Microsoft Development Center in Prague is seeking Senior Backend Software Engineers for multiple teams including Identity Platform/Microsoft Entra, M365 Core IC3 Delivery Platform, M365 Substrate Identity & Authentication, and M365 Intelligent Conversation and Communications Cloud. These roles focus on building and maintaining critical infrastructure that powers Microsoft's core products like Windows, Office, Azure, and Xbox. Engineers will work on solving complex security challenges, expanding email delivery capabilities, providing secure access solutions, and developing real-time communication services. The position offers a hybrid work environment with up to 50% work from home flexibility. Microsoft's culture emphasizes growth mindset and empowering teams to achieve their best. The role requires strong technical expertise in distributed systems, cloud services, and various programming languages, with opportunities to work on large-scale systems serving millions of users.