Job Description
Principal Software Engineer
Microsoft Suisse Sàrl Vacant since : Number of jobs : 1 1214 Vernier (GE) 100% Immediately Permanent
Overview
Microsoft 365 Copilot is transforming productivity by integrating large language models with user data, Microsoft Graph, and the web. At the core of this innovation is the Substrate Intelligence Platform (DSX) team, which powers personalized, secure, and scalable Copilot experiences across Microsoft 365—Teams, Word, Excel, PowerPoint, OneNote, and beyond.
Our team is pioneering the infrastructure for tenant‑isolated fine‑tuning, a foundational platform capability that enables customers to safely personalize Copilot agents using their own data. This includes support for leading OpenAI models (e.g., GPT‑5, O4 Mini) and open‑source models such as Qwen, Mistral, and GPT‑OSS.
We own the end‑to‑end fine‑tuning platform via Heron, spanning: Data extraction and isolation; Secure training and evaluat...
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