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Power complex applications with clean, secure, and reliable .NET architecture.

.NET Development That's Solid, Scalable, and Enterprise-Ready

At QOLOS, we build robust backend systems and full-stack applications using Microsoft .NET. From enterprise platforms to custom APIs and internal tools, we deliver high-performance solutions built for security, stability, and scale.

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Dependable Code. Real Business Power.

Let’s build your next .NET project with confidence. Talk to our .NET team!

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.NET Development That's Solid, Scalable, and Enterprise-Ready

At QOLOS, we build robust backend systems and full-stack applications using Microsoft .NET. From enterprise platforms to custom APIs and internal tools, we deliver high-performance solutions built for security, stability, and scale.

What We Build with .NET

  • Enterprise Applications – Scalable, multi-user platforms built for long-term growth.

  • Custom APIs & Integrations – .NET-based services connected to ERPs, CRMs, payment systems, and more.

  • Internal Tools & Portals – Automate operations and streamline workflows with secure web apps.

  • Modernization Projects – Rebuild or refactor legacy .NET systems into fast, cloud-ready solutions.

Why QOLOS?

  • Experienced .NET Developers – Deep knowledge of .NET Core, ASP.NET, C#, and the Microsoft stack.

  • Secure by Design – We build with performance, data integrity, and compliance in mind.

  • Integration-Ready – Built to work with your existing systems, databases, and infrastructure.


Dependable Code. Real Business Power.
Let’s build your next .NET project with confidence.

Chad VanCalster

Meet the Expert

We build custom .NET applications that are rock-solid—secure, scalable, and fully integrated with your business systems. Whether you need a new platform, internal tool, or API, we use .NET to deliver reliable solutions that hold up in the real world.

- Chad VanCalster
Contact Chad
Chad VanCalster

Contact Chad VanCalster

Thank You! Your contact information and message has been sent to Chad.

QOLOS is everything you need to build your DREAM TEAM!

We hire the best, and that is why we are the best. You won't be disappointed.

Words can not describe how happy we are with QOLOS! We highly recommend Chad and his team!

Douglas NinnemanMotovation Fitness

Always excellent and a high attention to detail. Highly recommended!

Dr. Jason GospodarekGreen Bay Eye Care


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QOLOS, Inc.

340 N. Broadway St. STE 200

Green Bay, WI 54303

(888) 747-7111

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