Client: Booz Allen HamiltonProject: National Clozapine Coordination Center

Halfaker: MCCF ePayments (2/2019 - Present)Maintain and improve VistA’s ePayments system in the Accounts Receivable package. Modified server logic to receive and collate partial payment records for a day rather than only one record per payment per day, and added ability to receive/process negative (debit) payments. Added new email message functionality to server error reporting to assist the identification and correction of trans mission errors. Improved Site Parameter Settings option by grouping parameters into categories and giving user the option to select which categories they wish to see.AbleVets: VistA Scheduling Enhancements (04/2018 - 09/2018)Worked with a team to maintain and extend the VistA Scheduling C# .NET application. Created and modified WPF windows and controls plus supporting background logic using the MVVM design pattern to enable VSE to interact with the VA Online Scheduling (VAOS) web service. Made changes to the MUMPS/VistA code to ensure VAOS appointment request records are imported correctly into VistA.Microsoft: TeleHealth (09/2017 - 04/2020)Part-time. Help integrate client's scheduling software into VistA via Intersystems HealthShare.Mantech: Native Domain Standardization (NDS) (11/2017 - 02/2018)Primary developer for a patch to the VistA Laboratory package to support terminology standardization in the Lab Enhancements domain, support longer usernames and add new indexes for lookup.AgileX/ASM Research: eHMP (06/2015 - 08/2017)Helped develop VistA/M code to serialize VistA data in a JSON format and sync patient data with the VistA Exchange server. Helped maintain and expand in the Cache/M JSON Data Store for VistA Exchange, a federated cache of health data featuring filters, indexing, and templates accessible through a REST interface. Modified chef system configuration scripts to make test VistA systems more closely simulate real-world conditions. Helped maintain and improve Javascript Node.js code for synchronization server.

Worked with a team to maintain and enhance a chemotherapy management product, written in C# and VB .NET, which interfaces with the VA's VistA system's remote procedure calls (RPCs) to MUMPS routines and connects to a Microsoft SQL Server database for storage. Worked on both the C#/VB and the MUMPS code to help resolve complex issues within the bounds of specific constraints and add new features to the product.Helped to create new business opportunities by working with a team to create the VistA/MUMPS backend for new software.Worked on VA contracts, directly modifying VistA.

Primarily worked for a single client, Overby-Seawell Company (OSC). Helped to maintain OSC's insurance tracking system, written in C++, by developing code to find relevant data in their clients' data files and reformat it to fit OSC's schema.

MUMPS (M) Developer: Maintain and improve existing software to code medical insurance claims. Software integrates with VA's existing VistA backend.Perl Developer: Maintain expert system web site written in Perl. Created SOAP interface to existing web site.PHP/Javascript Developer: Helped to develop new SOAP rewrite of Perl website core functionality in PHP. Helped to create new potential business opportunities by extending SOAP service to provide “charge-per-transaction” subscription to third-party developers. Assisted in building portal site for potential third-party developers.