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, 341 API Development projects are completed every quarter on Upwork.

341

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: June 1, 2015
More options
Clear all filters
  1. Niels Ganser

    Niels Ganser

    German Engineered Ruby on Rails Solutions & Reliable Project Managment

    Germany - Last active: 1 day ago - Tests: 7 - Portfolio: 3

    Hi, I'm Niels, a seasoned software engineer based in Germany mostly working on web applications of all kinds using Ruby on Rails (3 and 4), (My)SQL, mongodb, redis, HTML(5), CSS and JavaScript in an agile manner. I also set up and maintain Linux servers. Several applications that I architected, implemented and maintain are in active production use. Please see my portfolio for details. I have years of experience as a senior developer – working solo, in co-located teams as well as in distributed teams – and hold a postgraduate diploma in Management of Software Projects. My greatest prides are proactiveness, reliability and good communication Please note that I do *not* do graphic design. Not for a lack of interest, but for an unfortunate lack of artistic talent. Sorry! :)

    Groups: Engine Yard Ruby on Rails Professionals Network

    $128.50 /hr
    5,371 hours
    4.97
  2. Alexander Kozlov

    Alexander Kozlov

    Top level professional Architect and SW engineer

    Russia - Last active: 1 month ago - Tests: 21 - Portfolio: 5

    Make things done! I'm a professional C/C++ developer with more than 12 years of experience. I have been working both for a companies from Fortune 500 list, and a small local companies. My core competency lies in the world of mobile applications, SaaS and PaaS, desktop software and games development. I love to do my work right and really enjoy being respected for the things i do.

    $55.56 /hr
    1,772 hours
    5.00
  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. Alexander Miloradov

    Alexander Miloradov

    ASP.NET and C# Senior developer / Architect

    Russia - Last active: 1 day ago - Tests: 11 - Portfolio: 13

    ● More than 10 years of experience on the .NET stack. ASP.NET MVC sites (frontend and backend), desktop applications, any tasks using the best ways to solve. ● Use the best practices for building a correct and extensible architecture and high-quality code. Patterns, unit testing, any source control systems, team working. ● Always in touch, reliable, self-motivated and goal oriented. Provide steady work progress with maximum productivity of each hour of work.

    $44.44 /hr
    3,605 hours
    4.77
  5. Oleg Batishchev

    Oleg Batishchev

    Magento Jedi / Senior Web Developer / Consultant

    Russia - Last active: 1 day ago - Tests: 6 - Portfolio: 9

    Hello dear customer, Yes, I'm not wrong, cause after read that you will wanna to hire me ;) Well, now seriously ... I am a highly experienced web developer who has primary direction of activities in e-Commerce web-developing, in that case it's a Magento area. I'am an adept of Magento and if you don't know what is it and you wanna e-commerce site you have to contact with and I will explain how is Magento awesome. I have 3 years experience in Magento and 9 years total in PHP developing with an MVC, different CMS (Wordpress), frameworks (Yii, Zend) and other. I always stick to the coding standards and follow the best practices to provide seamless, readable and reliable code. Besides developing I have some administration skills to manage servers, automate routines and can improve performance of Magento backend and frontend as well. Also I can setup the server from a scratch. I prefer a stack for Magento consists of: Nginx, Php-Fpm, Redis, Apc, Mysql 5.5 (5.6) (Percona better), SOLR/Lucene/Sphinx. I prefer do not install any control panels but if required I would prefer ISP Manager 5 Lite. Magento related Experience and Services - Optimization, load improvements, speed up - Extension development and customization - Troubleshooting - Tweaks & tricks - Bulk importing. Do you have 100k products? It's not a problem - Store migration - AWS, Rackspace building an architecture of you infrastructure - Core upgrade - Magento recurring support - Bug/error fixing - Theme design and customization - Consultation - Code review I also have some basic skills in the desktop programming (C#) and some Photoshop skills. I'll be glad to new acquaintances and long-term cooperation. I have a team of developers and every day we are expanding. Just hard to write all things what I can do. I am easy learnable for new stuff (frameworks, custom systems, foreign code). My strong side is a backend developing and have a good knowledge of a frontend side: - HTML5/CSS3 - Bootstrap - jQuery - Ajax - WebSockets, Long polling - Prototype - ExtJS - Google API, Yandex API - many other things that I can't remember at this moment. Also in a less degree Angular, Backbone and other frameworks/libs. Communication Channel : Skype/Whatsapp/Email/Phone I have listed only a little part of my portfolio cause I have many jobs completed and I can't add every job to profile.

    $45.00 /hr
    1,164 hours
    4.98
  6. Sergey M.

    Sergey M.

    Software Engineer | Master's Degree in Computer Science (MSCS)

    Belarus - Last active: 3 days ago - Tests: 9 - Portfolio: 4

    Highly skilled Software Engineer with 5+ years of experience in developing application for customers from different parts of the world. I am an expert in API implementation. And I am familiar with wide range of technologies mainly focused on .Net C# desktop and Web applications. My strong analytical skills combining with real practical experience allow me to provide you perfect solutions in reasonable period of time.

    Groups: Application Developers Alliance, ebay...

    $33.33 /hr
    808 hours
    4.97
  7. Orest K.

    Orest K.

    Senior System Architect

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

    I am a highly skilled senior developer with extensive development experience in system design, .NET technology stack including C#, ASP.NET, MVC, Web Api, SQL, Entity Framework. In addition I'm passionate about JavaScript and related technologies, namely AngularJS, Knockout, NodeJS, Express etc. I have Computer Science degree from one of the top Engineering school in US Few of my latest project listed below. Architected and implemented service oriented framework built on a variety of technologies including .NET, MVC , HTML5, ASP.NET Web API, Entity Framework,AngularJS, KnockoutJS, RabbitMQ, RequireJS and others. Designed and implemented Enterprise Single Page Application standards and led a team to successful project implementation using SPA. I have Computer Science degree from one of the top Engineering school in US. Please see my test score for my qualifications.

