Pros and Cons of .NET: A Guide to Deciding Whether It Fits Your Project in 2027

.NET remains one of the safest platforms for enterprise systems in 2026, thanks to its high performance, long-term support, and mature ecosystem. Its main drawbacks are the cost of migrating legacy systems and the annual release cycle, which requires planning.

That second point has become urgent: .NET 8 and .NET 9 reach end of support on the same day, November 10, 2026. After that date, applications on these versions will keep running, but they will no longer receive security fixes.

If you are a CTO, IT manager, or technical lead deciding whether .NET is the right choice for a new system (or whether it is worth continuing to invest in it), this guide brings together the pros and cons with up-to-date data, a comparison with other stacks, and a practical decision checklist.

The 30-second summary

• Performance: ASP.NET Core ranks among the fastest web frameworks in independent benchmarks.
• Predictability: one new version per year, with LTS versions supported for three years.
• Versatility: web, APIs, cloud, desktop, mobile, and AI with a single language, C#.
• Watch out for: legacy systems on .NET Framework require a planned migration.
• Watch out for: the annual release cycle calls for a clear upgrade policy.
• Recommendation: .NET is an excellent choice for long-lived enterprise systems, provided the execution (architecture, team, and governance) is done well.

What .NET is today (and why it is no longer the .NET Framework)?

.NET is a free, open-source, cross-platform development platform maintained by Microsoft and the community, used to build web applications, APIs, desktop software, mobile apps, cloud services, and AI solutions, primarily with the C# language.

Many of the criticisms still circulating about .NET come from confusing two generations of the technology:

According to Microsoft’s official website, modern .NET lets you build apps and services for Windows, Linux, macOS, and Docker. It includes components such as the CLR (Common Language Runtime, the environment that executes the code), ASP.NET Core (web framework), Entity Framework Core (data access), and NuGet (package manager).

Pros of .NET

1. High performance

.NET is among the fastest platforms on the market for web applications and APIs. In Round 23 of the TechEmpower Framework Benchmarks, published in February 2025 and an industry reference for over a decade, ASP.NET led the Fortunes test among the most popular back-end frameworks, ahead of Go, Rust, Java (Spring), and Node.js (Express).

One caveat: benchmarks measure each technology’s theoretical limit. In real applications, with databases and integrations, the gap narrows, but it remains relevant. Features such as Native AOT (ahead-of-time compilation, which reduces startup time and memory usage) widen this advantage in microservices.

In practice, for the business: fewer servers to handle the same demand and, as a result, a lower cloud bill.

2. Cross-platform and cloud-ready

Since .NET Core, the platform runs on Linux, inside Docker containers, and on orchestrators such as Kubernetes. It works well on all three major cloud providers (Azure, AWS, and Google Cloud).

In practice, for the business: you are not tied to Windows Server and can choose the most cost-effective infrastructure.

3. Integration with the Microsoft ecosystem

For companies already using Azure, Microsoft 365, SQL Server, or Entra ID (formerly Azure Active Directory), .NET offers native integration, with official libraries and extensive documentation. According to the 2025 Stack Overflow Developer Survey, Azure is used by 26.3% of developers.

In practice, for the business: faster integrations and less custom code to connect systems the company already owns.

4. Security and compliance

C# is a strongly typed language, which prevents entire classes of errors at compile time. The platform receives monthly security updates and includes built-in mechanisms for authentication, authorization, encryption, and data protection, which help meet regulations such as GDPR and Brazil’s LGPD.

In practice, for the business: lower risk of incidents and regulatory issues, which is especially important in sectors such as finance, credit unions, and healthcare.

5. Productivity with C# and mature tooling

C# evolves with each version to reduce boilerplate code. Features such as Minimal APIs make it possible to create a working endpoint in just a few lines. The tooling ecosystem (Visual Studio, JetBrains Rider, and Visual Studio Code, plus integrated AI assistants) is among the most complete on the market.

In practice, for the business: faster delivery and code that is easier to maintain over the years.

6. Predictable support

Microsoft’s official support policy follows a fixed calendar: a major version is released every November. LTS (Long Term Support) versions receive three years of free support; STS (Standard Term Support) versions receive two. Both have the same quality; only the support duration differs.

In practice, for the business: the technology roadmap can be planned years in advance, without surprises.

