Leo L.

About Leo L.

Experienced data professional with a strong background in machine learning and data science. Fluent in Python, SQL, Tableau, R, Excel. Highly experienced with cross functional collaboration, excellent communication skills, frequent executive level presentations.Email: l••••••••@gmail.com

Experience

1. Data Engnineer Ii

   Amazon

   Jul 2024 — Present · New York, NY, US

   Built and productionized large-scale ETL pipelines processing billions of Alexa utterance-level records and aggregated metrics, while owning data modeling, dataset onboarding and storage, and Airflow orchestration. Supported 30+ organizations in executive decision alignment, customer experience improvement, and company wide data-driven strategies.• Led feature enhancements for production Python packages supporting MAU, strengthened automated testing, and took full ownership of build, test, and deployment lifecycles using Amazon’s internal release systems. Drove the transition of release ownership from Software Engineering team to Data Engineering team, supported live systems through incident response, and coached engineers on package deployment and operational support.• Served as a trusted escalation point during on-call rotations for time-sensitive, high-impact operational decisions, resolving Severity 2 incidents, mitigating operational risks, unblocking delayed pipelines, and addressing urgent ad hoc customer data requests.

Education

• University of Virginia

  Master's degree, Data Science

• UCLA

  Bachelor's degree, Applied Mathematics

Skills

• Sas Programming
• Information Technology
• Tableau
• Python
• Data Analysis
• R
• Project Management
• Search Engine Marketing (Sem)
• Natural Language Processing
• Public Speaking
• Customer Service
• Leadership
• Html
• Data Science
• Sql
• Sas
• Data Analytics
• Microsoft Office
• Powerpoint
• Microsoft Excel
• Microsoft Word
• Management
• Predictive Modeling
• Research