Microsoft Start Network Ranking Infrastructure team is seeking a Principal Software Engineer to lead platform efforts in serving personalized content to 100M+ daily active users across Windows, Edge, Super app, Skype, and Outlook. This role involves working with advanced AI and LLM technologies to deliver high-quality, personalized content experiences. As a hands-on technical leader, you'll be responsible for architecting and developing complex distributed systems, mentoring team members, and driving technical excellence. The position offers competitive compensation, comprehensive benefits, and the opportunity to impact billions of users worldwide. The team emphasizes innovation, collaboration, and technical expertise in building scalable solutions. This role combines technical leadership with hands-on engineering, requiring expertise in distributed systems, front-end technologies, and modern software development practices. Microsoft's inclusive culture and mission to empower every person and organization make this an ideal opportunity for those seeking to make a significant impact in technology.