Custom Software
Development
Development
Software built for how your business actually works
Paragon9 is a custom software development company specializing in .NET applications for mid-market businesses in Phoenix, AZ and beyond. We build line-of-business applications, web portals, mobile apps, API integrations, and cloud-native systems on Microsoft Azure — from requirements through production delivery and ongoing support.
.NET Custom Application Development The Microsoft stack, done right
Paragon9 builds custom software on ASP.NET, C#, Entity Framework, and Azure PaaS — the same enterprise-grade stack that powers some of the world's largest business applications. Whether you're building a new line-of-business tool from scratch or replacing a legacy system that's holding your business back, we deliver production-quality code with built-in testing, CI/CD pipelines, and documentation that makes future maintenance straightforward.
Agile Delivery — Working Software Every Sprint No surprises at the end
Paragon9 uses an agile Scrum methodology with two-week Sprints. At the end of every Sprint, you see working, deployable software — not status updates, not wireframes, not promises. This means you can validate direction early, provide feedback while there's still time to act on it, and reprioritize as your business needs evolve. Our clients consistently report receiving working software up to 50% faster than comparable waterfall engagements.
Legacy System Modernization Keep your data, replace the limitations
Most mid-market businesses have at least one critical system that's held together with exports, manual re-entry, and institutional knowledge. Paragon9 specializes in modernizing legacy .NET applications — extending them with new web or mobile front-ends, integrating them with modern cloud services, and migrating them to Azure PaaS — without requiring you to replace your existing database or data model. Your data stays intact; the limitations go away.
Cloud-Native on Microsoft Azure Built to scale, not to babysit
Every application Paragon9 builds is designed for Azure PaaS — meaning you get automatic scaling, built-in high availability, and managed infrastructure that doesn't require a server administrator. We use Azure App Service, Azure SQL, Azure Functions, Azure Service Bus, and Azure Key Vault as the default building blocks, giving your application the reliability and security posture of enterprise infrastructure without the overhead of managing it.
Real Apps. Real Fast.
You need a .NET development partner who can start delivering working software within weeks — not months into a discovery phase. Paragon9 is ready. Tell us what you're building, what's broken, or what's slowing your business down — and we'll tell you exactly what we'd do about it.
What We Build
Line-of-Business Apps
Internal tools, portals, dashboards, and workflow applications that run your operations.
Web Applications
Customer portals, self-service platforms, SaaS products, and enterprise web apps on Azure.
Mobile Apps
iOS and Android apps that connect your employees and customers to your business systems.
API & Integrations
RESTful APIs, Azure Logic Apps, and Service Bus integrations that connect your systems reliably.
Frequently Asked Questions
What is a custom software development company?
A custom software development company builds software applications specifically designed for a client's unique business requirements — as opposed to off-the-shelf software that requires your business to adapt to the tool. Paragon9 is a custom software development company specializing in .NET applications on Microsoft Azure, serving mid-market businesses in Phoenix, AZ and beyond.
How do you price custom software development?
Paragon9 offers two engagement models. For projects with a well-defined scope, we offer fixed-price project engagements with clearly defined deliverables. For ongoing development and maintenance needs, we offer Managed DevOps — a subscription model where you get continuous development, testing, and support at a predictable monthly cost. We recommend starting with a free strategy call to scope your project before committing to either model.
Do you work with businesses outside of Phoenix, AZ?
Yes. While Paragon9 is based in Tempe, AZ (in the Phoenix metro area), we work with clients across the United States. Our team works remotely and communicates through Microsoft Teams, with regular Sprint reviews and project checkpoints. Many of our longest-tenured client relationships are with companies we have never met in person.
What makes Paragon9 different from other .NET development companies?
Three things distinguish Paragon9: First, we focus exclusively on the Microsoft stack — .NET, Azure, Microsoft 365, and Dynamics 365 — which means deep expertise rather than surface-level coverage. Second, we specialize in mid-market businesses with 50–250 employees, which means our engagement model, pricing, and communication style are calibrated for companies that are not enterprise clients but have real enterprise-grade requirements. Third, we offer Managed DevOps — a subscription model where we continue maintaining and evolving your software after the initial build, eliminating the "build and abandon" problem common in the industry.
