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Microsoft Corporation Logo Microsoft Corporation · IT - Software Development

Principal Software Engineer - M365 Core

United States, Redmond 139900.00 - 274800.00 USD / Year · Job Posted February 19, 2026
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Job Description

You'll join the Experimentation and Configuration Service (ECS) team, where you'll build infrastructure that operates at massive scale with billions of requests per day. We're the team that customers trust to deliver configuration changes safely, quickly, and reliably. Our client SDKs are the critical interface between services and the ECS platform, and we're looking for engineers who want to solve hard problems in security, resilience, and distributed systems. As a Principal Software Engineer working on the ECS Client SDK, you'll own the development of client libraries that provide security, resilience, and observability for mission-critical services. You'll design and implement features like authentication, caching with multi-layer fallbacks, telemetry, and failure recovery mechanisms. You'll collaborate with service teams across Microsoft to understand their operational challenges and translate them into reusable SDK capabilities that benefit the entire ecosystem.

Job Responsibility

  • Partners with appropriate stakeholders to determine user requirements for a set of scenarios
  • Leads identification of dependencies and the development of design documents for a product, application, service, or platform
  • Leads by example and mentors others to produce extensible and maintainable code used across products
  • Leverages subject-matter expertise of cross-product features with appropriate stakeholders (e.g., project managers) to drive multiple group's project plans, release plans, and work items
  • Holds accountability as a Designated Responsible Individual (DRI), mentoring engineers across products/solutions, working on-call to monitor system/product/service for degradation, downtime, or interruptions
  • Proactively seeks new knowledge and adapts to new trends, technical solutions, and patterns that will improve the availability, reliability, efficiency, observability, and performance of products while also driving consistency in monitoring and operations at scale and shares knowledge with other engineers
  • Embody our culture and values.

Requirements

  • Bachelor's Degree in Computer Science or related technical field AND 6+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
  • OR equivalent experience.

Nice to have

  • Bachelor's Degree in Computer Science or related technical field AND 10+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
  • OR Master's Degree in Computer Science or related technical field AND 8+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
  • OR equivalent experience.
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