Tony Konzel is a Senior Software Engineer in Madison, WI with 13 years of experience building backend systems and full-stack features across C#, Java, JavaScript, Ruby, and SQL. He currently leads engineering work at Pharmacy OneSource after prior backend roles at EatStreet and diverse hands-on positions that include classic ASP, .NET, and Ruby stacks. A habitual developer and musician, Tony brings a unique blend of rhythm-driven discipline and retro-hardware curiosity to software problems—evident in his substantial emulator work on the popular BizHawk project where he implemented Commodore 64 memory, VIC/CIA logic, sprite rendering, and input/cartridge state support. He excels at pragmatic engineering: improving legacy systems, shipping reliable backend services, and contributing meaningful open-source backend code. Colleagues rely on him for steady, detail-oriented problem solving and a taste for creative side projects that inform his day-to-day engineering.
13 years of coding experience
7 years of employment as a software developer
Computer Programming/Programmer, General, Computer Programming/Programmer, General at Madison Area Technical College
Music Technology, Music Technology at Madison Media Institute
BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.
Role in this project:
Back-end Developer
Contributions:4 reviews, 321 commits, 16 PRs in 6 years 9 months
Contributions summary:Tony's commits primarily involve implementing and modifying the logic of a Commodore 64 emulator. These changes include additions to the Commodore 64's memory bus implementation, the handling of CIA (Complex Interface Adapter) and VIC (Video Interface Chip) registers, and modifications to the sprite rendering. Additionally, the user has been working to improve the input handling and has incorporated initial support for saving and loading cartridge states.
Contributions:2 releases, 88 commits, 7 PRs in 7 years 11 months
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