7. One stack for many products, including AI

With the same team and the same language, you can build web systems, APIs, desktop applications, mobile apps (with .NET MAUI), games (with Unity), and artificial intelligence solutions. For AI, Microsoft offers Semantic Kernel and the Microsoft Agent Framework, which make it easier to build agents and integrate with language models.

In practice, for the business: a single team can cover multiple fronts, which simplifies hiring, management, and maintenance.

8. A large community and talent pool

C# is one of the most widely used languages in the world. In the 2025 Stack Overflow Developer Survey, 27.8% of respondents reported extensive work with C# in the past year, rising to 29.9% among professional developers. Among those who used the language, 55.8% want to keep using it, according to the same survey.

The community is also growing: C# gained around 136,700 new contributors on GitHub between August 2024 and August 2025, a 22.22% increase, according to GitHub Octoverse 2025. For a balanced view: on the TIOBE Index, which measures popularity through web searches, C# ranks 5th in September 2026, down 2.16 points from the previous year, even after being named Language of the Year for 2025.

Having the right technology, however, is only half the equation; the other half is having the right team to use it well. Through software projects with a dedicated squad, NextAge builds technically vetted full-stack teams tailored to each client’s stack, including .NET.

Cons of .NET (and how to mitigate each one)

1. Legacy systems on .NET Framework

Many companies still run critical systems on .NET Framework, which only runs on Windows and no longer receives new features. According to JetBrains’ The State of .NET 2025 report, 35% of .NET developers still work with this version regularly. Migrating takes time, testing, and in some cases rewriting parts of the application.

How to mitigate: start with a technical assessment of the system and migrate incrementally, module by module, without disrupting operations.

If your system still runs on .NET Framework or .NET 8, it is worth acting before November. NextAge’s system modernization service starts with an assessment and quickly defines the plan to upgrade to modern, secure versions.

2. Annual release cycle

The predictable calendar comes at a cost: frequent upgrades. The 2026 case illustrates the challenge well. Because Microsoft extended STS support from 18 to 24 months, .NET 8 (LTS) and .NET 9 (STS) reach end of support together, on November 10, 2026. Teams that chose stability and teams that chose the latest features now face the same deadline.

How to mitigate: adopt an upgrade policy based only on LTS versions and maintain automated test coverage that makes every upgrade predictable.

3. Indirect costs

.NET itself is free. Costs come from the choices around it: Visual Studio Professional and Enterprise editions, Windows Server, and SQL Server are paid products. There is also a natural tendency to concentrate infrastructure on Azure, which can reduce negotiating power with the provider.

How to mitigate: consider license-free alternatives such as Linux servers, PostgreSQL databases, and container-based deployment, all of which work very well with modern .NET.

4. A less dominant front end

Blazor lets you build web interfaces with C#, and its adoption is growing: it reaches 25% of .NET developers, according to JetBrains. Even so, React and Angular have much larger ecosystems of components and professionals.

How to mitigate: combine a .NET back end with a JavaScript or TypeScript front end, a well-established architecture that is easy to maintain with a full-stack squad.

5. Mobile is not its strongest suit

Xamarin, Microsoft’s former mobile solution, reached end of support in May 2024 and was replaced by .NET MAUI. MAUI is functional, but it has lower adoption than Flutter and React Native.

How to mitigate: evaluate case by case. For apps with highly customized interfaces, it may make sense to use another technology for the app and keep .NET on the back end.

6. Learning curve for teams coming from dynamic languages

Developers coming from Python or JavaScript may find C# more formal at first, due to static typing and architectural patterns. The gap has narrowed considerably in recent versions, but it still exists.

How to mitigate: define architectural standards from the start of the project and maintain constant code review, which speeds up the team’s adaptation.

7. Competition for senior developers

Demand for .NET professionals is steady and consistent: C# appeared in around 52,000 job postings in 2025, roughly 10% of offers that name a language in the title, according to DevJobsScanner data compiled by FOSS Post. In practice, senior developers with architecture and migration experience are in high demand, and hiring takes time.

No time to hire .NET developers? NextAge provides a technical squad with a contractual SLA and guaranteed professional replacement, with no impact on your project timeline. Learn about our Software Projects service.

.NET myths and facts

.NET vs. Java vs. Node.js vs. Python

There is no universally best stack; there is the one best suited to the project’s context. The table below summarizes where each one stands out.

