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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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Last updated: October 1, 2015
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Yohanes G.

Yohanes G.

Full-Stack Java/Groovy/PHP Web Programmer

Indonesia - Tests: 5 - Portfolio: 5

Web programmer with full-stack skill-sets (to develop app from scratch & bring it up online and 7+ years experience in enterprise app development) and a beginner Android (mobile) developer. Skill-sets: * Framework: Groovy & Grails, Struts 2, Spring, Scooter, Hibernate, MyBatis, CakePHP, Node.js, Express.js, Ionic Framework (Angular.js + Cordova) * UI Framework: jQuery, jQuery UI, Bootstrap, Angular.js * Application/web server: Apache HTTPD, Jboss, Tomcat, Jetty, Oracle Weblogic * DBMS: MySQL, PosgreSQL, MSSQL, Oracle DB, MongoDB * SCM: SVN, Git, Jenkins, Ant, Maven, PMD, FindBugs, iReport/Jasper Report * OS: Ubuntu, CentOS, Windows * Cloud Platform: Heroku * Mobile: Android (native & Cordova) Links: * LinkedIn * GitHub * BitBucket

100% Job Success
$11.11 /hr
33 hours

John Comeau

John Comeau

expert troubleshooter, generalist developer, tenacious problem solver

United States - Tests: 2 - Portfolio: 1

"Jack of all trades, master of none" is typically said in a derogatory fashion, but I adopt the title gladly, and you will not likely find more than a few dozen generalists worldwide who can match my troubleshooting and problem-solving skills. I've been programming, on and off, for 40 years, if you count my study of BASIC in 1968, 6 years before I actually got my hands on a computer: the DECSystem-10 at Worcester Polytechnic Institute. As a result of working on computers and microcontrollers of various sizes and capabilities over the years, I have learned to get to the basics of a problem, come up with a prototype solution, and refine it to the customer's satisfaction. My methodology, which I found later is used by many successful programmers, is "build one to throw away"... once the code is working, rewrite it from scratch, correcting the false assumptions made in the first attempt, and refactoring to make a clean, maintainable, codebase. My background in both the electrical/electronics side of things plus years of experience reverse-engineering and improving software on dozens of different architectures gives me the rounded background necessary to take on projects which leave specialists lost. I may charge more than most ($100 is my usual rate, but I found it's unrealistic on Odesk), but when you've run up against a brick wall, I can likely find a way over, around, or through it.

100% Job Success
$100.00 /hr
87 hours

Jigarbhai Patel

Jigarbhai Patel

Expert Programmer, Algorithms Developer, Technical Writer

India - Tests: 3 - Portfolio: 10

"I believe in providing best quality services to my valuable clients." I have received the Bachelor of Engineering degree in Computer Engineering from Hemchandracharya North Gujarat University, Patan, Gujarat, India, in 2005 and the Master of Engineering degree in Computer Engineering from Dharmsingh Desai University, Nadiad, Gujarat, India, in 2008. My Part-time Ph.D. in Computer Engineering from Uka Tarsadia University, Surat, Gujarat, India, is pursuing since January 2013. My research interests include Artificial Intelligence, Computer Algorithms, Optimization, Machine Learning and Lean Manufacturing. I have excellent C/C++/C#/Java programming proficiency. I have one year experience of Programmer and Customer Support Engineer & seven years experience of Assistant Professor in reputed Engineering Colleges. I have successfully developed several projects in C/C++/C#/Java, guided 40 major projects of undergraduate students, 10 research projects of postgraduate students, published 7 research papers in international journals and attended 4 workshops & training programs organized by IIT Bombay & Nirma University. I have excellent proficiency to write high quality articles, blogs and e-books. I have effectively and efficiently solved the following combinatorial optimization problems by designing & implementing various algorithms such as A* search, brute-force-search, breadth-first-search, depth-first-search, branch-and-bound algorithm, hill climbing, greedy algorithm, genetic algorithm etc... in C/C++/C#/Java. 1. Workforce scheduling and routing problems 2. Capacitated vehicle routing problem with time windows 3. Mass transportation problem 4. Traveling salesman problem 5. Crew allocation & scheduling problem 6. Home health care problem 7. Job-shop scheduling problem 8. Tasks allocation problem 9. Packing problem 10. Cell formation problem 11. Machine layout problem 12. Cell layout problem 13. Circuit-satisfiability problem 14. Optimal earthing grid problem for substation earthing system design 15. Subset-sum problem etc… I have also developed projects of neural networks as follows. 1. I have trained perceptron for binary classification which can be used to predict whether a given car is a family car or not. 2. I have also trained perceptron for multiclass classification which can be used to classify the input into one of output classes namely car, human or dog. 3. I have also developed multi-layer feed-forward neural network to learn XOR function. I have taught various subjects at undergraduate & postgraduate level such as Microsoft Office, C, C++, Java, Artificial Intelligence, Computer Algorithms, Computer Graphics, Computer Network, Computer Communication & Networking and System Programming.

99% Job Success
$50.00 /hr
53 hours

Kusum U.

Kusum U.

