About Me

Hello, I am Brian Hassel, a software developer from the Philadelphia suburbs. I primarily develop on the Microsoft stack (.NET, IIS, SQL Server), and I love working on hard problems and designing systems.

I can be reached at: {first name}.{last name}@{Google Mail}

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Senior Software Architect/Developer - ExpenseWatch (January 2015 - Present)

Senior architect and developer for ExpenseWatch, a web-based (SaaS), multi-tenant spend management suite. The product handles thousands of transactions and users daily.

  • Re-architected a monolithic ASP.NET web application to queue-based microservices to improve reliability, performance, and maintainability.

  • Automated the build, test, and deployment process of all ASP.NET websites, supporting Windows services, iOS/Android apps, and database migrations using TeamCity and Octopus Deploy.

  • Redesigned areas of the UI using MVC, jQuery, Knockout.js, and Bootstrap.

  • Performed a full code security audit and implemented improvements including: PBKDF2-based password hashing, one-time passwords, and authenticated encryption (HMACSHA256/AES256) for sensitive personal and financial data.

  • Designed and developed a REST-based API for transaction objects using WebAPI and ASP.NET Identity.

  • Implemented an integration to QuickBooks Online, including OAuth management, for syncing transaction data.

  • Developed .NET data storage libraries and conversion utilities to move 4 TB of user-uploaded binaries to Azure blob storage.

  • Implemented an automated OCR process for receipts uploaded to the system. The OCR process uses queues, webhooks, and a plugin system that allows multiple OCR providers.

  • Built a new, queue-based reporting service that addressed timeout issues with running large reports in the web application.

  • Full cleanup and modernization of 600+ KLOC code base, including moving from .NET 4.0 to 4.6, updating packages, and fixing all compiler warnings.

  • Implemented automated unit and integration tests. Prior to my arrival, there were no unit tests for the code base. All new modules have 80% code coverage, and tests have been added for legacy code.

Senior Developer - AcademyOne, Inc. (December 2013 - January 2015)

Senior developer on nine-member team designing and developing software for higher education. Focus on web-based solutions that adhere to HTML5 standards, accessibility guidelines, and mobile-friendly layout.

  • Implemented key features in Florida Virtual Campus, a student portal to view course offerings, using: ASP.NET MVC5, Entity Framework 6.1, AngularJS, jQuery, and Bootstrap.

  • Served as Tech Lead and primary architect for College Credit Fast Track, a prior learning assessment system, using: ASP.NET MVC5, Entity Framework 6.1, AngularJS, and jQuery. Employed a state-machine design to increase flexibility and reliability.

  • Designed and developed a distributed, message queue-based solution to replace a student admissions system using: JAVA 1.8, Spring MVC, Hibernate, Jersey/Grizzly, Guice, and Maven.

  • Developed software using an Agile-methodology and participated in planning and sprint retrospective discussions.

  • Presented key architectural design research and new-technology walkthroughs to other developers at Lunch-and-Learn events.

Chief Software Architect - 4DIQ (May 2011 - December 2013)

Chief software architect for a startup that implemented a .NET data integration and business analytics software package. Assisted in all areas of the business including acquiring new customers and forming partnerships with related firms.

  • Designed an in-memory data model that was used to support data sets over 10GB in size.

  • Developed an ASP.NET MVC 4 web portal application solving challenges with concurrency, authentication, user privileges, and high availability.

  • Developed a WCF service that supported 40 requests a second from distributed client applications.

  • Implemented a JavaScript-based charting library to provide configurable dashboards and reports.

  • Developed integration interfaces to common social media platforms and CRM systems (e.g. Salesforce, Twitter, Facebook, and LinkedIn.)

Senior Software Architect/Developer - Sungard (December 2007 - April 2011)

Led a 5-person team that implemented a .NET portfolio management and trading system. Mentored junior team members and interns.

  • Designed and served as lead developer on an initiative to develop an international portfolio management system that was multi-currency and localization-aware

  • Designed and implemented specific software enhancements that resulted in the acquisition of 4 high-profile US financial institutions.

  • Implemented a FIX 4.4-based trading platform capable of handling thousands of transactions daily.

  • Gave several presentations during the annual user conference to demonstrate the software.

Senior Software Engineer - Financial Technology Integrators (May 2001 - December 2007)

Member of a 4-person team that implemented a .NET portfolio management and trading system used by 2000+ users managing over 100,000 accounts. Acquired by SunGard in 2007.

  • Led design & development of a 160+ page ASP.NET web application.

  • Designed and implemented a FIX 4.0/4.2/4.4-based order routing network with connections to 20+ broker-dealers that routed tens of thousands of transactions daily.


BSc. Computer Science - University of Delaware (1998 - 2002)

  • Dean’s List (3.6 Major GPA)
  • Concentration in Computer Network Engineering
  • Independent Research/Thesis: Multimedia compression algorithms (MPEG-2/MP3) and media software design.

Frequent attendee of Philly.NET meetings and Code Camps. Attended 4 years of the Visual Studio Live! conference.