Microsoft's M365 Security Engineering team is seeking a Senior Full Stack Engineer to join their cybersecurity efforts. This role combines hands-on development with technical leadership, focusing on protecting Microsoft services against cyber threats. The position involves working with large-scale software systems, security analysis, and big data, analyzing billions of events daily across Microsoft's product ecosystem. The ideal candidate will balance individual contribution with mentoring, while building scalable solutions and cross-team partnerships. The team culture emphasizes inclusion, continuous learning, and customer focus, offering opportunities to work with cutting-edge technologies and contribute to critical security infrastructure. The role offers hybrid work arrangements with up to 50% work from home flexibility, comprehensive benefits, and the chance to impact global cybersecurity solutions. The position requires expertise in both frontend and backend development, with a strong focus on security principles and distributed systems architecture. Team members become advocates for seamless customer experiences while working in an environment that values diverse backgrounds and passionate problem-solving.