Progress Sitefinity Development · .NET CMS Specialists

Sitefinity development, modernization, and performance for enterprise .NET teams.

We are a specialist .NET development studio working with enterprise teams already running Progress Sitefinity. Custom modules and widgets, version upgrades, performance audits, and modern Vue 3 frontends embedded directly inside Sitefinity ASP.NET MVC, without rewriting the backend or moving to the .NET Core Sitefinity Renderer.

Hands-on with Sitefinity since 2010, when the platform was on version 3.7. We have shipped on every major release in every delivery model the product has had: WebForms, ASP.NET MVC, Feather, the .NET Core Sitefinity Renderer, and headless over OData and GraphQL.

Start a Sitefinity project Read the Vue 3 + Vite guide
15+
Years in Progress Sitefinity
v3.7 → current
Version experience
Vue + .NET
Delivery sweet spot
MVC + Renderer
Frontend stacks shipped

What is Progress Sitefinity

An enterprise content management system built on ASP.NET.

Progress Sitefinity is an enterprise content management system that runs on the Microsoft .NET stack. Telerik first released it in the mid-2000s, and Progress Software acquired Telerik (and Sitefinity) in 2014. The current generation runs the CMS backend on ASP.NET 4.x and offers an optional .NET Core "Sitefinity Renderer" for headless frontend delivery, so teams can run classic MVC pages, the Renderer, or any external Vue, Nuxt, React, or Next.js frontend consuming the OData and GraphQL services.

It runs on Windows Server with SQL Server, on Microsoft Azure, or on Sitefinity Cloud (Progress's hosted offering). It sits in the same enterprise .NET CMS category as Optimizely, Kentico Xperience, Umbraco, and Sitecore.

Progress Sitefinity CMS logo

What ships in the box.

A standard Progress Sitefinity install, before any custom code, gives a marketing or content team:

  • Typed content model with dynamic modules, taxonomies, and classifications
  • Multi-site management from a single installation
  • Multilingual content with 100+ supported locales
  • Visitor segmentation, scoring, and A/B testing
  • Editorial workflows with scheduling, approvals, and rollback
  • OData REST and GraphQL services for headless delivery
  • Active Directory, SAML SSO, and Azure AD integration
  • Built-in form builder, search, image library, and CDN support

Where Sitefinity earns its license fee.

Long-lived, multi-site, multi-language environments. A government agency running 30 departmental sites in four languages. A university with 50 program pages per faculty and a separate site for the medical school. A manufacturer publishing product catalogs to 12 distributor regions. These are jobs where copy-pasting the same content into a flat-file static site generator every six months becomes a full-time hobby. Sitefinity treats them as configuration: shared content libraries, locale fallbacks, per-site theming, scheduled translation, and one editorial backend for every site.

We work on Sitefinity for government agencies, financial services firms, higher education institutions, healthcare networks, manufacturers, and enterprise B2B teams. These tend to be organizations with long-lived sites, multiple country variants, strict editorial governance, and an IT department that already runs .NET.

Sitefinity development services

What we actually deliver.

Custom Sitefinity development
The widgets, dynamic modules, Web API endpoints, and CRM integrations the in-house team has been postponing. We work inside the existing Sitefinity solution structure, follow whatever conventions are already in place, and hand back code your team can maintain after we leave.
Sitefinity upgrades and migrations
Version-aware upgrade plans from WebForms and early MVC through the current Sitefinity Renderer. Content, URLs, redirects, and SEO stay intact. We map every breaking change before touching the codebase, so stakeholders know what is going to move and what is going to stay.
Performance and Core Web Vitals
We profile the Sitefinity rendering pipeline, output cache, Entity Framework queries, and frontend payloads, then fix what is actually slow. Reports come with before-and-after numbers and specific code changes, not generic recommendations.
Vue 3 + Vite on Sitefinity MVC
Modern Vue 3, Vite, and Tailwind CSS embedded directly inside Sitefinity ASP.NET MVC widgets and pages. Editors keep the CMS and widget structure they already know. The delivery layer gets a modern JavaScript toolchain, code-splitting, hot reload, and a clean upgrade path, without rewriting the backend or adopting the .NET Core Sitefinity Renderer. The exact pattern is documented end-to-end in our Vue 3 + Vite guide.
Embedded specialist support
A senior Sitefinity developer on call for in-house teams and agencies that need the expertise without a permanent hire. White-label engagements welcome. Typical retainers range from a few hours a week to embedded multi-month builds.

How we work

A Sitefinity engagement that reads the code before it touches it.

Every Sitefinity install is shaped by the team that built it: content model, custom widgets, upgrade history, quirks. Our engagements start by reading that shape, not by overwriting it.

  1. 01

    Listen

    Read the Sitefinity solution, content model, widgets, upgrade history, and performance profile before opening a terminal.

  2. 02

    Scope

    A version-aware plan with clear tradeoffs. What moves, what stays, what it costs. No vague decks.

  3. 03

    Build

    Work lands in branches against real Sitefinity content and the actual CMS. Deploys stakeholders can click through.

