Open to opportunities

Zachary Warfel

@zacharywarfel

I modernize legacy systems into stable .NET applications and reliable data solutions.

I'm currently modernizing legacy OpenVMS Fortran systems at U.S. Steel, re-architecting decades-old process control logic into maintainable .NET solutions and Ignition projects.

I build C#, ASP.NET, .NET Core, T-SQL, JavaScript, and PostgreSQL solutions that preserve critical business rules while improving reliability and data exchange between legacy and modern platforms.

At True Manufacturing, I reverse-engineered legacy applications, modernized .NET systems into domain-driven MVC/OOP architectures, and designed internal and external APIs for departments and partners. I also strengthened security through Windows Authentication, IP whitelisting, JWT tokens, and strict regex validation.

I've led clean-code adoption, automated manual work with C# utilities and PowerShell scripts, maintained SQL reports, jobs, and SSIS packages, and contributed PHP plugins and QA work for a corporate WordPress site.

Experience

Work history, roles, and key accomplishments

Current

Process Control Engineer

Current

U.S. Steel

May 2026 - Present (5 months)

Analyze and modernize legacy OpenVMS Fortran code and systems, re-architecting them into new .NET solutions and Ignition projects. Reverse-engineer complex process control logic and design data solutions backed by PostgreSQL.

C#ASP.NET .NET Core T SQL JavaScript PostgreSQL Ignition Claude Code Reverse Engineering Legacy Modernization Domain Driven Design Clean Code

Software Developer II

True Manufacturing

Nov 2021 - May 2026 (4 years 6 months)

Reverse-engineered legacy applications and modernized outdated .NET systems into domain-driven MVC/OOP architectures. Designed and maintained internal and external .NET APIs, implemented security measures, and built SQL-based reports and SSIS packages.

C#.NET ASP.NET MVC Object Oriented Programming Domain Driven Design SQL Server SSIS PowerShell WordPress PHP Security JWT Authentication Regex Clean Code

Factory Employee

True Manufacturing

Jan 2019 - Nov 2021 (2 years 10 months)

Produced subassembly components and ensured quality standards were met. Powder-coated parts in custom colors and inspected components entering and exiting the coating process.

Store Manager

Florissant Food & Packaged Liquor

Aug 2012 - Jan 2019 (6 years 5 months)

Managed daily operations including payroll, hiring, inventory, loss prevention, and sales. Oversaw staff performance and maintained efficient store workflows.