
Jiyun L.
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Data Analyst
Confidential • Full time
Nov 2024 - Present • 1 yr 11 mos
• Reviewed and validated data across 100+ organisations, applying structured quality checks and discrepancy investigation to improve the accuracy and consistency of analytical outputs. • Designed a repeatable reporting and validation workflow covering 25 source files, 12 reporting periods and 20 organisations, reducing hands-on reporting preparation by approximately 78%. • Analysed 4.3M customer sessions and 157,000 purchase sessions using SQL and Python, identifying 310,000+ high-intent lost sessions and translating findings into measurable experimentation opportunities. • Evaluated AI classifications across 300 manually validated cases from 28,000+ multilingual records, measuring model performance and identifying where automation was sufficiently reliable versus where human review was required.