Major Companies Are Switching to C# (.NET): The 2025 Trend

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Large Companies Are Switching to C# (.NET): The 2025 Trend

2025 has become a turning point for corporate development: more and more major market players are abandoning legacy solutions and choosing the C# (.NET) platform. According to analysts from Stack Overflow and GitHub, the number of new corporate projects in C# has grown by 34% compared to 2024. Why are industry giants massively migrating to .NET — we explore this in our article.

Reasons for the Switch: Why is .NET Winning?

There are three main drivers for the switch to C# in 2025:

Performance and Cost Savings. .NET 9 (released in fall 2024) showed a performance increase of up to 40% on server workloads. For large businesses, this translates directly into savings on cloud resources — up to 30% reduction in infrastructure costs.
Cross-platform Capability. Thanks to .NET MAUI and Blazor, companies write a single codebase for Windows, Linux, macOS, mobile devices, and the web. In 2025, this has become the standard for enterprise solutions.
Security and Support. Microsoft has invested $2 billion in developing the .NET ecosystem, including tools for security auditing and automatic dependency updates — critically important for banks and insurers.

Who Has Already Switched?

The list of companies that have announced a full or partial migration to C# in 2025 is impressive:

JP Morgan Chase — is migrating 70% of its backend systems from Java to .NET, citing better integration with Azure AI.
Siemens — all new industrial controllers are being written in C# on .NET IoT.
Uber — is rewriting its routing service from Go to C# due to GC (Garbage Collection) issues under high loads.
Russian Banks — VTB and T-Bank (formerly Tinkoff) have announced the migration of some microservices to .NET to accelerate the development of financial products.

Expert Opinion: What Are Developers Saying?

Mikhail Krylov, CTO of a large fintech company (which switched to .NET in early 2025), notes: "C# has ceased to be a 'language for Windows applications.' Now it's a fast, modern tool with excellent async support and powerful LINQ. We reduced the development time for a new API by 25% compared to the Python stack."

According to a JetBrains survey from January 2025, 41% of developers who switched to C# in the last two years cite better multithreading support and built-in tools for working with AI (ML.NET, Semantic Kernel) as the main reason.

What Does This Mean for the Job Market?

Demand for C# developers in 2025 has grown by 50% compared to 2023. The average salary for a senior C# engineer in Russia has exceeded 450,000 rubles, and in the USA — $180,000 per year. Experts predict that by 2026, C# will enter the top three most in-demand languages for corporate development, surpassing Java and Go.