API Development Professionals & Consultants

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

API Development Job Cost Overview

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

Upwork API Development Jobs Completed Quarterly

On average, 377 API Development projects are completed every quarter on Upwork.

377

Time to Complete Upwork API Development Jobs

Time needed to complete a API Development project on Upwork.

Average API Development Freelancer Feedback Score

API Development Upwork freelancers typically receive a client rating of 4.66.

4.66
Last updated: May 1, 2015
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  1. Waqas Ali

    Waqas Ali Agency Contractor

    Senior Java / JEE / SOA / Android / PHP Developer

    Pakistan - Last active: 4 months ago - Tests: 14 - Portfolio: 12

    Since 2008, I have developed a wide range of web applications using JAVA, JEE, SOA, Web Services, Spring, Hibernate, EJB3, JPA, Struts, JSF, AJAX, jQuery and WEB2.0 standards, Servlets, JSP, CSS3, HMTL5, Liferay, OpenESB, IBM BPM, Several open source libraries and APIs, Facebook and Twitter Integrations, DHTML, LAMP, and MySQL, MSSQL, CouchDB, Oracle. I have experience integrating with third party APIs and Web Services, Social Networks, LDAP, SVN libraries. I have experience in Online Payment Solution, Banking, Mortgage, Text Search, Product Data and Catalogs, POS and other portfolios.

    Groups: Application Developers Alliance

    Associated with: Softified Business Solutions

    $30.00 /hr
    961 hours
    5.00
  2. Chase Gassert

    Chase Gassert Agency Contractor

    Web Expert

    United States - Last active: 12/08/2013 - Tests: 3 - Portfolio: 3

    I'm a CEO, Sr Programmer, Network Admin, Digital Automation Expert, Entrepreneur, Internet Innovator, and Coach. Building disruptive technologies that help pave the path towards a better future is my passion. Business and technology go hand in hand nowadays, and I'm able to blend a strong mix of marketing prowess, technological know-how, and business intuition into the jobs I work on.

    Associated with: Chase Ideas Agency

    $111.11 /hr
    28 hours
    5.00
  3. Kunal C. Agency Contractor

    Expert in SMS, Twilio, Nexmo, PHP, Asp.net, Web development & design

    India - Last active: 1 day ago - Tests: 1 - Portfolio: 17

    Over 8 years of experience. Developing and providing solutions for Bulk sms website software, Text messaging software, PHP, Asp.Net, Wordpress, Android, C#, HTML, CSS, Photoshop, JQuery. Twilio, Nexmo, Trumpia wlw design, 2 way sms web apps, Internet mobile marketing, SMS to E-mail, E-mail to SMS, SMS scheduling/recurring, Keyword campaigning, Group messaging, Manage contacts, Web Designing, Volusion Ecommerce, Paypal integration, white label site design, sms gateway integration, responsive mobile websites. and Twitter, Facebook integration.

    Groups: Twilio

    Associated with: Xpertech Technologies

    $11.11 /hr
    450 hours
    4.97
  4. Arshdeep Kaur

    Arshdeep Kaur Agency Contractor

    iOS Developer

    India - Last active: 04/25/2014 - Tests: 2 - Portfolio: 1

    smartData Enterprises (I) Affiliate Proving quality innovative solutions to my clients. 3 years of extensive experience in developing Native apps for iOS apps.With great insight into User Demographic requirements and changing market needs, I am confident to take up challenges to develop the best quality apps.

    Associated with: SmartData Inc Agency

    $13.00 /hr
    63 hours
    5.00
  5. $24.44 /hr
    386 hours
    4.61
  6. Adrian Kalbarczyk

    Adrian Kalbarczyk

    Webapp prototype builder

    Poland - Last active: 09/23/2014 - Tests: 2 - Portfolio: 3

    Test your idea before spending thousands of $ on app development! I'm the author of Python and Javascript based full-stack framework that allows for building webapp prototypes in short time. Framework is battle tested and used also in big corporate projects such as collaboration software or CRM's. I helped tens of startups with validation of the idea, translating it into code and navigating the complexity of technology. #Bootstrap3 #Python #Javascript #websocket #amazon-aws

