James Hollister, Software Developer in Seattle, WA, United States
James Hollister

Software Developer in Seattle, WA, United States

Member since September 26, 2016
James has 15 years of experience analyzing complex business problems and solving them with simple, elegant information systems. Technologies that he has used to build those systems consist primarily of the Microsoft Stack: Azure, C#, ASP.NET, SQL Server, WPF, and JavaScript. Recently, James has become active in areas related to the Azure Cloud.
James is now available for hire




Seattle, WA, United States



Preferred Environment

Azure, TFS, Visual Studio, Windows

The most amazing...

...project I've worked on was a decentralized cryptocurrency trading platform running on the NEO network.


  • Senior Software Engineer

    2020 - 2022
    • Developed features for Microsoft Teams that allowed third-party extension developers to charge for subscriptions to their apps.
    • Integrated and collaborated with sister teams on a feature roadmap.
    • Supported ongoing feature development and production systems.
    Technologies: C#, Angular, Azure
  • Freelance Blockchain Developer, NEO

    2018 - 2018
    Aphelion Exchange (via Toptal)
    • Worked as a full-stack developer, as part of a small team which built a decentralized cryptocurrency exchange platform.
    • Designed and developed a NEO smart contract.
    • Designed and built a server application which monitored the NEO blockchain.
    • Designed and developed a Vue.js, Electron cross-platform desktop cryptocurrency wallet and trading interface.
    • Designed and developed a .NET Core API which matched orders and provided order book information to clients.
    Technologies: JavaScript, Blockchain, NEO, Smart Contracts, C#
  • Freelance WPF Developer

    2017 - 2018
    MVI Systems (via Toptal)
    • Developed touchscreen windows based on a kiosk application in WPF.
    • Built real-time communication protocol for data transfers from the client to the server.
    • Constructed a SIP integration to initiate phone calls with clients.
    Technologies: XAML, C#, Windows Presentation Foundation (WPF)
  • Freelance WPF Developer

    2016 - 2017
    Interstates (via Toptal)
    • Ported a legacy VB 6 application to WPF.
    • Assisted with an SQL query performance optimization.
    Technologies: Microsoft SQL Server, XAML, C#, Windows Presentation Foundation (WPF)
  • .NET Developer

    2008 - 2010
    Tech Results
    • Developed and maintained web based applications for the casino gaming industry.
    • Implemented SQL Server performance tuning.
    • Traveled to client sites for installations and requirements gathering.
    • Worked on SQL Server reporting services and SQL Server integration services.
    Technologies: Microsoft SQL Server, ASP.NET, C#
  • Co-owner | Principal Consultant

    2006 - 2008
    Ascending Integration
    • Consulted with clients to discover opportunities for software to improve their business.
    • Developed and managed client relationships.
    • Designed and scoped custom software development projects.
    • Developed software using ASP.NET, Windows Forms, WPF, and Silverlight.
    Technologies: JavaScript, Microsoft SQL Server, C#, Windows Forms, ASP.NET
  • ASP.NET Developer

    2005 - 2006
    Advanced Information Systems
    • Managed relationships with clients.
    • Built and supported web based applications.
    • Developed with ASP.NET Web Forms and JavaScript.
    • Implemented SQL Server data access and performance tuning.
    Technologies: Microsoft SQL Server, JavaScript, ASP.NET Web Forms
  • ASP.NET Developer

    2003 - 2005
    • Supported and developed web-based applications for the hospitality industry.
    • Implemented SQL Server access via T-SQL and ADO.NET.
    • Tuned the SQL Server performance in order to improve the application speed.
    • Led the development on a web-based video case management system.
    • Supported a legacy Classic ASP application.
    Technologies: C, Microsoft SQL Server, JavaScript, ASP.NET Web Forms


  • MVI Systems

    I developed a Windows-based touchscreen application for a building entry system.

  • Aphelion

    I developed a smart contract, server, and client wallet for a decentralized cryptocurrency exchange platform on the NEO blockchain.

  • Azure Service Fabric Application

    Helped scale and stabilize a complex Service Fabric application. Built custom tooling to conduct load tests and verified throughput of 150,000 transactions per minute.


  • Languages

    SQL, C#, JavaScript, T-SQL, Go, C, XAML, Java, PHP
  • Frameworks

    Windows Presentation Foundation (WPF), ASP.NET MVC, ASP.NET, AngularJS, ASP.NET Web Forms, Blazor, Angular
  • Tools

    Microsoft Visual Studio, Visual Studio, TFS
  • Paradigms

    Agile Software Development, Agile
  • Platforms

    Azure, Azure Service Fabric, Blockchain, Windows, Xamarin
  • Storage

    Microsoft SQL Server, MySQL, Azure Websites, Azure Blobs, Azure Tables, SQL Server Integration Services (SSIS)
  • Libraries/APIs

    Node.js, jQuery, Vue, Windows Forms
  • Industry Expertise

    Trading Systems
  • Other

    Smart Contracts, CTO, Fintech, Cryptocurrency, Performance Testing, NEO


  • Bachelor's Degree in Management Information Systems
    2003 - 2008
    University of Nevada, Las Vegas - Las Vegas, NV (USA)

To view more profiles

Join Toptal
Share it with others