Principal Software Engineer (CoreAI)

Job ID: 200027347Posted: 2026-08-27Location: United States, Washington, RedmondSalary: USD $142,800 - $274,800 per yearEmployment type: Full-TimeWork site: 3 days / week in-officeRole type: Individual ContributorTravel: Less than 25%Profession: Software EngineeringDiscipline: Software EngineeringCompany: MicrosoftOverviewJoin the team building the future of AI at Microsoft. Are you passionate about creating the next generation of Agent Building experiences? The Microsoft Foundry team within Microsoft CoreAI is on a mission to empower developers and enterprises to design, deploy, and scale cutting-edge Generative AI systems and intelligent agents. We're looking for a Principal Full Stack Software Engineer to join our Microsoft Foundry Agents Platform team, where we’re creating intuitive and powerful agent-building experiences for developers and enterprises. What you’ll work on: Shape the end-to-end experience of our platform that integrates cutting edge LLMs from Providers such as OpenAI, Anthropic, Phi, Meta, OSS and build tools that power robust agentic workflows and enterprise automation. Who we’re looking for: Full stack engineers with strong skills in multiple languages and frameworks like React, Next.js/Remix, Node.js, TypeScript, and Python together with experience in backend service development and/or API-driven developer experience. We value engineers who leverage AI-assisted development tools to achieve exceptional velocity and quality—and who are passionate about LLMs, GenAI, and Azure. Why join us? You'll have the opportunity to work on high-impact, large-scale AI products alongside world-class talent. Help define how the world interacts with agents and intelligent systems. Microsoft’s mission is to empower every person and every organization on the planet to achieve more, and we’re dedicated to this mission across every aspect of our company. Our culture is centered on embracing a growth mindset and encouraging teams and leaders to bring their best each day. Join us and help shape the future of the world.  ResponsibilitiesLeverage modern, AI-assisted development practices and tooling to accelerate delivery while maintaining high code quality Architect full stack solutions that span from user experience and code-first platforms to backend data and service layers Develop software using languages such as TypeScript, JavaScript, React, Python, and others Design, develop, and maintain backend services and APIs that support agentic workflows and platform capabilities Collaborate with partner teams to comprehend, define, enhance, and develop AzureML capabilities Respond, resolve, and integrate customer feedback with agility and dedication Lead by example, adhering to best engineering practices, raising the quality bar, and improving the team's response to customer incidents QualificationsRequired 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 PythonOR 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.Preferred Requirements: 6+ years of technical engineering experience with coding in languages including, but not limited to TypeScript, JavaScript, React, Python, C#, Node.js, OR equivalent experience 6+ years of experience in platform or front-end development using multiple languages and frameworks including JavaScript, TypeScript, and React 4+ years of experience in backend service development (APIs, microservices, or distributed systems) OR 4+ years of experience in creating developer platforms (APIs, SDKs, CLIs, etc.) Demonstrated proficiency with AI-assisted software development tools and workflows (e.g., AI coding agents, LLM-powered development environments) Expertise in LLM and GenAI Application development. Deep understanding of modern front-end technologies such as NextJS / Remix , SSR , Web Components, and performance optimization techniques Experience with distributed systems design and implementation Experience designing and building RESTful APIs or GraphQL services Track record of high development velocity through effective use of AI coding assistants and automation Experience orchestrating complex development workflows across multiple concurrent workstreams Familiarity with backend technologies such as Node.js, Python, or C# for service development Knowledge of industry APIs and developer platforms for LLM-driven agentic systems Experience with database technologies (SQL, NoSQL, or vector databases) Passion for machine learning, artificial intelligence, and data science. Experience working on large-scale Ui-intensive product development Software Engineering IC5 - The typical base pay range for this role across the U.S. is USD $142,800 - $274,800 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $188,000 - $304,200 per year. Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here:Software Engineering IC6 - The typical base pay range for this role across the U.S. is USD $165,600 - $296,400 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $220,800 - $331,200 per year. Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here:This position will be open for a minimum of 5 days, with applications accepted on an ongoing basis until the position is filled.Microsoft is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance with religious accommodations and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.