In short: Python leads in AI and data, Node.js makes it easier to unify with the front end, and Java has a strong presence in legacy banking systems. .NET stands out when performance, security, and long-term maintainability weigh most in the decision.

When to use .NET (and when to consider another stack)

.NET is a strong choice if your project involves:

• enterprise systems that need to last many years;
• APIs and microservices with high request volumes;
• companies already using Azure, Microsoft 365, or SQL Server;
• regulated sectors, such as finance, credit unions, healthcare, and government;
• modernization of legacy systems already in the Microsoft ecosystem;
• products that combine web, integrations, and AI features.

Consider another stack if:

• the project is a simple MVP and the team only knows JavaScript;
• the core of the product is data science or AI model training;
• the main focus is a mobile app with a highly customized interface.

.NET in 2027: what changes with .NET 10 and .NET 11

The current version landscape, according to Microsoft, is as follows:

For most companies, the recommendation is to migrate to .NET 10, which is supported until 2028 and brings performance improvements over previous versions. .NET 11 will be an STS release, suited to teams that want the latest features and have the maturity to upgrade more often.

How to make sure .NET delivers results in your project

Most of .NET’s drawbacks lie not in the technology but in execution: poorly defined architecture, unplanned migrations, and teams without experience on the platform. Four practices reduce these risks:

1. Define scope and architecture before writing code: clear requirements and a prioritized backlog prevent rework and improvised technical decisions.
2. Standardize on LTS versions: a defined upgrade calendar avoids last-minute rushes like the one in November 2026.
3. Automate testing and review code continuously: this makes upgrades and new features safer.
4. Work with an experienced, stable team: turnover is one of the biggest risks for long-lived systems.

This is exactly where NextAge’s Software Projects service comes in. Scope and backlog are defined before the first sprint, code review is AI-assisted throughout development, and you track progress through reports on delivery and quality. The squad works under your management, with a contractual SLA and guaranteed professional replacement.

Frequently asked questions about .NET

Is .NET still worth it in 2026?

Yes. .NET gets a new version every year, has long-term support guaranteed by Microsoft until 2028 (on .NET 10), and ranks among the fastest platforms for web applications. It is especially well suited to enterprise systems that require performance, security, and long-term maintainability.

Is .NET free for commercial use?

Yes. .NET is free and open source, including for commercial use. Costs only arise from optional tools and infrastructure, such as Visual Studio Professional or Enterprise, Windows Server, and SQL Server, which can be replaced with license-free alternatives.

What is the difference between .NET Framework, .NET Core, and .NET?

.NET Framework is the original version, Windows-only, now maintained solely for compatibility. .NET Core was its cross-platform, open-source rewrite. Starting in 2020, .NET Core was renamed simply .NET, and this is the line that continues to evolve.

.NET or Java: which is better for enterprise systems?

It depends on the context. Both platforms are mature, secure, and widely used in large companies. .NET usually has the edge in performance and integration with the Microsoft ecosystem; Java, in environments that already have a large base of systems in that language, such as parts of the banking sector.

How long is a .NET version supported?

LTS versions receive three years of free support, and STS versions receive two. A new major version is released every November. Currently, .NET 10 is the active LTS version, supported until November 2028.

Can you build mobile apps with .NET?

Yes, with .NET MAUI, which lets you build Android and iOS apps from a single C# codebase. For apps with highly customized interfaces, some companies prefer Flutter or React Native for the app and keep .NET on the back end.

Is it worth migrating a legacy .NET Framework system?

In most cases, yes. Migrating to modern .NET brings performance gains, enables lower-cost deployment on Linux and in the cloud, and ensures security updates. The best approach is to start with a technical assessment and migrate incrementally.

Conclusion

.NET remains one of the most solid choices for companies that need fast, secure, and sustainable systems over the long term. Its drawbacks are real, but most of them are manageable with planning, good practices, and an experienced team.

If your company has applications on .NET 8 or .NET 9, now is the time to act: support ends on November 10, 2026. And if you are evaluating .NET for a new project, the decision is safer when technology and execution go hand in hand.

NextAge has been developing software for over 19 years, with more than 600 projects delivered and over 150 professionals. Talk to a specialist, at no cost and with no commitment, and see how a dedicated squad can get your .NET project off the ground with defined scope, timeline, and quality.

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