Principal Software Engineer

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 sec...