Principal Software Engineer

Are you passionate about building the next generation of developer tooling MCPs, and API’s for Microsoft M365’s agent-forward future? Come join a team that values diversity, inclusion, collaboration and working better together to expand the foundation and the core of Substrate.    As a Principal Software Engineer , on the Substrate App Platform team, you will help the next generation platform for internal and external developers and agents to access M365 data and APIs. This role offers the opportunity to think about deep technical problems, define new best practices,  collaborate across teams to achieve shared goals, and grow through continuous learning and innovation alongside your teammates.    In alignment with our Microsoft values, we are committed to cultivating an inclusive work environment for all employees to positively impact our culture every day.    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.    Employees who live within fifty miles of the Redmond campus must be in the office a minimum of 3 days per week.

Design, develop, and maintain scalable Ai forward API’s, MCP’s and services. Identify dependencies and contribute to design documentation with minimal oversight. Develop and implement reusable, high-quality code for services and features. Lead feature development from concept through launch. Break down large work items into smaller tasks and provide accurate estimations. Serve as a Designated Responsible Individual (DRI) working on-call to monitor system/product feature/service for degradation, downtime, or interruptions and gains approval to restore system/product/service for simple problems. Stay current with technologies to improve reliability, performance, and scalability. Provide guidance and mentorship to other team members.

Required Qualifications: 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.   Other Requirements: Ability to meet Microsoft, customer and/or government security screening requirements are required for this role. These requirements include but are not limited to the following specialized security screenings: Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.

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 Bachelor's Degree in Computer Science or related technical field AND 12+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python  OR equivalent experience. Experience shipping complex, enterprise-scale software with emphasis on reliability, scalability, and maintainability.  Proficiency in a back-end programming language (e.g., Node.js, C#, Java).  Experience with RESTful APIs and their design and microservices architecture. Experience with AI/ML concepts and their application in software development.  Knowledge of CI/CD pipelines and automated testing frameworks.  Familiarity with cloud platforms such as Azure, AWS, or Google Cloud.  Portfolio or open-source contributions that highlight versatility across technologies, frameworks, or domains.  Experience with industry standard API design practices,