passionate Linux administrator. Now I'm concentrated in developing for Web, using Go, Perl+fastcgi+nginx. I made many parsers, system scripts, web systems. My main directions in work: - Go (Golang), Revel, Martini, pure "net/http" for handling routes; - Perl developing ( web systems, scrapers/parsers, system scripts ); - Web developing, using: Perl, Javascript, Jquery, Ajax, HTML, CSS; - Linux administration; - MySQL server and queries optimization for high loading systems; - PostgreSQL - queries optimization, writing functions, triggers; - security audit; - SEO. I am open for new knowledge and critique.

    $27.78 /hr
    1,605 hours
    4.62
  4. Tanmoy S.

    Tanmoy S.

    Web Developer | Android Developer

    Bangladesh - Last active: 1 day ago - Tests: 13 - Portfolio: 2

    Greetings. I'm basically a programmer working with Web & Android application development over 8 years. I've strong knowledge on OOPHP/MySQL/MongoDB/JavaScript (jQuery)/Node.js and CMS on those like WordPress and Joomla. For MVC, I work with PhalconPHP and Laravel. I developed at least 600 WordPress based website which included different themes, plugins, custom themes & plugins development, custom field/meta/taxonomy/cron etc. Using Laravel & Phalcon, I developed more than 100 high-end applications. I'm very skilled in REST API based projects. I develop API as well, JSON/XML or SOAP whatever needed. I'm working as an Android and iOS developer since 2011. I'm highly skilled in SQLite Database, HTTP/Socket connection, File, Media, In-App Purchase, Google Play Licensing, Camera, Location, Sensors etc. based projects. I use Java for Android Development, Swift for iOS. I'm an expert in managing servers. CentOS (Mainly any RPM based distros) and Debian is my first preference. Hence I prefer Nginx for performance. Mongodb for large application server. in AWS services like Beanstalk, Private Cloud, Amazon SES, EB Storage, Route 53, RDS, Amazon DynamoDB I've excellent knowledge. I deployed over 50 application in AWS EB. For my expertise, dedication and hard work, I always got great feedback from client. What you're still waiting for? Just hire me to get your project done.

    Groups: Application Developers Alliance, AWeber...

    $33.33 /hr
    1,670 hours
    5.00
  5. Alex German

    Alex German

    Web Programmer. PHP/MySql, Ajax, HTML5/CSS3, Wordpress CMS

    Ukraine - Last active: 2 days ago - Tests: 8 - Portfolio: 7

    I am currently looking for the full time/part time PHP/MySQL programming job for a company or individual and would like to get committed for a long term collaboration with a reliable service buyer. Experienced in the following areas: - PHP - MySQL - Ajax - Java Script - XHTML/CSS Frameworks: - Symfony - YII - Kohana - CodeIgniter CMS: Wordpress, Prestashop Also: Linux, Apache, MVC, SVN, GIT, Mantis/Jira/Redmine

    $38.89 /hr
    8,799 hours
    4.99
  6. Megh S.

    Megh S.

    Microsoft Dynamics CRM Techno Functional Consultant

    India - Last active: 1 day ago - Tests: 2 - Portfolio: 2

    A Certified Microsoft Dynamics CRM Consultant with extensive 8+ years of experience in Microsoft Dynamics CRM implementations in different business verticals like Healthcare, Agrochemical, travel, Real estate, Retails, Banking, Insurance. CRM Versions: 1. CRM 2013 online/on-premise 2. CRM 2011 online/on-premise 3. CRM 4.0 on-premise Certification: • Microsoft Dynamics CRM 2011 Applications • Microsoft Dynamics CRM 2011 Customization and Configuration • Microsoft Dynamics CRM 4.0 Applications • Microsoft Dynamics CRM 4.0 Installation & Deployment • ITIL V3 Foundation Certification • Expertise in implementing CRM solutions to help companies to become more productive using Microsoft CRM as a development platform. • Strong experience in Plug-in writing, custom workflow development, Javascript coding, HTML programming,sharepoint integration, Webservice integration, SSRS reporting. • Experience migration from CRM 4.0 to 2011 and to CRM 2013, migration of legacy system to CRM system. • Strong experience in system & business analysis, designing, implementation, system migration & development of business applications using N-tier architecture with Microsoft Dynamics CRM 2011/4.0 • Advanced skills in integrating and implementing Microsoft Dynamics CRM 2013/CRM 2011/4.0 with Asp.net, C#, XML, HTML, JavaScript, SQL and Oracle Connectors using ADO.NET applications • Providing training on MS CRM (Basic/Advanced) to End users, new comers. • Complete problem solving and troubleshooting abilities I’m well versed with: • Business and Requirement Analysis • Plug-g, Workflow, Outlook & Web service Integration development • System & UI Design • Customer Interfacing • Project Management Thanks Mac

    $30.00 /hr
    1,480 hours
    4.26
  7. Adrian R.

    Adrian R.

    Senior PHP5 / Zend Framework / Symfony / Doctrine developer

    Romania - Last active: 1 day ago - Tests: 5

    ExpertRating Certified PHP5 Professional with GPA4 and a percentage which hold the top position for a couple of years. Results oriented application developer focused on delivering high quality code and solutions. Over ten years of intensive work in the web development industry. Experienced with all aspects of building large-scale web based applications. Genuine interest in technology, eye for detail and analytical mind. Up to date with best practices and latest technologies at every level of development. Passion for PHP.

    $55.00 /hr
    7,748 hours
    4.96
  8. Christopher James

    Christopher James

    PHP Web App Developer: Any Framework, APIs and UI. 15+ years (USA)

    United States - Last active: 3 days ago - Tests: 6 - Portfolio: 12

    Since 1998 I have developed dozens of web applications focusing on a wide-range of industries including custom search engines, affiliate marketing, real estate solutions and worker safety. As an autodidact, I pride myself on learning new technologies and continually improving my skill-set. As a freelancer, I believe in professionalism, clean code and representing my craft to the highest degree possible. On the server-side, Laravel is my current PHP framework of choice, although I am comfortable working with Zend, CodeIgniter, Cake and Yii. For the database layer, I have 14 years of experience with MySQL. On the client-side, I prefer jQuery, Backbone and Twitter Bootstrap. Although I am not a graphic designer, I know my way around the Adobe software suite. I write standard compliant HTML5 and CSS3. I have an eye for useable, clean and obvious functionality. I have experience with many APIs, including Amazon, Box.net, Infusionsoft, Facebook, Twitter, PayPal, eWay, Authorize.net and Google. I can write APIs from scratch and give your application a RESTful interface. I am seeking opportunities to build custom web applications from the ground up or taking an existing code base and improving upon it.

    $110.00 /hr
    6,865 hours
    5.00
  9. Peter Y.

    Peter Y.

    PHP/MySQL, Javascript, Ajax, HTML/CSS EXPERT

    Ukraine - Last active: 14 days ago - Tests: 3 - Portfolio: 6

    I'm looking for excited projects that will allow me to use my knowledge of php, js, ajax, html/css, etc. -small friendly tools with AJAX -good balanced class architecture, that doesn't require hundreds of hours to be understood. -well done database modeling, with intuitive approach. -or just nice plug-in for getting tweets. I’m always happy to work on hard, challanging and extraordinary tasks, that require fast and optimal solutions. I'm very creative at resolution of difficult tasks. I have some free time and unused brain reserves. So, I’m here now, with much experience and career progress from junior developer to middle, and team leader. And I'm looking forward to work with you! Be sure I'm full of ideas and suggestions, you'll never regret hiring me.

    $25.00 /hr
    60 hours
    5.00
  10. Ryan Bobrowski

    Ryan Bobrowski

    Web Developer - php, mysql, laravel, wordpress, git, jquery, sass

    United States - Last active: 7 days ago - Tests: 12 - Portfolio: 3

    I'm a well-rounded developer who has worked on a variety of front and back-end projects. My passion is creating clean, extensible code using best practices and design patterns. I absolutely love developing in Laravel, and I've recently picked up Angular/Reactjs development. In addition, I have years of general PHP, MySQL and JavaScript/jQuery experience, and I consider my front-end responsive design and development skills in HTML5 and CSS3/Sass top notch. My latest project is a fully-featured iOS app written in Swift. Functionality includes sharing, communication, social networking, and API integration.

    $40.00 /hr
    1,429 hours
    4.80