  4. 04

    Hand off

    Documented changes, a path to repeat them, and what to watch after we leave. Your team owns the result.

Featured Sitefinity guide

Vue 3 + Vite 8 + Tailwind CSS v4 on Sitefinity CMS.

A full walkthrough of running a modern Vue 3.5 and Vite 8 frontend, with Tailwind CSS v4 and code-split widgets, on top of current Sitefinity ASP.NET MVC, without adopting the .NET Core Renderer. Published March 19, 2026.

Read the full guide

More Sitefinity guides and fixes

Hands-on Sitefinity writing from the blog.

Open source Sitefinity tools

Tools we built for our own Sitefinity work, free on GitHub.

These come out of daily Sitefinity development, not a marketing plan. We use both on real client projects, which is why they stay maintained.

Install-Package SitefinityAssemblyScanner

Sitefinity Assembly Scanner

Makes every Sitefinity build about 5 seconds faster. Feather's built-in ScanControllerContainerAssemblies.ps1 step loads every DLL in bin into a CLR just to read two attributes, roughly 5,000 ms per build. This native Rust executable reads the same metadata directly in about 40 ms, with byte-identical output.

One self-contained 360 KB executable. No PowerShell, no .NET runtime on build agents, zero configuration: the NuGet package wires the MSBuild target for you.

View on GitHub

SitefinityCommunity.Mcp

Sitefinity Community MCP Server

A Model Context Protocol server that gives Claude Code, Cursor, and any MCP client direct access to a running Sitefinity site: error and trace logs, installed modules, page routes and widget properties, Module Builder content types, config sections, and where-used lookups before a refactor.

Ships as an MCP server on your dev machine plus a Sitefinity plugin, with multi-environment switching and API key validation. Credential-like config values are always redacted.

View on GitHub Read the announcement post

Sitefinity FAQ

Questions teams ask before starting a Sitefinity project.

What is Progress Sitefinity used for?
Progress Sitefinity is an enterprise content management system built on ASP.NET. Companies use it to run a small number of large websites: marketing or product sites with hundreds to thousands of pages, multiple language versions, and dozens of editors. The selling point versus simpler CMSs is that one Sitefinity install covers multiple sites, multiple locales, personalization rules, and a real editorial approval workflow without bolting on third-party tools.
Is Sitefinity a headless CMS?
Sitefinity supports both traditional ASP.NET MVC delivery and headless delivery through OData and GraphQL services. It is best described as a hybrid CMS. Teams can run full Sitefinity MVC pages, a .NET Core Sitefinity Renderer app, or an external Vue, Next.js, or React frontend consuming the Sitefinity content APIs. Our work focuses on the MVC pattern, with Vue 3 and Vite embedded inside existing Sitefinity MVC widgets.
What .NET versions does current Progress Sitefinity support?
Current Sitefinity releases run the CMS backend on ASP.NET 4.x and the optional Sitefinity Renderer on modern .NET Core as a separate frontend application. The exact supported versions move with each Sitefinity release, so we verify against the current Progress release notes on every engagement before committing to a target version.
How much does a Sitefinity upgrade cost?
A Sitefinity upgrade scales with the number of custom widgets, dynamic modules, integrations, and templates in the build, not the raw jump in version numbers. We audit the existing implementation, estimate effort per custom area, and deliver a version-by-version upgrade plan so stakeholders know what breaks, what changes, and what stays identical. A small upgrade can run a few weeks; a multi-version legacy WebForms-to-Renderer migration is typically a multi-month program.
Can Sitefinity run with Vue or React?
Yes. Sitefinity can host Vue, React, and other JavaScript frontends in three patterns: embedded inside ASP.NET MVC widgets and pages, rendered through the .NET Core Sitefinity Renderer, or consumed purely as a headless content API by an external Node app like Next.js or Nuxt. We specialize in the first pattern: Vue 3 and Vite builds embedded directly inside Sitefinity ASP.NET MVC, without adopting the Sitefinity Renderer and without splitting the frontend into a separate Node application. That pattern is documented end-to-end in our Vue 3 + Vite guide.
How does Sitefinity compare to Optimizely, Kentico, Umbraco, and Sitecore?
Sitefinity sits in the same enterprise .NET CMS category as Optimizely, Kentico Xperience, Umbraco, and Sitecore. It tends to be the strongest fit when teams need structured content, multisite, multilingual, and personalization without the licensing weight of Sitecore or the commerce focus of Optimizely. It is closer to Kentico Xperience in feel, with stronger out-of-the-box editorial features than open-source Umbraco. We help teams evaluate fit and modernize any of these platforms.
Do you offer Sitefinity support as a subcontractor or white-label partner?
Yes. We work directly with end clients and as a white-label Sitefinity development partner for digital agencies that need specialist expertise without a permanent hire. Engagements range from single widget builds and performance audits to multi-month upgrade and modernization programs.

Talk to a specialist Sitefinity developer.

Whether you are planning a Sitefinity upgrade, fighting Core Web Vitals, bolting a Vue frontend onto MVC, or looking for a white-label Sitefinity partner, we are happy to dig in.

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