Xiaowen Zong
Redmond
Overview
4
4
years of professional experience
Work History
Software Engineer
Microsoft
07.2023 - Current
- Sole owning engineer for multiple MDO components, including QBAR Helper, QBAR API, and Tuning Service.
- Led the design and implementation of a new tuning tool in response to compromised Crop Net infrastructure, reducing security risk and improving system reliability.
- Resolved tuning notebook unresponsiveness; increased parallelizable optimizations from 1 to ~4, reducing average job runtime by 23%.
- Refactored QBAR Helper and QBAR API to .NET Core, resolving 20+ production Component Governance alerts.
- Enabled dynamic click‑model updates, automated QBAR updates, and Uber Market‑level tuning, etc. in the tuning tool.
- Collaborated with partner teams to migrate authentication mechanisms across MDO‑owned services.
Data Scientist
Microsoft
07.2023 - Current
- Contributed to Uber Market migration by migrating the TA Argo model from individual Traffic Groups (TGs) to Uber Market; designed Uber Market QBARs, set up flights, and monitored performance.
- Led PFairDefect / PACFairDefect tuning for mainstream traffic:TA: improved pFairDefect and pACFairDefect metrics by ~5%
PA: reduced pFairDefect by ~15% with ~5% pDefect tradeoff - Prototyped and enhanced the Demand Acquisition Cost (DAC) ingredient, achieving improved tradeoffs across DAC RPM, ex‑DAC RPM, and quality metrics.
- Delivered PME and ADLFE migrations and performed secret rotation for Argo and Themis, impacting 40+ data pipeline jobs.
- Built monitoring dashboards including TAC rate monitoring and PA action‑signals dashboards.
Software Engineering Intern
Microsoft
05.2022 - 07.2022
- Co-developed the Edge Wallet Restore feature in C++, leveraging a Key Encryption Key (KEK)–based design.
- Enabled secure user authentication to Google Drive via OAuth 2.0 and encrypted storage of recovery secrets for wallet restoration.
Timeline
Software Engineer
Microsoft
07.2023 - Current
Data Scientist
Microsoft
07.2023 - Current
Software Engineering Intern
Microsoft
05.2022 - 07.2022