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. More and more large companies that previously relied on Python, Java, or outdated technologies are announcing their migration to the C# (.NET) platform. This trend has already been dubbed the "return to reliability" — and for good reason.

According to the latest reports from major analytical agencies, the share of new enterprise projects starting on .NET has grown by 23% compared to 2023. Among the companies that switched to C# this year are banks, retailers, logistics giants, and even several government platforms.

Why are companies choosing C# in 2025?

Experts highlight five key reasons for the mass transition to C# (.NET):

• Performance and optimization. Thanks to modern versions of .NET (8 and 9) and native AOT compilation, applications in C# run 2-3 times faster than similar ones in Python, with lower resource consumption.
• Core-level security. Built-in protection mechanisms, strong typing, and the absence of global interpreters make C# one of the safest languages for the financial sector and personal data processing.
• Cross-platform capability. .NET Core and MAUI allow you to write code once and run it on Windows, Linux, macOS, mobile devices, and even in the browser via Blazor.
• Flexibility for microservices. C# is ideal for building scalable microservice architectures — lightweight containers, high startup speed, and excellent integration with Kubernetes.
• Stability and Microsoft support. Unlike some open-source ecosystems, C# has guaranteed long-term support (LTS) and regular updates from Microsoft.

Migration cases: who has already made the switch?

Among the prominent examples of 2025 is the largest European bank BNP Paribas, which moved its high-load transaction processing systems to C#. The result: a 40% reduction in API response time and a 25% decrease in server infrastructure costs.

The Russian marketplace "Yandex.Market" announced a gradual migration of part of its backend services from Python to C# to improve stability during peak loads. And the logistics company DHL implemented .NET for its warehouse robot management system — C# showed better predictability of task execution time.

What does this mean for developers?

For engineers skilled in C#, new career opportunities are opening up. The average salary of a C# developer in the enterprise segment has increased by 15-20% compared to last year, and the number of job postings requiring .NET has grown by 30%.

If you were still unsure whether to learn C# — 2025 provides a clear answer. The .NET platform is not just alive; it is becoming the standard for corporate development. And the best time to get started is now.

Follow updates on PythonLib — we will publish analyses of the technical aspects of migration and interviews with developers who have already switched to C#.