    $55.00 /hr
    141 hours
    5.00
  8. Olivier Tisserand

    Olivier Tisserand

    Senior Software Architect

    Spain - Last active: 8 days ago - Tests: 1 - Portfolio: 1

    French Senior Software Engineer with a career structured in several axis : - DevOps technologies (Vagrant, Chef, Amazon AWS, VirtualBox, Jira, Confluence, Crucible, svn) - Testing Automation (Hudson, Jenkins, Cloudburst, JUnit, JBehave, Cppunit) - Senior Software architect : Java, C#, C++, Ruby, RoR, Python, Oracle, SQL Server, MySQL. - Data mining solutions linked with SQL databases.. - Data acquisition systems and monitoring, Building Intelligence, Protocol handlers. - Statistics and Numerical analysis (R language, Eviews, Matlab, Scilab) - Artificial Intelligence and specific languages, with industrial applications. - PPC Statistics & API (Adwords, Adcenter) - Networking with a Wireless Internet Provider (Mikrotik specialist). - Business Intelligence With 25 years experience in France and Spain as Consultant Engineer in various business environment, able to handle and develop projects involving multiple environments and technologies.

    $33.33 /hr
    3,025 hours
    5.00
  9. Andrew B.

    Andrew B.

    Fullstack web developer

    Moldova - Last active: 13 days ago - Tests: 4 - Portfolio: 2

    I specialize in development of web-applications with various difficulty levels: from simple single-page applications to large scalable projects with public API and high-load. I prefer to use popular frameworks, native code. 1. About Me I started my professional way 10 years ago, having obtained C++ for Windows certificate. Fundamentals from strict C++ language helps me to learn new languages. I have good skills in Python, Lua and Bash for Linux and MacOS, C/C++ for Windows and Linux. I work with full-stack of technologies in web-domain: server-side setup, backend and frontend-development. Always document code with PHPDoc, leave detailed comments. Ready to use Git/Github, Mercurial, different error tracking systems. Last 3 years I supported projects in aviation, trade and copyright protection domain. Theretofore I managed a small web-studio, and that is why I have ideas about responsibility and of meeting deadlines from customer's standpoint. I have wide experience in project planning and never start working before all details and nuances are clearly specified. 2. Server-side and administration I use RedHat, CentOS, Ubuntu and Debian for a long time as OS for my servers. I know how to tune server to reach best practice in reliability, speed and security. Nginx and Apache web servers; caching; balancing; database replication; backups; creating access control policies; cPanel or Webmin software; creating FTP/SFTP file storages; personal mail and Jabber-servers; mail delivery systems; firewall and DDoS protection. 3. Backend I use PHP for backend-development and I know how to use development patterns, strong knowledges in OOP, inclusive PSR standards. I use Laravel, CakePHP, Symfony and CodeIgniter frameworks. At this moment I prefer Laravel framework for new projects, but it never was a problem to use any other framework: I have wide experience in code review and refactoring, even old-style functional or all bad-practices-inclusive code. I am perfect in relational DBMS. I have 6-year experience in MySQL and sure when to use MyISAM or InnoDB; indexes; correct queries; organize full-text search with/without Sphinx. Used PostgreSQL, MSSQL, Oracle and some exotic data sources. NoSQL-solutions like Couchbase, Redis, MongoDB or Memcached are also familiar to me. I have experience in using many public APIs: Facebook, Twitter, Google Maps, GData, Youtube, LeafletJS, OpenStreetmap, Mailgun, Mailchimp and lot of others. I know how to build public API using REST, SOAP, JSONP or any other custom XML-protocoll or low-level sockets. 4. Frontend HTML5, CSS3 and JavaScript. Prefer to use frameworks: Twitter Bootstrap, Animate.css, jQuery, AngularJS, require.js, underscore.js and lot of others for different purposes: caching, speed-up, web sockets, HTML5 API, Chrome applications and s.o. I like to develop user interfaces, widgets or any other useful and elegant UI-elements. My favorite pattern today is Single Page Application. I’m glad to share my knowledges and experience, and, of course, to apply them in your project.

    $33.33 /hr
    124 hours
    5.00
  10. Dejan Noveski

    Dejan Noveski

    Software engineer

    Macedonia - Last active: 16 days ago - Tests: 3 - Portfolio: 1

    I’m a passionate software engineer of 6 years, with knowledge and experience in prototyping, developing and deploying web applications, web services and platforms powered by the popular Python frameworks - Django, Flask, or PHP and PHP frameworks. I also have considerable experience - Building standalone desktop applications, utilities, system and automation tools. - Building mobile web services with offline support, syncing and data packaging to preserve bandwidth efficiency. - Implementing enterprise-level search and matching engines with Apache Lucene / Solr. - System administration and bash scripting. I work very quickly and go to considerable lengths to ensure that every job I undertake is delivered to my clients’ complete satisfaction. I’m constantly learning, and I’m always interested in taking on new challenges. Whatever your software needs are, I’m confident I can help you. References available. Specialties: Python, Django, Flask, Werkzeug, Pylons, SQLAlchemy, HTML, HTML5, CSS, CSS3, JavaScript, PHP, Solr, Lucene, Apache, Nginx, PostgreSQL, MySQL, Linux/FreeBSD administration, Web services, GIS, Geocoding, Vim, VimL, Git, Mercurial.

    $33.33 /hr
    1 hours
    5.00