About Sinnard Technologies

At Sinnard Technologies, my mission is to bring affordable technology solutions to our community and help businesses grow through modern, reliable software.

I’m Justin Sinnard, an indie developer based in Oshkosh, Wisconsin. I build real, production-ready apps, websites, and software systems from the ground up.

Justin Sinnard

What I Bring

  • Mobile Apps: iOS with SwiftUI, Android with Jetpack Compose
  • Websites: modern business websites, landing pages, SEO-focused pages, and Blazor web apps
  • UI/UX Development: clean layouts, user-friendly flows, responsive designs, and app redesigns
  • Backend: .NET / C#, Entity Framework, SQL, APIs, Azure hosting, and cloud infrastructure
  • Architecture: token-based auth, multi-environment setups, data sync, analytics, and error logging
  • Product Mindset: I’m also a product owner of PumpPal

Whether you need a small internal tool, a professional website, a full public mobile app, or help rescuing an existing project, I can step in as a hands-on builder and technology partner.