Senior Java Developers & Programmers

Get Your Java Programming Project Started Today!

Post your Java projects on Upwork and hire expert software engineers and senior Java developers. They can create mobile applications for Android and iOS, redevelop Android widgets, modify and add new Java scripts to your custom Java software, or develop GUI applications with the Swing GUI widget toolkit. The java developers on Upwork are experienced in Java persistence frameworks (like Hibernate), web development, security or database frameworks and Java project lifecycle management tools (like Maven). They can also check, fix or add new Java classes into your Java code, or manage your software debugging, quality control software development or testing tool programming.

Java is a class-based, object-oriented computer programming language that is ideal for cross-platform application development. It comes with a library of commonly used classes and utility functions, called the Java API. On Upwork, the world’s largest online workplace, companies hire experienced Java architects and software engineers to develop all kinds of cross-platform applications, from torrent clients and media players, to helpdesk tools and mobile apps.

Browse Java job posts for project examples or post your job on Upwork for free!

Java Job Cost Overview

Typical total cost of Upwork Java projects based on completed and fixed-price jobs.

Upwork Java Jobs Completed Quarterly

On average, 584 Java projects are completed every quarter on Upwork.

584

Time to Complete Upwork Java Jobs

Time needed to complete a Java project on Upwork.

Average Java Freelancer Feedback Score

Java Upwork freelancers typically receive a client rating of 4.70.

4.70
Last updated: June 1, 2015
More options
Clear all filters
  1. Nikolay C.

    Nikolay C.

    Brainbench certified JSE/JEE dev, DB dev, Sys-Arch

    Ukraine - Last active: 1 day ago - Tests: 2 - Portfolio: 11

    Would you like to find a powerful Java-dev? If so, please read further... 1. Intentions I'm working as a free-lancer more than 2 years already, and worked > 12 years in scientific and software engineering areas. I'm here because I'm looking worldwide for interesting work related to software development using the following technologies (some or all): - Java 5/6/7 (JSE, Swing, CORBA, Web Services, etc.) - JEE5/6 (EJB3, JSF, Hibernate, etc.) - GWT, Spring, Struts, etc. - And other JSE/JEE-related frameworks - GlassFish, Tomcat, JBoss, Jetty, etc. - JME (CLDC 1.1, MIDP 2.0) and Android - Maven, Ant, etc. - Oracle, MySQL, PostgreSQL and other DBMS - Some sub-tasks could be related to C/C++ with STL (but NOT the whole project!) - UML and/or Agile Modeling - Well-organized Agile processes - Etc. It would be nice to be involved into software concepts and architecture development. Also it would be nice to have possibilities for applying my initiative and creativity. I'm ready to work as a free-lancer for the beginning up to 40+ hours per week), and you may hire me as a full-time employee as well. I'm ready to move mostly to any country or city. In such case I'm ready to start as a developer (or senior developer), but with possibility to grow up to TL, and further up to SA or PM (of course, starting from TL or SA would be nice). 2. Education - University Master Degree in the area of Informatics and Computer Systems 3. General Skills I have a wide working and scientific experience with dozens of technologies (> 14 years). The most deep experience I have with the following techs: - JSE5/6 and J2SE (Java Core, Multithreading, AWT, Java2D, Swing, CORBA, WebServices, Networking, etc.) - since 1998 - JEE5 (EJB3, Hibernate3, JSF, CometD, Jetty, Tomcat, JBoss, GlassFish) - about of 5 years - J2ME (CLDC 1.1, MIDP 2.0, WMA) - about a year - Other Java techs (Jakarta Commons, Log4J, Velocity, Maven, Ant, etc.) - many years - Android development (support about 0.5 years) - C/C++ and STL - since 1995 (STL from 2001) - Oracle 9i/10g, MySQL, PostgreSQL, InterBase - since 2000 - OOA/OOD/OOP and UML Modeling - since 1995 (UML from 2001) Large experience with the following platforms and tools: - Windows - since 1995 - Linux/UNIX - since 1997 - MS Office (incl. Visio and Project) and Star/OpenOffice - since 1997 - IntelliJ IDEA, NetBeans, Eclipse - since 2001 - C++Builder and Delphi - since 2000 - PL/SQL Developer - since 2005 - Enterprise Architect and other UML tools (Rational Rose, Poseidon, etc.) - since 2001 Git, SVN and CVS - since 2001 Management Skills - since 2004 (worked on TL and PM positions) Architect Skills - since 2000 (designing concepts, business models and architectures for quite complex scientific, B2C and B2B applications) Language Skills: - Russian - native - English - fluent, working language since 2001, ~1000 pages of docs written - German - intermediate (quite fluent, but non-perfect) - Ukrainian - can understand in 100%, cannot speak/write fluently 4. Contacts - You can contact me via oDesk. Usually online (GMT): - 10:00am - 5:00pm - 7:00pm - 10:00pm

