Top Upwork Freelancers

Clear all filters
  1. Michael Winter

    Michael Winter

    iOS developer

    Germany - Last active: 1 month ago - Tests: 7 - Portfolio: 6

    I am a software developer based in Berlin, Germany with more than a decade of experience. During the course of my professional career I had the chance to work for a variety of different companies and clients including EA Sports. As a freelancer, I am strongly focused on iOS development. I can complete smaller projects on my own or work on larger projects as a member of a team. You can expect a seasoned and reliable professional with good English skills who understands client needs and pays great attention to detail. My main skills are: C/C++ Objective C iOS SDK cocos2d

    $60.00 /hr
    831 hours
    4.93
  2. Michael Ravits

    Michael Ravits

    Full-Stack Software Engineer

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

    I am a Full Stack Developer with over 9 years of experience in the industry, working both on Web as well as native applications. While I excel at working with a team, having experienced managing a remote group of developers, I am also capable of single-handedly delivering projects from start to finish. With my skills and experience, I always strive to produce clean, robust and highly tested code for every project. Having a very broad experience with numerous tools/languages and technologies, I specialize in building modern web applications and high-scale data processing pipelines. My language of choice is Clojure. Some of the technologies I've worked with in recent projects: - Server side development on the JVM * Clojure * Cassandra * ElasticSearch * Java * Kafka * Redis * Samza * Spark * Storm - Large and small client side applications in ClojureScript * Om * Reagent * ReactJS As a technology enthusiast I enjoy utilizing these cutting-edge tools to deliver projects quickly and efficiently.

    $79.77 /hr
    845 hours
    5.00
  3. Dmitry Sytchev

    Dmitry Sytchev

    Asterisk/Freeswitch/Kamalio expert, VoIP engineer, Linux administrator

    Russia - Last active: 1 month ago - Tests: 7 - Portfolio: 1

    I have more than 10 years of experience in installation and support of carrier-grade VoIP services based on Asterisk, OpenSIPS, Kamailio, Freeswitch and proprietary SIP/VoIP software. My professional interests are Callcenters, automated dialer systems and integration of VoIP software with company information flows. You can rely on my strong engineering and programming skills for projects starting from single VoIP server to a complete wholesale/carrier VoIP solutions including billing, call data analysis, security and fraud prevention. I have developed complete SIP solutions for VoIP carriers worldwide: Proxy/Registrars, IVR, prepaid systems, multi-tenant VoIP switches, hardware PSTN gateways (Cisco AS5300/5500, Audiocodes Mediant 2000, Quintum Tenor). I have experience in setup, administration and security of Asterisk, FreePBX, Elastix and FreeSWITCH PBX installations. As a programmer I use PHP, Javascript (both client-side using jQuery and Angular.js and server-side with node.js), Perl (system scripts/applications, Mojolicious webapps). I also have experience in development and administration of MySQL and Microsoft SQL Server databases. I'm experienced network engineer, skilled in routing and switching, general network architecture planning and deployment, network monitoring and security, including HA solutions (heartbeat/pacemaker). I use Zabbix and have some experience with Nagios and other monitoring software. I can also offer you consulting support in VoIP and network technologies.

    $33.33 /hr
    93 hours
    4.96
  4. Mykhailo Smyrnov

    Mykhailo Smyrnov

    Java Developer

    Ukraine - Last active: 1 day ago - Tests: 2

    I am a Java Developer with 3+ years of experience. I have skills in building Java-based web-applications using following technologies: - Core Java - JavaEE (Servlet, JSP, JSTL, JDBC, JPA) - Spring Framework (Spring MVC, Spring Security) - Hibernate - JavaScript (jQuery, AngularJS) - JUnit - Maven - Git I also have a great desire to start working with Scala-based technologies: Scala Lang, Play Framework, Akka, Slick. I am looking for opportunities to apply my skills. Additional language: Russian (fluent).

    $17.00 /hr
    1,765 hours
    5.00
  5. Joshua H.

    Joshua H.

