Senior Java Developers & Programmers

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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.

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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, 623 Java projects are completed every quarter on Upwork.

623

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: May 1, 2015
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  1. Nikolay C.

    Nikolay C.

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

    Ukraine - Last active: 10 hours 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
    14,205 hours
    5.00
  2. Aldrin L.

    Aldrin L.

    Architect, Backend Engineer (Scala, Java, Hadoop)

    Brazil - Last active: 6 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
    3,102 hours
    4.82
  3. Enrique Matos Alfonso

    Enrique Matos Alfonso

    Professional of Computer Science

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

    I graduated from the University of Havana and worked in several fields of the Computer Science, mainly related to Artificial Intelligence. Then I came to Germany and completed a master degree on Computational Logic in 2014. I have published articles about Genetic Algorithms and Classification Techniques in machine learning applied to other fields like Electrical Engineering and Propositional Logic. I look forward to applying more Artificial Intelligence techniques to to solve interesting problems in other fields.

    $33.33 /hr
    163 hours
    5.00
  4. David M.

    David M.

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

    United States - Last active: 3 days ago - Tests: 7 - Portfolio: 1

    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
    842 hours
    5.00
  5. Jordan Ringenberg

    Jordan Ringenberg

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

    United States - Last active: 3 days ago - Tests: 3

    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

    $60.00 /hr
    99 hours
    5.00
  6. Bilal Siddiqui

    Bilal Siddiqui

    Java and XML consultant

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

    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
    545 hours
    4.96
  7. Pedro Tavares

    Pedro Tavares

    Java | GWT | Spring | Mobile Cloud Consultant

    Ireland - Last active: 7 days ago - Tests: 2 - Portfolio: 1

    Pedro is a Java/J2EE/JEE Consultant end-to-end Developer and Architect with over 15 years experience, in sectors such as Healthcare, Telecoms, Banking/Payments and the Public Sector. Master in Java, in the top 5% as tested by Smarterer.com Expert in Spring, top 10% http://smarterer.com/PedroTavares Also on: linkedin.com/in/pedroalexandretavares Pedro has experience across the full Software Development Life Cycle (SDLC), being an enthusiast of Lightweight/POJOs design, Agile Methodologies, SCRUM and Test Driven Development (TDD).

    $40.00 /hr
    6 hours
    5.00
  8. Robert Kluver

    Robert Kluver

    Lifetime Internet Guru

    United States - Last active: 2 days ago

    Well before the World Wide Web was a common phrase as it is today, before most people even owned a home computer I was programming code in a variety of languages for a variety of network related projects back when you had to put the handset of a telephone on a 300 baud modem. Trillions of lines of code under my belt and a mind that functions like a computer processing unit I not only understand today's most popular programming languages, I know how the languages themselves came to be. I am an expert who has owned, operated or worked with thousands of technology based businesses over the past 25 years. More than a programmer, I am a valuable consultant to any business wishing to build or improve any online enterprise. My work is relatively fast, accurate, functional and most importantly well constructed based on your exact needs. I do all of my own work but will bring in experts if necessary to accomplish the goals of your organization. I am an American living in Pennsylvania.

    $55.00 /hr
    7 hours
    5.00
  9. Jeremy Nagel

    Jeremy Nagel Agency Contractor

    Zoho/PHP/Angular JS/Data Analysis specialist

    Australia - Last active: 10 days ago - Tests: 5 - Portfolio: 3

    Data scientist turned freelance developer specialising in Zoho Creator/CRM + PHP/Angular JS. I trained as a research scientist and as a programmer, graduating from Monash Uni with first class honours in Bioinformatics/Data Mining in July 2011. Since then I have spent 3 years freelancing as a developer/consultant specialising in the Zoho Suite + custom PHP websites. My clients include Microsoft, Intel, Yarra Valley Water, PixcPhotos.com as well as numerous SMEs. I am a native English speaker living in Australia. My communication skills are first rate: I have won numerous prizes for my writing (e.g. a trip to Switzerland) and public speaking (through Toastmasters). Over the last five years, I have built a large number of websites and software applications in Zoho Creator, PHP, Java, .Net and Python. This means I understand web and software development and I can also explain these concepts to non-tech experts. My current focus is on the Zoho Suite. I started using the products myself, and love them so much that I now make a living from setting them up for my clients. I can build just about any application you like in Zoho Creator (view my portfolio for details). I can help boost your sales by setting up Zoho CRM for you. If customer service is your focus, I can set up Zoho Support for you. And if you're using other software (e.g. accounting packages), chances are I can integrate them into Zoho so your backend systems will play together nicely. A note about pricing: Usually I work on a fixed price basis. I will work with you to develop a project specification and then quote to do the whole job rather than working on an hourly basis. This means you have the peace of mind of knowing exactly how much a project will cost. If the scope changes, we will obviously need to discuss a change in price, but I think it is crucial that your expectations are clear as to how much you will be outlaying. The hourly rate on my profile is for the subcontractors working for me. I generally act as a project manager supervising my developers rather than doing the coding myself because I've got too many projects to handle myself. If you do want me to work exclusively on your project, my rate is $200/hour. Generally people prefer to work with me as a project manager because it works out to be more cost effective, faster and just as high quality because I conduct code reviews and my team and I have an intensive manual and automated QA process before handing over work. Skills: Zoho CRM, Zoho Creator, Zoho Books, PHP, Laravel, Angular JS, jQuery, Fat Zebra, Xero, Base CRM

    Groups: LoginRadius

    Associated with: Nuanced IT (agency)

    $66.67 /hr
    629 hours
    4.99
  10. Dhaval S.

    Dhaval S. Agency Contractor

    Android,iOS native/hybrid apps, javascript/cordova/parse

    India - Last active: 26 days ago - Tests: 9 - Portfolio: 15

    Developed native and hybrid apps on Android and iOS. Please visit http://dhavalsharma.com to know more. Also have developed in java, objective-C, GWT, python, django, jquery development on Linux, Google App Engine,android and iOS platform. I have developed applications in extjs/sencha touch. I have also done workflow automation using Google Apps Scripts in Google Spreadsheets for multi-location distribution and aggregation of reports.I also have extensive IT experience in delivering and executing IT based solutions and projects for over 16 years on multiple technologies and platform for global clients.

    Groups: Android

    Associated with: greenwalk

    $33.99 /hr
    2,380 hours
    4.59