    $40.00 /hr
    14,279 hours
    5.00
  2. Alvaro Gomez

    Alvaro Gomez

    Computer vision, Machine learning and pattern recognition expert

    Peru - Last active: 3 days ago - Tests: 5

    M. Sc. in Computer science with a mention in image processing and pattern recognition. Im a Computer vision specialist with over 4 years of hands on experience on a variety of computer vision applications. I have strong background in maths and computer science, research skills in computer vision, senior programmer in C/C++ and Matlab. On the past years i focused on the development of computer vision solutions for real world problems involving extensive research and ground breaking solutions. I have over 3 years experience working with OpenCV and porting image processing solutions to mobile platforms for real time processing. Im very interested in the research and development of a new challenge computer vision tasks including pattern recognition, machine learning and image analysis. I am seeking opportunities to develop and maintain complete computer vision applications, whatever standalone or back-ends for smart websites or light weight solutions for mobile applications.

    $33.33 /hr
    3,735 hours
    4.96
  3. Aldrin L.

    Aldrin L.

    Architect, Backend Engineer (Scala, Java, Hadoop)

    Brazil - Last active: 7 days ago - Tests: 12 - Portfolio: 1

    Over the past 15 years I've worked with projects ranging from Startups to Fortune 100s. From C++ to Scala, past assignments involved: - Protocol Design in C++/Delphi - Java API Publishing - Maven Plugin Development - Distributed Systems using RESTful backends - Scala / Akka Design - Jenkins Plugins Writing On a daily basis, I spend between Systems Architecture, Build Planning, for Hadoop and Restful Backends, specially under Amazon Web Services. Oh, I'm also a Cloudera Certified Administrator and Developer. Favorite platforms include Scala, Python and General Java. See my full profile for more descriptions and feel free to browse my github and bitbucket profiles at the addresses below: http://github.com/ingenieux http://bitbucket.org/aldrinleal Favourite customers involve pragmatic teams, with contant online presence, and direct involvement with the end customer, and a problem involving legacy and the next generation Feel free to discuss our next project - I'm always looking for the next challenge!

    Groups: LoginRadius, Microsoft Certified Professionals

    $55.56 /hr
    3,112 hours
    4.82
  4. Alain C.

    Alain C.

    Java, Web and Google Maps Engineer

    United States - Last active: 7 days ago - Tests: 2 - Portfolio: 5

    Experienced professional with 6 years of experience of Java/J2EE web projects. I have a good knowledge of Google products and APIs as well (Google Maps, KML/KMZ). I also have a strong testing background (JUnit, JMock, Cobertura, Concordion, Selenium, Webdriver...) and developed a couple of testing frameworks based on these technologies. Specialties include: Java, J2EE, JEE, KML, KMZ, Google, Maps API, Javascript, AJAX, XML, SAX, DOM, JAXB

    Groups: Application Developers Alliance

    $74.00 /hr
    22 hours
    4.91
  5. Jordan Ringenberg

    Jordan Ringenberg

    PhD in Computer Science, Expert in C++, Python, MATLAB, Java, Web Dev.

    United States - Last active: 5 days ago - Tests: 3 - Portfolio: 1

    Expert knowledge and over seven years of experience in object-oriented programming and agile development utilizing C++, Java, Python, Visual Basic, Objective-C, C#, MySQL, shell scripting, and web programming Software engineering and computer vision expertise, with numerous peer-reviewed published outcomes. Specialties include object-oriented design, algorithms, image processing and computer vision, and 3D modeling Expert-level experience in major development platforms including .NET, MATLAB, Linux/UNIX, Eclipse, and Cocoa Strong written and verbal skills, with proven track record in university teaching and scholarly publications

    $70.00 /hr
    106 hours
    5.00
  6. David M.

    David M.

    Expert Excel VBA/C# Developer and Oracle-Certified Java Programmer

    United States - Last active: 5 days ago - Tests: 7 - Portfolio: 2

    I'm an expert Excel VBA/C# Developer with over 6 years of experience in developing Excel Macros, Add-Ins and Advanced Spreadsheet Applications. I can streamline your reporting, automate your spreadsheets, as well as create full-scale dashboard applications and powerful add-ins. I have tested within the top 30% of all VBA Programmers, as well as within the top 20% in Microsoft Excel on oDesk's sister site, Elance.com. I am also an Oracle Certified Java Programmer with experience in Finance, Statistics, Game Development, Data Analysis and Application Development. Tested as above average in knowledge of the Java SE7 programming language among certified Java Programmers on oDesk.com. I am skilled in Visual Basic for Applications (VBA), testing within the top 30% of all VBA Programmers, as well as within the top 20% in Microsoft Excel on oDesk's sister site, Elance.com. I have experience in Macro Development and Excel Add-In Development such as Web Scraping and Advanced Automation and Calculation for numerous uses, utilizing C#. Over 6 years of Programming experience. Responsible for developing highly sophisticated Excel Spreadsheets for High Profile Banking Transfer Agency, increasing productivity in that area by over 90%. I enjoy what I do.

