Principal Software Engineer
Microsoft Suisse Sàrl is hiring for a Principal Software Engineer to join the Substrate Intelligence Platform (DSX) team, focused on tenant‑isolated fine‑tuning and evaluation infrastructure for Copilot experiences across Microsoft 365. The team supports leading models and open‑source alternatives, operating at massive scale in multi‑tenant environments with strong security and compliance boundaries.
As a Principal Software Engineer, you will play a critical technical leadership role shaping the next generation of Copilot’s fine‑tuning and evaluation infrastructure.
Responsibilities
* Architect and lead the design of large‑scale, distributed services that power tenant‑isolated fine‑tuning and evaluation workflows.
* Drive end‑to‑end technical ownership of critical platform areas, from data ingestion and training orchestration to deployment, rollback, and monitoring.
* Define and evolve secure data movement patterns across tenant boundaries, ensuring compliance with Microsoft security, privacy, and governance requirements.
* Establish long‑term technical vision and roadmap for the Heron fine‑tuning platform, balancing scalability, reliability, cost, and developer velocity.
* Lead cross‑team technical reviews, influencing designs and driving alignment across multiple organizations.
* Build frameworks and abstractions that improve operational excellence, including observability, quota management, failure recovery, and developer ergonomics.
* Act as a technical mentor for senior and junior engineers, raising the bar on design quality, code health, and engineering rigor.
* Partner with engineering managers and product leaders to translate business goals into executable technical strategies.
* Proactively identify and resolve systemic production issues, driving durable fixes rather than tactical mitigations.
Qualifications
* Required Qualifications: Bachelor's Degree in Computer Science or related technical field AND hands on technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience. Proven experience designing and operating large‑scale distributed systems in production. Demonstrated ability to lead technical decisions across multiple teams or services.
* 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 Qualifications: 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 with extensive engineering experience. Experience building platform or infrastructure services in cloud environments (Azure preferred). Deep understanding of multi‑tenant architectures, security boundaries, and privacy‑compliant system design. Hands‑on experience with Azure Machine Learning, Kubernetes, GPU‑backed workloads, or large‑scale data pipelines. Track record of driving architecture simplification, reliability improvements, and cost efficiency at scale. Ability to operate effectively in high ambiguity, influencing without authority and earning trust across org boundaries.
Other information
* Work location 1212 Grand‑Lancy (GE)
* Workload 100%
* Employment start Immediately
* Employment duration Permanent
* Work experience More than 3 years
* Education Bachelor’s degree from a university or equivalent
* English Oral: Very good knowledge; Written: Very good knowledge
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.
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