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John R. Kosinski

John R. Kosinski

Chiang Mai, Thailand
Member since October 28, 2015
As a full-stack mobile developer, John has been developing since around 2000. Early on he did some C++, ASP, VB6, and other things but since .NET came out most of his work has been in .NET. His work experience up until 2009 was in the NYC and NYC area; since 2009, he's been living and working in Thailand. Currently, he's consulting remotely for US clients and working on iOS, Android, and IoT projects.
John is now available for hire
  • Futronix
    IoT, Alexa, AWS, ESP8266, Embedded C++, Arduino
  • Door3/FreshDirect
    Xamarin iOS, Objective-C iOS, Java Android, Xamarin Android, .NET, Selendroid...
  • Vinus
  • JavaScript, 16 years
  • Microsoft SQL Server, 16 years
  • C#, 16 years
  • Agile Software Development, 8 years
  • Scrum, 5 years
  • REST, 4 years
  • Android, 2 years
  • Xamarin, 2 years
Chiang Mai, Thailand
Preferred Environment
Depends on the type of project; I'm flexible.
The most amazing...
...project I've worked on is one that combines AR, NLP, facial recognition, and machine learning.
  • R&D Manager
    2017 - PRESENT
    • Developed Alexa Skills for Amazon Dot/Echo.
    • Worked with ESP8266 embedded programming with Arduino IDE.
    • Configured a TLSv1.1 WebSocket security.
    • Developed MQTT communication with AWS IoT cloud.
    • Created a voice-activated smarthome lighting system.
    Technologies: IoT, Alexa, AWS, ESP8266, Embedded C++, Arduino
  • Mobile Developer (Remote)
    2014 - PRESENT
    • Developed a Webby-winning eCommerce iPad application using Xamarin iOS.
    • Added new features on a legacy Objective-C app.
    • Added new features on a legacy Android app.
    • Consolidated the legacy apps into a new Xamarin unified platform.
    Technologies: Xamarin iOS, Objective-C iOS, Java Android, Xamarin Android, .NET, Selendroid, JIRA, Scrum
  • Senior Node.js Developer
    2017 - 2017
    • Developed a system of 3 Node.js applications on Heroku and several AWS lambdas over the course of a few months to implement a unique marketing "sell-it-before-implementing-it" system.
    • Developed an on-the-fly image generator using Node.js with Gifsicle and Webshot to generate customized promotional "coins" for use on the site.
    • Integrated an app tightly with AWS, using lambdas, triggers, SES, and S3 storage APIs.
    Technologies: Node.js
  • Senior Xamarin Developer
    Under NDA (via Toptal)
    2015 - 2017
    • Developed from scratch a Xamarin iOS application that controls large-scale SCADA irrigation systems via a Java middle tier.
    • Developed the MVP architecture and prepared a plan to facilitate cross-platform ports.
    • Developed a tight system of synchronizing long-running tasks with the server side, across multiple connections or app sessions.
    Technologies: Xamarin iOS, WebSockets
  • Senior Developer | Team Leader
    Manao Software
    2012 - 2014
    • Managed a team of developers to produce a REST/JSON front-end to a unique SAP-querying interface.
    • Designed the architecture for the above software using .NET Web API MVVM with NHibernate.
    • Managed a team to develop the above software in .NET.
    • Directed the QA unit-testing using SoapUI.
    Technologies: .NET, REST Services, JSON, MVVM, Knockout.js, jQuery, Soap UI, TDD, Scrum, JIRA, Perforce, DDD
  • Software Development Manager
    2009 - 2012
    • Redesigned the rate providers' pulling subsystem.
    • Developed ISAPI filters for the website.
    • Developed a prototype mobile/web app.
    • Managed the day-to-day process of development and quality control.
    • Managed a team of 16-20 developers.
    Technologies: .NET, C++, JavaScript, SQL Server, PHP, VB.NET, ISAPI, Android
  • Senior Developer
    Morgan Stanley (NYC)
    2007 - 2009
    • Performed the application and web service programming in C# and VB.NET.
    • Interfaced .NET software with legacy COBOL programs.
    • Developed GUI design/programming in ASP.NET and JavaScript.
    • Developed software to manage fixed income securities based on currency exchange models.
    • Designed service-based architecture linking .NET applications to core mainframe services.
    Technologies: .NET, C#, VB.NET, JavaScript, COBOL, SOAP Web Services
  • Senior Software Architect
    Braveline Technology (NYC)
    2003 - 2007
    • Developed an internal image server that's still in use and well-regarded.
    • Wrote an eCommerce object-oriented redesign.
    • Developed an internal component library (parts of which are still in use).
    • Serviced clients in various industries including private equity, financial services, entertainment, and accounting.
    Technologies: C#, VB.NET, C++, VB6, SOA
  • Junior Instructor
    SetFocus LLC (NYC)
    2001 - 2003
    • Researched topics to present to students.
    • Assisted the senior instructor in preparing course material.
    • Delivered and and helped to deliver course material to students.
    • Assessed and graded students' work.
    • Became MCT certified.
    Technologies: .NET, SQL Server, COM
  • Languages
    C#, JavaScript, C++, Assembly, HTML5, XML, Perl, Objective-C, Java, C, Python, COBOL, XPath, N, PHP
  • Frameworks
    ASP, .NET, Knockout.js, ASP.NET, Sencha Touch
  • Tools
    Android Studio, Visual Studio, JIRA, Xcode, Alexa, Mongoose, AWS SES, MQTT, SoapUI
  • Paradigms
    Model View Viewmodel (MVVM), REST, Agile Software Development, Scrum, Design Patterns, Model View Controller (MVC), Kanban
  • Storage
    JSON, Microsoft SQL Server, MySQL, NoSQL, MongoDB
  • Misc
    RESTful APIs, HTTP, eCommerce, Finance, Trading, SOAP, Xamarin Forms, ESP8266, Machine Learning (ML), Internet of Things (IoT), Unix Shell Scripting
  • Libraries/APIs
    Node.js, jQuery, WebSockets, Amazon API, Keras, Mixpanel API, TensorFlow, MailChimp API
  • Platforms
    Xamarin, Android, iOS, Web, Linux, Arduino
  • Bachelor of Science in Computer Science
    University of Delaware - Newark, DE, USA
    1993 - 1998
  • PFC USMC in Basic Military Skills
    Parris Island Marine Corps Recruit Depot (MCRD) - Parris Island, SC, USA
    1996 - 1996
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