    $72.22 /hr
    845 hours
    5.00
  7. Bilal Siddiqui

    Bilal Siddiqui

    Java and XML consultant

    Pakistan - Last active: 1 day ago - Tests: 1 - Portfolio: 3

    I am an electronics engineer, XML consultant, technology evangelist, and frequently published technical author. After graduating in 1995 from the University of Engineering and Technology, Lahore, I began designing software solutions for industrial control systems. Later, I turned to XML and built web- and WAP-based XML processing tools, server-side parsing solutions, and service applications. Since 2006, I have focused exclusively on Java- and XML-based open source tools and solutions. A strong advocate of open source tools, I not only design solutions based on them but also train software and IT personnel at Lahore universities in using open source technologies. I am the author of JasperReports 3.6 Development Cookbook (Packt Publishing, 2010). Please see my following articles that I've been writing to display my work. Data visualization, Part 1: Visualize browsing metrics with SVG and D3 http://www.ibm.com/developerworks/opensource/library/os-dataviz1/index.html?ca=drs- Data visualization, Part 2: Use D3 component layouts http://www.ibm.com/developerworks/opensource/library/os-dataviz2/index.html Bonita for business process management, Part 1: Configure a simple workflow http://www.ibm.com/developerworks/opensource/library/j-bpm1/index.html Bonita for business process management, Part 2: Configure forms and variables http://www.ibm.com/developerworks/library/j-bpm2/ Integrate social networks into BPM, Part 1: Collect Twitter data http://www.ibm.com/developerworks/library/j-sb1/ Integrate social networks into BPM, Part 2: Add Twitter data to CRM http://www.ibm.com/developerworks/library/j-sb2/ XML Canonicalization http://www.xml.com/pub/a/ws/2002/09/18/c14n.html http://www.xml.com/pub/a/ws/2002/10/09/canonicalization.html Integrating healthcare services, Part 1: Using an Enterprise Service Bus for healthcare https://www.ibm.com/developerworks/java/library/j-hsb1/index.html Integrating healthcare services, Part 2: Using Apache ServiceMix as a Healthcare Service Bus https://www.ibm.com/developerworks/java/library/j-hsb2/ Design XML schemas for enterprise data https://www6.software.ibm.com/developerworks/education/x-schemadata/x-schemadata-a4.pdf Build configurable workflows with WS-BPEL and IoC, Part 2: Developing and hosting BPEL workflows http://www.ibm.com/developerworks/java/library/j-bpel-ioc2/index.html Deploying Web services with WSDL, Part 1: Introduction to Web services and WSDL http://www.ibm.com/developerworks/library/ws-intwsdl/ Securing Java applications with Acegi http://www.ibm.com/developerworks/library/j-acegi1/ Web Services Security, Part 1 http://www.xml.com/pub/a/ws/2003/03/04/security.html Web Services Security, Part 2 http://www.xml.com/pub/a/ws/2003/04/01/security.html Implementing XML Encryption in Java http://www.xml.com/pub/a/ws/2004/04/21/wss4j.html

    $35.00 /hr
    547 hours
    4.96
  8. Devasia Joseph

    Devasia Joseph

    Web and Mobile Development Consultant Architect

    India - Last active: 4 days ago - Tests: 2 - Portfolio: 2

    Full stack developer, architect and consultant for web and mobile development. I have over 9 years of experience developing complex applications in various technology platforms such as Java .Net,Python, PHP, Javascript, Clojure iOS and Android Platforms. Although my current choice of technology is Clojure running on Java platform I am open to working with other tech stacks too. I have a bachelor's degree in Engineering.

    $35.00 /hr
    514 hours
    5.00
  9. Neil H.

    Neil H.

    Systems Administrator / Developer

    United States - Last active: 2 months ago - Tests: 9 - Portfolio: 1

    I am a Systems Administrator / Developer, available for freelance work on a per diem basis, or for a more long-term project/job. I am fluent in PHP, Python, and Bash, and have a knowledge of Java, C++, and have touched a few other languages.. I have a strong command of Linux/Bash, as well as Administration of both Windows and Linux servers (Specifically cPanel/WHM servers and CloudLinux) on a LAMP stack.

    $90.00 /hr
    0 hours
    5.00
  10. Kurt Waldowski

    Kurt Waldowski

    Programmer, Designer, and Artist || kwaldo.com

    United States - Last active: 1 day ago - Tests: 2 - Portfolio: 3

    Kurt Waldowski is a multi-talented developer that has been creating games, web sites, and web applications for over 5 years. Programmer, designer, and artist, Kurt has taken part in every end of the development process. He is currently attending the University of Michigan to earn his degree in Computer Science. Kurt only bids on projects he is genuinely passionate about, and as a result, he guarantees satisfaction. He often bids with longer time constraints in order to account for potential reiteration. This assures that your vision is brought to life the way it was envisioned.

    $45.00 /hr
    0 hours
    5.00