Top Upwork Freelancers

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  1. Alexander C.

    Alexander C.

    Scala / Java / Haskell developer, Full Stack Engineer, Consultant

    Russia - Tests: 2 - Portfolio: 2

    Java developer with 8 years of experience. Now also Groovy(2 years) and Scala(1.5 years) developer. Java: Hadoop, Nutch , Lucene/SOLR/ElasticSearch, Morphia(MongoDB ORM), parsers/crawlers(using Apache Httpclient, HtmlUnit and own microframework), Web MVC(Struts 1.x/Grails), Java Desktop Applicatins(Swing) / Applets, webservices (w. Restlet framework), RabbitMQ Java client, Riak Java Client Scala: PlayFramework 2.x, Lift, Akka, ReactiveMongo Groovy: Groovy scripts / Gant build scripts / Gradle Databases: SQL(PostgreSQL/MySQL), MongoDB, Riak, SOLR/ElasticSearch PHP scripts, linux(fedora/centos/ubuntu) server administration, SVN / Git, SEO methods/scripts, affiliate marketing. Check my blog(chepurnoy.org)/GitHub(kushti) also.

    $60.00 /hr
    1,026 hours
    4.99
  2. Ruben Semerjyan

    Ruben Semerjyan

    Inovative Mobile VOIP, Social, Audio/Video Streaming Developer

    Armenia - Tests: 2 - Portfolio: 1

    I am an innovative, extremely detail oriented and perfectionist Software Development Architect, with expert knowledge in VoIP, audio/video streaming and processing, messaging and social media. My a little over 8 years of experience in VoIP industry gave me a strong knowledge of the protocols, technologies and available solutions. 3 years of successful mobile applications development, architect and project management gave me confidence in creating robust and technologically challenging applications. I am passionate about developing robust, innovative and leading edge applications, getting increasingly challenging assignments and applying disruptive technologies. Looking for a work on technologically challenging projects (in an agile environment preferably), while offering my expert knowledge base, ability to learn quickly and apply new techniques. I usually bid slower than others, because of reading the full job description, trying to estimate all requirements, needed technologies and solutions.

    $25.00 /hr
    28 hours
    5.00
  3. Dmitry Sytchev

    Dmitry Sytchev

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

    Russia - 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
    4.95
  4. Lai Tash

    Lai Tash

    Python developer

    Russia - Tests: 3

    Hello and thanks for your interest in my profile. I've started my programming path in mid 90th, starting from atari and msdos programming. Approximately five years ago i've turned my face on Python, which now became my prefered programming language and the one i have the most experience with, both in desktop and web development.

    $20.00 /hr
    396 hours
    4.94
  5. Moiz A.

    Moiz A.

    Certified Information Systems Auditor (CISA),CISM, IS Consultant

    Pakistan - Tests: 1 - Portfolio: 1

    Experienced associate who have been involved in Security Reviews, Information System Audits, Revenue Assurance Reviews and Special Assignments at various large and medium-sized organisations. My core area of expertise includes assessment of internal control environment for information systems and critical IT processes; evaluating system of internal control and risk management; pre & post implementation reviews; security reviews of operating system, database and applications/ERP(s)

    $11.11 /hr
    191 hours
    5.00
  6. Joaquín González Carrasco

    Joaquín González Carrasco

    Oracle performance tuning DBA/developer

    Spain - Tests: 4

    I am an experienced Oracle DBA/developer. I've been working in jobs related with Oracle Database since 2002. I've been focused around managing Oracle DB, troubleshooting Oracle performance, tuning Oracle instance, relational database design and development and tuning of SQL and PL/SQL to improve performance. Also SQLServer, MySQL and MongoDB Knowledge. You can check my linkedin full profile at: http://es.linkedin.com/in/joaquingonzalezcarrasco/en You can check my pl/sql & database design knowledge at: https://plus.google.com/103695399328541337041 Currently ranked 42th among 10.000 players all over the world, playing daily quizzes about PL/SQL since 2010. Currently ranked 4th among 500 players over the world, playing weekly quizzes about Database Design since 2013. I'm currently available only for part time jobs.

    $20.00 /hr
    27 hours
    4.70
  7. Muhammad Imran Afzal

    Muhammad Imran Afzal

    C/C++ Developer,Device Driver,Kernel modules and Bash scripting Expert

    Pakistan - Tests: 4 - Portfolio: 1

    I have 6 years of experience in Linux development and administration. Device Drivers, Kernel Porting, Kernel Modules, Development in networking protocols, gcc/g++ and Python are my expertise. I have strong knowledge in Linux internals including kernel specifics and system calls. I have work experience with mips64 based Cavium's OCTEON multicore netwrok processors. I have worked on network protocol offloading in this. I have the ability TO DO.

    $22.22 /hr
    13 hours
    5.00
  8. Diwas Pathak

    Diwas Pathak

    Experienced Java Developer

    Nepal - Tests: 2 - Portfolio: 4

    I've been in the web/mobile development field for more than 6 years. When I started developing JavaEE applications for a local company. I've worked on a variety of applications using numerous frameworks like struts, spring MVC, hibernate,JSF,etc. Most of my web application has been developed using MVC design pattern. I am able to not only build applications from the ground up but also to add functionalities to existing application, open source and commercial applications. As an experienced Developer i give special attention in the security and understand risk involved in web application. Apart from being a web developer I am also a experience with databases like MsSql, MySql,CTree,etc. Besides this I use to teach Java courses to professional working in other companies and Engineering students.

    $12.22 /hr
    131 hours
    4.77
  9. Huong Le

    Huong Le

    FileMaker Developer/ Database Design/ SQL/ MySQL/ PHP

    Vietnam - Tests: 2 - Portfolio: 3

    Hello, I work as a FileMaker developer with five years experience in FileMaker. I have done a variety of small and large projects for MAC/PC, iPad and iPhone. I can integrate multiple files system into either a single file or a data-separated solution, connect FileMaker database to Website and publish FileMaker database on Web by using WebDirect or PHP. I'm working on FileMaker Pro as well as Pro Advanced and FileMaker Server 12, 13, 14 now. I have completed successfully many solutions and get the clients satisfaction. I am proud to provide the most effective solution to my client. All of your project appeal to me, I am pleased to work and offer the best solution to you. I speak English fluently and improve my skills everyday. I am a quick learner, patient and pay attention to detail. My goal is to always develop a powerful, user-friendly database. I can fully assure that you will be satisfied with the quality of my work. Thank you for hiring me.

    $15.00 /hr
    48 hours
    5.00
  10. Ralph Swartwood

    Ralph Swartwood

    Certified WebSphere Administrator

    United States - Tests: 1

    I have 10 years experience working with WebSphere Application Server version 3, 4, 5, 6 and 7 on AIX, Solaris, HP/UX, Linux, zLinux and Windows. I am certified in versions 5, 6 and 7. I am looking for short and long term engagements including installations, resolution of a specific problem and ongoing support. I also have experience working with WebSphere Portal Server, Process Server, IBM HTTP Server and Apache. I developed JACL and Jython scripts to automate application deployments and to make configuration changes. I am very familiar with Java programming of servlets, JSP, SQL and JMS. I developed a Nagios plugin that monitored JVM availability and Performance Monitoring Infrastructure (PMI) metrics. I can analyze thread dumps for JVM hang problems and heap dumps for OutOfMemory issues. I also have experience with DirectConnect and training in DataPower appliance administration.

    Groups: TrueBLUE

    $50.00 /hr
    44 hours
    4.60