Open to opportunities

Robert Koernke

@robertkoernke

Message

Senior application developer with 25 years building high-performance web and healthcare integration solutions.

United States

Message

What I'm looking for

I’m looking to keep building and optimizing high-performance application platforms—especially REST/API work, Windows services, and healthcare integrations—while partnering with teams where I can mentor others and deliver reliable, production-ready software.

I’m an Application Developer with 25 years of experience in the IT profession, delivering large commercial web applications and mission-critical integrations across shipping and medical industries. I’ve built and maintained ASP.NET (C#) systems, implemented responsive UI with Bootstrap and Master Pages, and improved performance using multithreaded programming and async/await.

I’m especially strong at connecting complex healthcare workflows—integrating HL7 (2.3–2.5), EMR, DICOM, PACS, and MWL—while also supporting customers through tools like MirthConnect and proprietary interfaces. Recently, I’ve continued building new products, including an LLM-assisted 3-Dimensional Chess3D project and a FamilyVault asset manager with Supabase-PostgreSQL, Cloudflare, Git, and TypeScript, and I mentor junior developers on coding standards and best practices.

Experience

Work history, roles, and key accomplishments

Senior Application Developer

ICOMold by Fathom

Dec 2017 - Dec 2025 (8 years)

Developed and maintained large commercial web applications using ASP.NET and JavaScript. Maintained an instant-quoting revenue generator, built REST APIs, and optimized MySQL performance for large datasets.

ASP.NET C#JavaScript jQuery CSS Bootstrap Responsive UI Master Pages REST APIs JSON Web Services Performance Tuning Async Await Windows Server IIS Windows Services FedEx API PayPal SlimCD

Contract Developer

Custom Design Software

Apr 2017 - Jun 2017 (2 months)

Developed and supported large commercial VB6 software and MS Access database functionality, including tables and queries.

VB6 MS Access Query Creation

Contract Developer

Ann Arbor Digital Devices (A2D2)

Oct 2014 - Apr 2017 (2 years 6 months)

Developed C# WinForms applications and integrated HL7v2 EMR interfaces using proprietary software. Worked with MirthConnect channels and implemented image/video processing and customer technical support.

C#WinForms Image Processing C++

.NET Developer

R.L. Fisher

Jun 2014 - Aug 2014 (2 months)

Built .NET applications backed by SQL Server 2012 and improved performance by resolving timeouts and indexing issues. Refactored and updated legacy stored procedures and used Entity Framework, MVC, and Telerik controls.

.NET C#Database Performance Tuning Stored Procedures Entity Framework MVC Telerik Controls

Application Developer

Microfour

Apr 2009 - Sep 2009 (5 months)

Converted HL7 Version 3 XML medical records using C# .NET and applied CCHIT, HITSP, and CCD methodologies. Developed SDKs to support certification and end-user deployment.

C# .NET HITSP SDK Development

Application Developer

Unival

Oct 2004 - Apr 2009 (4 years 6 months)

Developed web applications using C#, VB.NET, and Classic ASP, including ASP.NET medical websites with shopping carts. Built multithreaded applications and Windows Services, migrated from ASP Classic to ASP.NET, and implemented HL7-related data processing with SQL Server databases and reporting.