Senior Test Engineer (Web, Desktop, iOS and Android)

India - Tests: 2

5+ years of experience in testing websites,desktop & mobile application: •Worked Domains name:--  Networking  Ecommerce  Education  Finance domain •Functional Testing:- Create & Execute Test Cases. Regression Testing Stress Testing Alpha & Beta Testing Database Testing •Non-Functional Testing:--  Cross Browsers Testing  Performance Testing  Usability Testing  Load & Stress Testing  Volume Testing •Document Management:- Creating Test case Test Plan Write End to End Scenarios Use Case Checklist •Other Security issues:-  SQl injection  HTML Tag or invalid data impact Authentication and Authorization •Online Bugs Tracking Tools:-  Jira  Bugzilla GitHub Mantis BaseCamp •Mobile Device Avilable:- iPhone 4 S Moto G Windows Mobile 6

100% Job Success
$10.00 /hr
0 hours

Allejo Chris Velarde

Allejo Chris Velarde

Experienced Web Developer, Php (Symfony, CI, Cake) MySQL, Javascript

Philippines - Tests: 6 - Portfolio: 6

I worked for multinational clients for more than three years as Web Developer, primarily using PHP and its major frameworks (CakePHP, Symfony, CodeIgniter), and Javascript using mainly jQuery on my previous projects. I always make sure that I could establish good communication with my client to ensure that projects are true to its goals, on budget and delivered on time.

100% Job Success
$23.00 /hr
1,602 hours

Stephen Brown

Stephen Brown

B. Sc. (Honours), Veteran Web Developer in C#.NET

Canada - Tests: 2

I have had a love for programming since a very young age. I have now been programming seriously for 12 years. I graduated Memorial University of Newfoundland in 2007 with a B. Sc.(Honours) in Computer Science. I have worked a lot recently in web development in C# but also have experience with databases and scripting. Here are a few of my skills Web Programming - C#.NET, VB.NET, WET 4, HTML, CSS, JavaScript, TFS Programming - Java, C#, VB, Python Scripting - Python

97% Job Success
$44.44 /hr
54 hours

Kristian Josef Delos reyes

Kristian Josef Delos reyes

Labview, Java, Web, Arduino, Arm Programmer, / Graphic Artist / Design

Philippines - Tests: 3 - Portfolio: 31

Graphic Artist Duration: 8 years ++ Skill Set: Print Media, Graphics, Web design/Layout Technology: Adobe Photoshop CS2-CC , Mild 3Ds Max Electronics Hobbyist and Consultant Duration: 8 years++ Skill Set: Schematic Design, PCB Design, PIC16 Programming, Arduino, Arm Programming, robotics projects, undergraduate and masteral thesis. Technology: SMS, Blutooth, Serial, Parallel, GPIB, I2C, SPI, RF, RFID, Smart Card, Arduino, ARM, Pic, C, Altium, Proteus, IAR, PicBasic, VB6, C#, SDIO, RMII Embedded Systems and Systems Integration Duration: 5 years++ Skill Set: Planning, Architecture, Design, Packaging, Programming, Debug, Implementation, Maintenance, SMU, Data Acquisition, Data Logging, Multiplexers, Realtime, Sensors, Linux basic navigation and scripting Technology: ARM, Labview, NI PXI, NI CompactRio, NI USB, Arduino, Java, C#, VB6, JSP, VB6, MySQL, MS SQL, Postgres , C, C++, PHP, FTP, TCP/IP, UDP, GPIB, Serial, Parallel, Linux Software and Web Development Duration: 2 years++ Skill Set: Planning, Architecture, Design, Packaging, Programming, Debug, Implementation, Maintenance, Technology: Labview, Java EE/SE, Visual Studio, JSP, Struts MVC, Spring MVC, PHP, Joomla, CodeIgniter, Cakewalk, Drupal. MySQL, MS SQL, Python, Mild Android, Google Graphs APIs, Javascript, HTML5, Responsive Design, CSS. My passion entails on research and development or Software Development with touches of art and elegance. Also add the love for electronics and integrating computer science and electronics to create amazing things. I am a dynamic person, and I don’t stop on what I know.. I continue pursuing towards perfection. I continue to study and study to improve myself more and more.

87% Job Success
$20.00 /hr
500 hours

Alexander L.

Alexander L.

Java J2ee Master

Ukraine - Tests: 1 - Portfolio: 2

With over 10 years of experience in IT, my goal is to build professional Java applications. Important: before sending me invitation please be sure that it is good for you to pay me according to my current hourly rate $150 per hour + 12% fee i. e. near $170 per hour. Thanks in advance for understanding. My areas of expertise include a broad range of technical experience focused on software development and data design. In the last projects I've used Java-Swing, Applets, Java Processing 2.1, MT4j, JBoss 5.1, Oracle 9-11, YUI, Javascript, HTML, CSS, JDBC, EJB 2.1 and a lot of other libraries and technologies. Also I have some experience with Python.

95% Job Success
$150.00 /hr
259 hours

Lalith Jayasinghe

Lalith Jayasinghe

JAVA | PHP |Automation | Linode | OpenShift | Heroku

Sri Lanka - Tests: 3 - Portfolio: 4

Looking for challenging desktop/web Application development(cross-platform) and Linux system administration. I am specially interested in... 1. Cross-Platform Automation. 2. Cross-Platform SEO Utility. 3. Linux server administration. 4. Cloud app development (OpenShift,Heroku,AWS,Google) I achieved sun(oracle) certification in 2005 and I have 7 years+ experience as coder.

Groups: Corona Labs

100% Job Success
$11.11 /hr
17 hours