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, 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
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  1. Stephen Brown

    Stephen Brown

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

    Canada - Last active: 13 days ago - 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

    $44.44 /hr
    54 hours
    5.00
  2. Robert Kluver

    Robert Kluver

    Lifetime Internet Guru

    United States - Last active: 1 day ago - Portfolio: 5

    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
  3. Ravi shankar S.

    Ravi shankar S. Agency Contractor

    1st Rank, Salesfroce Certified Developers with 7+ yrs experience

    India - Last active: 2 days ago - Tests: 3 - Portfolio: 1

    Over the last 7+ years, I have developed a wide range of applications on force.com platform. During this period I worked with each and every component of the Salesforce. I have provided exceptional quality work to customers. Here is a list of some of the work done by me and these apps are rated as very good on AppExchange: http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003J6KcEAK http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003IleFEAS http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003J4NhEAK http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003J4NhEAK http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003J4NmEAK http://appexchange.salesforce.com/listingDetail?listingId=a0N300000030ptZEAQ http://appexchange.salesforce.com/listingDetail?listingId=a0N30000001tc1DEAQ http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003Ilf6EAC http://appexchange.salesforce.com/listingDetail?listingId=a0N30000003J2fBEAS I am also having awesome experience on Data Migration, Integration, Web-services, Migration tools etc.

    Groups: salesforce.com

    Associated with: Simplyforce Technology Agency

    $40.00 /hr
    14,833 hours
    4.99
  4. Dhaval S.

    Dhaval S. Agency Contractor

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

    India - Last active: 1 month 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
  5. Collin M.

    Collin M. Agency Contractor

    Senior Full Stack Developer (Mobile, Web, Script/ Utilities)

    United States - Last active: 14 days ago - Tests: 4 - Portfolio: 15

    I have 10 years of experience in both web and mobile software development as well as script and utility programming. My current main area of interests is within Data Science including data mining/scraping. I have several years of experience in writing screen scrapers for online data sources (scraping in total more than 500 sites). I will be happy to craft a state of the art product for you using the following techs: Bootstrap, AngularJS, BeautifulSoup, Scrapy. I am familiar with many others, but these are my favorite. WEB BACKGROUND I have wide knowledge of many modern technologies in web development stack -- from low-level networking protocols and system tweaking (debian, nginx) to server-side programming (PHP, Node.js, MySQL, MongoDB, Redis) to client-side programming (HTML5 APIs, Javascript, AngularJS). I could solve the programming task of any complexity for you. I prefer developing complex and unique web services and/or user interfaces rather than creating simple websites which are similar to each other. MOBILE BACKGROUND I am the Owner and CEO of a digital development firm, ebork Developments, LLC, which specializes in the development of mobile applications across all platforms (see below). Strong .NET, Java, Objective-C, and Swift programming skills including low-level performance optimizations and memory management. I not only know how to make an application work, but also know how to make it work fast and smoothly. Good knowledge of Android, iOS, and Windows UI patterns and guidelines. I can prototype any application UI for you. SCRIPT/ UTILITY BACKGROUND I have been writing data scrapers and other data intensive scripts/ utilities for many years. My language of choice for many of these is Python. However, I can successfully develop a utility in many scripting languages, including: PHP, Ruby, Perl, etc. I have written screen scrapers for over 500 websites, including Google Search and Craigslist. I have a very high working knowledge of HTML, which helps me quickly write any screen scraper you find yourself needing.

    Associated with: ebork Developments, LLC

    $44.26 /hr
    231 hours
    4.78
  6. Hoat Le

    Hoat Le Agency Contractor

    Full-Stack Developer

    Vietnam - Last active: 10 hours ago - Tests: 14 - Portfolio: 2

    • I'm a talented Web and JavaScript developer. I've got extensive experience working with Java, JavaScript and Python. I'm also co-founder, team leader at Teracy where we do outsourcing and product development. • I'm expert in the following fields: JavaScript, Python, MySQL, PostgreSQL, Java, HTML5, CSS3, OOP, AJAX, XML, Design Patterns, software architecture, jQuery... • I'm looking for opportunity to use my working experience to build robust websites from ground up for your business.

    Associated with: Teracy, Kombai Team

    $33.33 /hr
    2,572 hours
    4.88
  7. Vo K.

