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

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

2025 has become a turning point for corporate development. Contrary to predictions about Python dominating the AI sphere and JavaScript ruling the web, more and more global giants are making a strategic choice in favor of the C# and .NET ecosystem. Migration to C# is no longer just a local decision by IT departments — it is a conscious trend that is reshaping the enterprise development landscape.

Why C# and .NET?

The switch to C# (.NET) in 2025 is driven by several key factors:

• Performance and scalability. The release of .NET 9 brought significant improvements to the garbage collector and JIT compiler. According to TechEmpower benchmarks, ASP.NET Core now handles up to 7 million requests per second on a standard server — this is 3-4 times faster than Node.js and comparable to Go.
• Cross-platform without compromises. .NET MAUI and Blazor allow writing code for desktop, mobile, web, and even embedded systems in a single language. Companies save up to 40% of time on maintaining different platforms.
• Security and typing. In the era of data leaks, C#'s strict static typing and built-in security mechanisms (e.g., Source Generators) provide an advantage over dynamic languages.
• Integration with AI and the cloud. Microsoft is actively embedding AI agents into .NET. Semantic Kernel, ML.NET, and native support for Azure OpenAI make C# convenient for hybrid solutions (classic backend + LLM).

Migration Cases: Who Is Migrating and Why?

The 2025 trend is confirmed by real actions of market leaders:

• Siemens announced a gradual replacement of Java microservices with C# in industrial control systems. The reason is better support for real-time computing and a lower total cost of ownership on Azure.
• Goldman Sachs migrated its trading platform from C++ to C# using .NET Native AOT. Result: a 15% reduction in latency while maintaining low-level control.
• Uber Eats launched a pilot project to replace part of its Python services with C# for payment processing. The reason is 2 times fewer runtime errors and simpler codebase maintenance.
• Russian banks (Sber, T-Bank) are expanding their use of .NET for fintech solutions. Amid import substitution, C# remains one of the few languages with full Linux support and cross-platform capabilities.

What Does This Mean for Developers?

For IT professionals, the 2025 trend means growing demand for C# developers. According to HeadHunter, the number of job openings for .NET specialists increased by 35% compared to 2024. Salary offers for senior-level positions have closely approached those of Go and Rust.

If you are not yet familiar with C#, now is the best time to start. The language combines the power of systems programming with the convenience of high-level tools, and the .NET ecosystem is becoming the standard for enterprise solutions.

Stay tuned for updates on PythonLib — we will be publishing materials on C# and .NET, including comparisons with Python and migration examples.