    Experienced Java and Web Developer

    Australia - Last active: 3 days ago - Tests: 5 - Portfolio: 1

    As an experienced developer I can help you through all the stages of software development: analysis and design, coding, testing and maintaience. I've delivering rich web and software applications in Java, Javascript, HTML/CSS and Python and can build a solution or fill your programming needs. I am a professional web and software developer with over 11 years experience. I am passionate about solving problems and delivering high quality solutions on time and to requirements. Using a professional approach and best practices I can write and provide high quality code. Main skills: * (Enterprise) Java * Spring * Hibernate * Oracle, MS SQL, MySQL Database systems * HTML5 * CSS * Javascript * JQuery * Python * Django

    $45.00 /hr
    78 hours
    4.90
  6. Ivan K.

    Ivan K.

    Backend developer

    Russia - Last active: 8 days ago - Tests: 2

    My preferred languages are Ruby and Perl, although I write PHP code quite often too. I've had a full-time job as a backend developer for the past 5 years. I'm familiar with a pretty wide spectrum of technologies in backend technology stack: relational databases (MySQL, PostgreSQL), NoSQL (MongoDB, Redis), message queues (RabbitMQ). I'm comfortable with Linux and can do server setup and some common sysadmin tasks. Currently I'm mostly looking for part-time contracts.

    Groups: Coding Champs

    $35.00 /hr
    53 hours
    4.97
  7. Nguyen Hoa

    Nguyen Hoa

    Java,Spring,AngularJS,Struts,HTML,CSS,Swing,HYBRIS expert

    Vietnam - Last active: 1 month ago - Tests: 2 - Portfolio: 5

    - Intensive knowledge in Java Core, Oriented-Object-Programing, Design pattern - 6 years experience in Java web programming, 3 years experience in Hybris E-commerce platform - J2EE Technologies: Spring, Struts, JSP, JSF, Servlet, Hibernate, Solr - HTML5, Javascript, CSS, SASS, Very good at AngularJS XML, JSON, XSL - HYBRIS platform expert (Hybris E-commerce Certificate) - Database : MySQL, MongoDB, PostgreSQL - Java Desktop Application (Swing, AWT,...) - Java certificates: SCJP, WCJP. - Bachelor in Computer Science. - English communication fluently

    $8.00 /hr
    1,235 hours
    5.00
  8. Vasil T.

    Vasil T.

    Senior Project Manager, Java/Android developer.

    Belarus - Last active: 16 days ago - Tests: 5

    Project/department manager with over 8 years (since 2007) of management experience and 15 years overall (since 2000) experience in IT. Got reasonable technical background by starting as a junior Java developer and growing up to Java department manager. Good intercultural communication skills. Willing to solve complex tasks. Doing some Android development as a hobby and to keep technical knowledge up to date. Android: GPS (NMEA), Bluetooth, Accelerometer, Maps, GCM, Google Play Services (Leaderboard, Achievements), AdMob, Google Analytics, Chat (XMPP, Smack, OpenFire), Voice Recognition, Augmented Reality (OpenCV)

    $20.00 /hr
    69 hours
    5.00
  9. Konstantin K.

    Konstantin K.

    QA Engineer

    Russia - Last active: 2 days ago - Tests: 3 - Portfolio: 4

    "Think like a bug, act like a bug, and you will find a bug!" I'm experience with emphasis on Quality Assurance(Manual & Automation testing) with Web based, Client/Server and Standalone applications using tools like SOUP UI, Fitnesse and Selenium WebDriver with strong businesses understanding knowledge. Well versed with QA standards and methodologies and hands-on knowledge of all phases of the Software Development Life Cycle (SDLC). I have some facts which end your search and start your smiles,because you found a required specialist.. • Expertise in creating Test Plans, Test Scenarios and Test cases. Analysis of software documentation from business, technical and functional Requirement. • Experience in Functional testing, Integration testing, System testing, Regression testing, User Acceptance, Black box testing, UI testing, browser compatibility testing, Performance testing in different stages of SDLC. • Expert in Automation regression testing using Fitnesse, Selenium WebDriver. Creating, updating and executing the scripts and tracking the defects, Logging the defects and reporting the defect (bug). • Analysis of testing documentation and requirements with specifying comments for correction. • Strong SQL knowledge for test data verification. • Involved in Estimation Management of efforts of the testing process. • A good team player with excellent time management skills having profound insight to determine priorities, schedule work and management of testing team.

    $14.44 /hr
    427 hours
    5.00