Freelance Blockchain Developer, NEO
2018 - 2018Aphelion 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: C#, Smart Contracts, NEO, Blockchain, JavaScriptFreelance WPF Developer
2017 - 2018MVI 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: WPF, C#, XAMLFreelance WPF Developer
2016 - 2017Interstates (via Toptal)- Ported a legacy VB 6 application to WPF.
- Assisted with an SQL query performance optimization.
Technologies: WPF, C#, XAML, SQL Server.NET Developer
2008 - 2010Tech 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: C#, ASP.NET, SQL ServerCo-owner | Principal Consultant
2006 - 2008Ascending 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: ASP.NET, Windows Forms, C#, SQL Server, JavaScriptASP.NET Developer
2005 - 2006Advanced 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: ASP.NET Web Forms, JavaScript, SQL ServerASP.NET Developer
2003 - 2005SmartConnect- 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: ASP.NET Web Forms, JavaScript, C3, SQL Server
James Hollister
Windows Presentation Foundation (WPF) Developer in Seattle, WA, United States
Member since July 21, 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: ASP.NET, C#, SQL Server, WPF, Windows Services, HTML5, and JavaScript. Most recently, James has become active in areas related to blockchain development with smart contracts on NEO and EOS platforms and the Azure cloud.
James is now available for hire
Portfolio
- Aphelion Exchange (via Toptal)C#, Smart Contracts, NEO, Blockchain, JavaScript
- MVI Systems (via Toptal)WPF, C#, XAML
- Interstates (via Toptal)WPF, C#, XAML, SQL Server
Experience
- C#, 14 years
- ASP.NET, 13 years
- SQL, 12 years
- Microsoft SQL Server, 12 years
- JavaScript, 8 years
- Windows Presentation Foundation (WPF), 5 years
- Smart Contracts, 1 year
- Blockchain, 1 year
Availability
Part-time
Preferred Environment
Windows, Visual Studio, TFS, Azure
The most amazing...
...thing I've made was a decentralized cryptocurrency trading platform running on the NEO network.
Employment
Experience
- MVI Systems (Development)https://www.mvisystems.com/
I developed a Windows-based touchscreen application for a building entry system.
- Aphelion (Development)
I developed a smart contract, server and client wallet for a decentralized cryptocurrency exchange platform on the NEO blockchain.
Skills
Languages
SQL, C#, JavaScript, T-SQL, Java, PHPFrameworks
ASP.NET MVC, ASP.NET, Silverlight, AngularJSTools
Microsoft Visual StudioParadigms
Agile Software Development, Model View Presenter (MVP), AgilePlatforms
Xamarin, Blockchain, Azure, Windows, WordPressStorage
Microsoft SQL Server, Azure Websites, Azure Blobs, Azure Tables, SQL Server Integration Services (SSIS)Other
Windows Presentation Foundation (WPF), Smart Contracts, Trading Systems, Cryptocurrency, Financial Technology, CTO, Fintech, Bitcoin, Performance TestingLibraries/APIs
Node.js, jQuery, Vue.js, Facebook API, Stripe API, React
Education
- Bachelor's degree in Management Information Systems2003 - 2008University of Nevada, Las Vegas - Las Vegas, NV (USA)
Certifications
- Microsoft Certified Professional DeveloperOCTOBER 2006 - PRESENTMicrosoft