    Vo K. Agency Contractor

    Senior EMR Java PHP C# Engineers

    Vietnam - Last active: 8 days ago - Tests: 3 - Portfolio: 5

    - Experience in application & web development experience in consulting, design, developing and maintenance on application software development including sales automation projects. - Good R&D, Specialist Electronic Medical Record and successfully to pass 2 International Certifications for US client: (E-Prescribing and ONC certification). Specialist in Agile Software Development by using OOP, Java, Ruby on Rails, TDD, SCRUM, XP, UML, Design Patterns - Work under pressure, make decision, solve problem quickly - Good work on Java J2EE, Spring, Struts, Play, JSF, JAVAFX, Vaadin, Tapestry,Wicket, FLEX, Spring, Struts, Hibernate Frameworks) - Experience working on C# WPF, WCF, METRO WIN 8, Silverlight,... - Experience on PHP: Yii, Codeigniter, Zend FW, CakePHP. Laravel. - Application Developer, Database Administrator. Particularly interested in client/server, WebService, Remote and relational database design using Oracle, NOSQL, MYSQL, and MS-SQL Server 2000, 2005. Javascripts: Jquery, Mootool, EXTJS, XML JSON,.. - OS: Linux, Centos, Fedora, Ubuntu, Windows, ... - Experience using GIT, VSS, SUBVERSION, GITLAB, GITHUB, - Specialist on Agile Methodology: SCRUM, XP using Mingle, Pivotal Tracker - Project: 1. RealEstate (www.diaoc24g.com) BY C#, ASP.NET 2. Ecommerce Travel Photos site (http://www.josephhendrixphotography.com) by C#, asp.net 3. PTS project ( PROTOTYPE TRACKING SYSTEM) for Chartered Semiconductor Manufacturing(J2EE, Spring, Struts, Hibernate). 4. 3 years worked for HEALTH CARE software:(Get Prescription' Certification of Surescripts(NEWRX, RXHUB, REFREQ, REFRES...) - Android for Health Care that help doctor check the patient from mobile Phone and synchronize data between Mobile Phone and Server Site. This function will help the doctor is easier to check inpatient, history visit, CPT, DX, ... - Worked HEALTH CARE SOFTWARE project, SuperEMR is a proven, affordable, and comprehensive electronic medical record system designed for small practices. Patient information including past medical and social history, encounters, diagnosis, medication, laboratory results, hospital reports, and medical imaging dicom results can all be stored electronically in secure databases. The system is web-based, allowing simple yet secure access to the patient information from anywhere and anytime. Daily remote backup in available for free for protection against system failures or natural disaster Development on this project (superemr.biz, superemr.com,superemrusa.net) Responsible for working with the client on implementation, fix bug, maintenance, managing project resources I did good job AND got the SURESCRIPTS AND RXHUB INTERNATIONAL CERTIFICATION for HEALTHCARE SOFTWARE (superemr.com). Work on DICOM open source project that used JAVA SWING to help the doctor can view XRAY, DICOM images, Web Application development. Database: MYSQL Client: US, Language: JAVA, WEBSERVICE, JNLP, PHP, webservice on UBUNTU, FEDORA

    Associated with: agileitvn

    $33.33 /hr
    1,273 hours
    5.00
  8. Mikhail P.

    Mikhail P. Agency Contractor

    Experienced Python/C++/Oracle Team Lead

    Russia - Last active: 11 days ago - Tests: 5 - Portfolio: 6

    Over the last 10 years I have developed wide range of business software using Python C++, Java, C# for frontend and Oracle and MySQL for backend. My primary experience is the problems solving, not just writing in particular programming language. Fast prototype developing for new systems and extending the functionality and refactoring for the old one.I'd like to use automated software testing, because it's increases my productivity and software quality. Check my code on github - https://github.com/kmmbvnr I'm author of several django related libraries for simplifying development and testing.

    Associated with: FairDev

    $45.00 /hr
    1,077 hours
    5.00
  9. Stas Davydov

    Stas Davydov Agency Contractor

    [PRO] Web development PHP, JavaScript, HTML, CSS, Java, Python, SQL

    Russia - Last active: 13 days ago - Tests: 16 - Portfolio: 19

    I know how to develop software with good quality in short time. The best project lifecycle under my development is: 1) Fast prototyping from UX scenarios and wire-frames. 2) Implementing functional and unit-tests for front-end and back-end. 3) Development phase with continuous integration and fast iterations. 4) Production. I specialized on web sites and web applications with complex structure and back end. Also I'm familiar with usability and like to develop clean and light user interfaces. For web development I usualy use PHP or Python + Ajax (jQuery). This's the simplest and fastest solution for most web applications. I've big experience in development of very different applications from small innovative web 2.0 services to complex client/server applications (like SirsiDynix Horizon - an application for library workflow management). My another expertise is Java, I use it since 2000 for numerous projects. I always pay the most attention to customer needs. And I can study faster when need to work with framework/technology I never worked before. Please, visit my portfolio website for more information about me: http://stasdavydov.com/ Thanks!

    Groups: Application Developers Alliance

    Associated with: Outcorp

    $38.89 /hr
    847 hours
    4.78
  10. Salim R.

    Salim R. Agency Contractor

    Software Engineer with J2EE and APIs experience

    Lebanon - Last active: 1 month ago - Tests: 4 - Portfolio: 9

    Passionate in Web development and business analysis, 5+ in software development and QA, I have been working with multiple teams where I have developed Web based applications using J2EE/PHP. My Portfolio: http://bit.ly/1iIPB7S Projects I have been working on: - SIP/VOIP Java desktop application that monitors other contacts status - ISAE-Cnam Liban educational Information System (present) - Compressus MedXConnect medical system, worked on the core engine My skills cover the following: 1- Full life cycle software development process, covering analysis, design, testing (White/black box, unit and complete test) and validation. 2- Patching, Junit3/4 3- Writing Business Requirement, technical documentation 4- Tools: Eclipse, NetBeans, Webmin, PhpMyAdmin, GIT, CVS,etc. Maven: Building, testing, packaging, installing 5- Strong Knowledge in project management: Scrum, estimations, conference calls,etc. Online tools: BaseCamp, Jira, Pivot Tracker

    Associated with: Super Tech

    $38.00 /hr
    299 hours
    4.97