    $60.00 /hr
    0 hours
    0.00
  7. Matt Vaughn

    Matt Vaughn

    Principal Software Engineer

    United States - Last active: 12/30/2014 - Tests: 1 - Portfolio: 1

    I build amazing software...right the first time. Period. I distinguish my process by communicating proactively with my clients and understanding their needs. I deliver what is expected and there are no surprises at the end of the project. I have over 15 years of technical and business experience taking concepts to reality for a variety of industries. As a hands-on developer I deliver high-quality solutions that increase and/or create product revenue immediately using Microsoft technologies like: .NET, ASP.NET, C#, Web API, and SQL Server. I use my creativity and diverse technical skills to build application solutions and frameworks that provide the real solution. I continue to focus on quality so that the end result is an extensible, maintainbable, and performant software solution. My most recent project includes building the backend for a mobile application. The backend includes Web APIs for mobile and web applications. This allows your web UI or mobile developers to focus on usability while I provide the implementation of the entire backend of the system. This includes the API, business logic, and business rule processing - and the implementation of the backend database. I can also provide technical guidance and/or perform the configuration, deployment, and hosting of the application so that it is ready to deliver the solution.

    $52.80 /hr
    0 hours
    0.00
  8. Mike Kh

    Mike Kh

    Cheaf Technology Officer

    Canada - Last active: 03/20/2014 - Tests: 2 - Portfolio: 1

    VISIT: www.youloox.com For more details. - Programming/Languages: C# - .NET Framework v 2.0-4.5, ASP.NET v 4.5, MVC 5, HTML 5, Razor, CSS 3.0, JavaScript, Java, SQL, XML, Visual Basic, Joomla, Delphi, Cross-Platform RESTfull Web Services, Web API, WCF - Frameworks: JQuery, Google/AngularJS, KnockoutJS, TypeScript, Ajax , Telerik, KendoUI, JSON, BSON - SQL Databases: MSSQL Server 2008-2014, MS Access 97 – 2010, MySQL, SAP Sybase, Oracle, PostgreSQL - NOSQL Databases: Graph DB, Hadoop, MongoDB, Neo4j, RavenDB - Design & IDE Tools: Adobe Photoshop CS5 - CS6, Adobe Dreamweaver CS6, Unity 3D - Software: Microsoft Visual Studio 2010-2013, MS Office, SharePoint, numerous Google – Microsoft and Apple solutions - Financial Software: Oracle, SAP, QuickBooks, Simply Accounting, Microsoft Dynamics GP - Operating Systems: Linux(Ubuntu,Debian,CentOS), Windows(XP, 7-8.1), Mac OS X, Windows Server 2003-2012R2

    $33.33 /hr
    0 hours
    0.00
  9. Alessandro Usseglio Viretta, PhD

    Alessandro Usseglio Viretta, PhD Agency Contractor

    Innovation and Strategy Consultant

    Switzerland - Last active: 05/27/2014

    I'm a keen follower of technological trends and founder of Fabnami.com, presently the most advanced e-commerce website solution for 3D printing service bureaus. My core competencies lie in data processing (machine-learning, statistics and application of big-data methods), software (architecture design, algorithm development, management, agile methodologies) and 3D printing, with particular regard to the processing and visualization of 3D data. I'm a Physics graduate with a PhD in Computational Neuroscience from the ETH - Swiss Institute of Technology in Zurich, rated as the best institution in continental Europe.

    Associated with: In Numero LLC Agency

    $90.00 /hr
    0 hours
    0.00
  10. Joshua Estes

    Joshua Estes Agency Contractor

    Developer, Consultant, Entrepreneur

    United States - Last active: 4 months ago - Tests: 4 - Portfolio: 1

    Highly talented and skilled software professional willing to work as a developer where I will get an opportunity to utilize all my knowledge and other skills to benefit your organization as well as grow to become a stronger developer.

    Associated with: dSpace Labs LLC

    $35.00 /hr
    0 hours
    0.00