Li Zheng
Data Science | Product | AI
SUMMARY
Data Scientist TL with 9+ years of experience shipping data-driven products from 0->1 and scaling to global audiences. Expertise in experimentation, causal inference, LLM/AI eval/integration, Search, measurement, and product growth.
Experience
Staff Data Scientist, Tech Lead
Meta (Instagram / Messenger) • Sep 2021 - Jan 2026
Led IG Search × MetaAI integration by enabling LLM-based query understanding and personalized ranking; drove the global launch of E2EE on Messenger by leading experiment design, GTM strategies, & capacity plannin . IG Search × MetaAI • E2EE
- 0→1: Set launch criteria and drove AI Search integration into Instagram.
- 1→100: Rebuilt the search stack end-to-end, driving 21% YoY growth in high-quality search volume.
- Built LLM eval and benchmark frameworks for quality, safety, and regressions, including human-in-the-loop annotation and prompt optimization.
- Designed a predictive demand and capacity framework that informed company investment decisions and unblocked IG AI Search launch.
- