Top Upwork Freelancers

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  1. Maciej Klepaczewski

    Maciej Klepaczewski

    Web Performance Optimization Engineer

    Poland - Tests: 2 - Portfolio: 2

    I specialize in Website Performance Optimization (WPO). In particular I do: * MySQL optimization, * PHP optimization, * HTML/JavaScript/CSS related optimizations. I can guarantee page loading times in range of 1-3 seconds or less. I also have experience in web scrapping and handling large amounts of data (where by big data I mean at least dozens of gigabytes). I have masters degree in Computer Science from Wroclaw Technical University. I'm experienced programmer with 15 years of experience (I coded my first software in high school).

    $80.00 /hr
    945 hours
    5.00
  2. Dmitry O.

    Dmitry O.

    Java/Scala/C++ Senior Developer

    Uruguay - Tests: 6 - Portfolio: 3

    10+ years experience in Java EE & Core Java. 4 years experience in C++. Practical experience in: - architecture, design, development, testing and deployment of server-side and desktop applications, databases. - transaction processing, distributed SOA systems integration. - work experience in small to large teams, for government, commercial and financial clients. Java technologies: Core Java, Java EE, EJB/JPA/Hibernate, WebServices integration. WildFly(JBoss)/GlassFish/Tomcat servers, Spring and Struts MVC frameworks. Scala stack: Akka, Spark SQL (with DataStax). Java UI: JSF, JSP, Swing, SWT. C++: Qt, STL & boost. Databases: Cassandra(DataStax), ElasticSearch, MySQL, PostgreSQL, MS SQL Server. Development tools: Maven, SBT, JUnit, Git/Mercurial. OS: Linux server administration & Bash scripts. DataCenters: Google Storage.

    $30.00 /hr
    566 hours
    5.00
  3. James Woodmancy

    James Woodmancy

    Umbraco/.NET Developer

    United Kingdom - Tests: 1 - Portfolio: 2

    Umbraco Certified Level 1 and 2 10 years experience in web development London digital agency experience working on many high profile sites including Bupa,Channel 4,The Prostate Cancer Charity and Mencap. All built using the Umbraco CMS. My Core skills include Umbraco, ASP.NET, C#, SQL, AJAX, JQUERY/JavaScript/JSON, XML/XSLT/XPATH, MVC, Entity Framework I am originally from the UK living in Taiwan so I am a native English speaker.

    $48.00 /hr
    1,669 hours
    5.00
  4. Alex Hong

    Alex Hong

    iBeacon, Bluetooth, BLE, GPS, Chat Expert for iPhone & Android

    Hong Kong - Tests: 5 - Portfolio: 6

    I have 4 years experience of mobile app development both of iOS and Android. Specially I have rich experiences of iBeacon/Beacon and Bluetooth. I have developed many apps related to iBeacon/Beacon or BLE, in the meantime, I could get ability for developing any apps related with it. I am fascinated by iBeacon/Beacon, and have got confident that I can do anything about it. With this background, I can say that I am an expert of iBeacon/Beacon and Bluetooth/BLE. I want to work with the companies that produce bluetooth devices including iBeacons/Beacon, BLE or other wearable device, and clients who want to build systems and apps using these devices. I'll make mobile applications such as iOS/Android apps and web server which are needed for these companies and clients. I will do my best to satisfy clients.

    $44.44 /hr
    1,054 hours
    4.93
  5. Muhammad Rehan Abbasi

    Muhammad Rehan Abbasi

    Free Lance Application Developer

    Pakistan - Tests: 4 - Portfolio: 4

    I am Software Developer by profession carrying an Engineering Degree in Computer Software. I am very determined and eager to prove my skills and competencies. I carry a good experience of over 3 years in software application development using a wide variety of tools. My core competencies include C#, C++, Java, ExtJs and Java Script programming languages. I am also quite comfortable with database tools & technologies such as SQL Server, MySQL and Oracle.

    $7.78 /hr
    492 hours
    4.93
  6. Olha L.

    Olha L.

    SW Test Engineer

    Ukraine

    Over 8 years (25 projects) of experience in full life-cycle of development business applications. quality assurance, quality control and business analysis. Projects in the business areas such as Finance, Healthcare, Real-estate, E-commerce, ERP, CRM etc. Projects Web, desktop, embedded, including complex system. My responsibilities in this respect include: • establishing and support the QA process • requirements analysis, business analysis, risks analysis and measurements • initiate and maintain documentations like Vision, SRS, User story, acceptance criteria, test strategy/plan/design/cases/scenario/checklists, tractability matrix, metrics, risk analyze, • tests execution (any type of manual testing) • leading QA team and controlling QA process throughout the project life cycle • evaluate the results , document the deviations from expected results I have taken the following positions: • Test and QA Engineer • QA Team Lead (up to 10 team members) • Business Analysts • Consultant • Mentor • Lecturer • SCRUM experience • BA experience Result-oriented, high personal standards, attention to details. Responsible and proactive.

    $10.00 /hr
    18 hours
    5.00
  7. Rana Muhammad Mateen

    Rana Muhammad Mateen

    iOS/Android Application and Game Developer, Php Software Engineer

    Pakistan - Tests: 1 - Portfolio: 11

    Top Notch Mobile Apps developer with skills to develop iOS/Android applications and games. My aim is to give quality work and stable product to the clients. I have worked on variety of apps (social, medical, business, games) with API's like Google Maps, Location Services, In-App Purchases, Push Notifications, Third party payment system, Third Party ads, Analytics, Social Media Integration, Local Data Storage, Online/Offline Data Syncing and much more.... I have worked a lot on web services based applications (REST/SOAP with JSON/XML Parsing) and have also worked on communication with our own servers and cloud servers like PARSE.COM and STACKMOB. I am really good in using open source components for customizations. Here are some of apps that i have worked on and submitted to app store. Crescent Point Energy: An app to stay connected to Crescent Point Energy news, stock quote info and presentations. https://itunes.apple.com/us/app/crescent-point-energy/id894946901?ls=1&mt=8 Locist: Its a location based social networking app. https://itunes.apple.com/us/app/locist/id520966167?mt=8 iFussss: Its video capturing app with geo location, hash tagging. https://itunes.apple.com/jp/app/ifussss-app/id694743097?mt=8 TV ALB: App for videos and music streaming along with news and events broadcasting. https://itunes.apple.com/us/app/tvalb/id437780153?mt=8 Daily Drive: An app that delivers you a greeting card daily and allows you to see the cards according to your mood. https://itunes.apple.com/us/app/daily-drive-volume-one-30/id864887477?mt=8 Check and Cook: An app that help to make delicious recipes according to what you have in your home and allows you to upload your own recipes as well. https://itunes.apple.com/fr/app/check-and-cook/id877126009?mt=8 Fantasy Guru: it is a news app. https://itunes.apple.com/us/app/fantasyguru.coms-myguru/id551933481?mt=8 Rehab Minder: Its a medical app for patients https://itunes.apple.com/au/app/rehab-minder-therapy-assistant/id647025352?mt=8 Shapenut: An app with exercise tutorials. https://itunes.apple.com/us/app/shapenut/id690015722?mt=8 Weight Loss By Formula: App that helps you to loose your weight. https://itunes.apple.com/us/app/wt-loss-bf/id709388684?mt=8‎ cocos 2d Game iFrogger: https://itunes.apple.com/us/app/ifrogger/id587404667?mt=8 cocos 2d Game Stick Heroine: https://itunes.apple.com/app/id965795740

    $15.56 /hr
    236 hours
    4.96
  8. Facundo F.

    Facundo F.

    Computer Scientist

    Argentina - Tests: 3

    Self-motivated to research and provide high-quality solutions to real world problems. I'm an algorithm specialist mainly focused on distributed systems and machine learning. On the past I have worked on high performance computing (mainly for scientific applications), using CUDA, OpenCL and MPI. I love to build scalable solution to big problems, and I get really fascinated with challenging back-end and algorithmic issues. I'm also very interested in the research and development of challenges human-computer interaction tasks, including natural language processing, computer vision, machine learning, etc. My experience includes: - C, C++, Python, Django, Scala, Akka. - High performance computing: CUDA, OpenCL, MPI. - SQL & NoSQL, Elasticsearch, Hadoop. - Algorithms & Data Structures. - Data Analysis & Machine Learning. - Semantic Web. - Distributed Systems.

    $44.44 /hr
    209 hours
    5.00
  9. Khoa Nguyen

    Khoa Nguyen

    Senior Winform, WCF, ASP.NET, Extjs, SSRS / RDLC, Telerik, DevExpress

    Vietnam - Tests: 2 - Portfolio: 3

    Experienced with technologies and frameworks: - WinForm with C#, VB.NET, DevExpress, Telerik UI libraries - ASP.NET (MVC) with ExtJS, Ext.NET, jQuery, Kendo UI, and DevExpress - WCF, Web API, Entity Framework - SSRS / RDLC reporting - MS-SQL Server / T-SQL Typical past projects: 1. 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 - MS SQL Server 2012 2. 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 - Microsoft Enterprise Library - MS SQL Server 2012 3. Insurance claim handling: A desktop application to handle insurance claims. The system was developed using VB.NET, Entity Framework, and DevExpress with a lot of T-SQL coding via stored procedures. Technologies used: - VB.NET - Entity framework - DevExpress - MS SQL Server 2012

    $16.67 /hr
    1,384 hours
    4.89
  10. Uladzimir L.

    Uladzimir L.

    Fullstack javascript developer

    Belarus - Tests: 3 - Portfolio: 1

    Hi! My name is Uladzimir and I'm reliable and highly skilled fullstack javascript developer with over 5 years of experience in IT and more than 2 years in javascript. Right now my main focus is: - Frontent: AngularJS(code contributor), Backbone.js, React.js - Backend: Node.js, io.js - Mobile development: Cordova/Phonegap, Ionic framework As well I took part in architecture development of several distributed, scalable and high-loaded solutions like credit history management system and airfare search engine. In my free time, I like to work on my own projects, that's why I can give you some advice for your product. I always try to keep my hand on the pulse of technologies and play with some not mainstream technologies like Scala, Golang etc. I look for new challenges and great opportunities to design and develop different projects. I always try to keep my customers happy. I do opensource a bit. You can check out my github account: https://github.com/lugovsky As well you can check out my LinkedIn profile: https://www.linkedin.com/profile/view?id=301319723 Feel free to contact me, you won't regret :).

    $55.56 /hr
    198 hours
    4.98