Senior Software Engineer

Security represents the most critical priorities for our customers in a world awash in digital threats, regulatory scrutiny, and estate complexity. Microsoft Security aspires to make the world a safer place for all. We want to reshape security and empower every user, customer, and developer with a security cloud that protects them with end to end, simplified solutions. The Microsoft Security organization accelerates Microsoft’s mission and bold ambitions to ensure that our company and industry is securing digital technology platforms, devices, and clouds in our customers’ heterogeneous environments, as well as ensuring the security of our own internal estate. Our culture is centered on embracing a growth mindset, a theme of inspiring excellence, and encouraging teams and leaders to bring their best each day. In doing so, we create life-changing innovations that impact billions of lives around the world.

The Authentication Infrastructure team builds and operates the foundational infrastructure behind Microsoft’s identity platform, delivering the secure, scalable, and highly available systems that power sign-in and access across Microsoft 365, Azure, and Entra. The team focuses on platform reliability, security, and performance at global scale, enabling safe, seamless authentication experiences for billions of users and services.

Microsoft’s mission is to empower every person and every organization on the planet to achieve more. As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond.

Responsibilities

AI-Native Development Applies AI-assisted development practices across the lifecycle to improve productivity, code quality, and operational safety. Takes ownership of AI-generated artifacts and uses data and engineering metrics to continuously improve development and live-site operations for large-scale authentication systems. Coding Writes and reviews secure, reliable, and performant code that powers critical authentication infrastructure, including token services, session systems, and key management. Emphasizes diagnosability, telemetry, and resiliency to support high-scale, mission-critical services. Uses data, monitoring, and incident learnings to continuously improve system quality and reduce production risk. Design Designs and evolves distributed systems that operate at global scale, ensuring high availability, security, and performance of authentication services. Considers end-to-end system interactions across dependencies, incorporating security, compliance, and resilience into architecture decisions. Drives designs that are testable, observable, and built for safe deployment and rapid recovery. Engineering Excellence Applies strong engineering fundamentals to deliver secure, compliant, and scalable infrastructure. Emphasizes automation, safe deployment practices, and “security by design” to protect sensitive auth flows and data. Partners across teams to ensure systems meet reliability, scalability, and compliance requirements in production environments. Implement Executes projects that deliver secure and reliable infrastructure improvements, using safe deployment practices such as progressive rollout and feature flagging. Plans for scale, failover, and disaster recovery, ensuring systems can operate continuously under high load and failure scenarios. Reliability and Supportability Builds and operates highly reliable systems with deep observability, telemetry, and monitoring. Participates in on-call rotations and drives rapid incident response, root cause analysis, and long-term fixes to improve service health. Continuously invests in automation and tooling to enhance live-site operations and reduce incident impact. Understand User Requirements Collaborates with internal partners to translate platform and customer needs into secure, scalable infrastructure solutions. Balances usability, performance, and security to deliver seamless authentication experiences for global users and services.