OverviewDo you want to help shape the future of .NET, one of the world’s most widely used open-source developer platforms? We are looking for a passionate Software Engineer to design and build modern, high-performance libraries that power millions of applications across desktop, mobile, cloud, and IoT environments. In this role, you will contribute to .NET libraries and the broader .NET. You will help design and implement new features, improve existing components, and enhance core platform capabilities across areas such as the Base Class Library (BCL), data access frameworks, and web application frameworks. You will work on engineering problems involving performance, scalability, reliability, APIs, and developer experience. This includes designing clean, maintainable architectures, improving efficiency, and building solutions that developers worldwide rely on every day. We embrace modern engineering practices, including AI-assisted development workflows. You will leverage AI tools and technologies to accelerate development, improve code quality, assist with code generation and refactoring, enhance debugging and testing, automate repetitive tasks, and support faster experimentation and problem solving. We value engineers who can effectively combine software engineering fundamentals with emerging AI capabilities to deliver better outcomes. As part of our open development culture, you will collaborate with engineers and the global developer community through GitHub, contributing to discussions, design proposals, code reviews, and open-source initiatives. You’ll have the opportunity to influence the direction of a platform used by millions of developers around the world. ResponsibilitiesDesign, develop, and maintain the .NET Core libraries across multiple areas and platforms Implement new library features and evolve existing APIs to improve performance, usability, and developer productivity Leverage AI-assisted development tools and practices to improve engineering productivity and accelerate implementation Investigate, diagnose, and resolve complex issues across Windows, Linux, macOS, iOS, and Android Optimize libraries for a wide variety of workloads including mobile, desktop, and cloud-native applications Collaborate with other engineering teams and participate in open-source development on GitHub Contribute to design discussions, code reviews, and architectural decisions for the platform QualificationsBachelor’s or Master’s degree in computer science or a related field, or equivalent work experience.Solid programming skills in one or more of the following languages: C#, Java, C++, or Python.Passion for developer experience and an eagerness to understand what makes great tools.Excellent written and verbal communication skills with the ability to collaborate across diverse, distributed teams. Software Engineering IC3 - The typical base pay range for this role across Czechia is Kč 966,000.00 - Kč 1,727,000.00 per year. Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here:https://careers.microsoft.com/v2/global/en/corporate-pay/czech-republic-corporate-pay.htmlThis position will be open for a minimum of 5 days, with applications accepted on an ongoing basis until the position is filled.Microsoft is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance with religious accommodations and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.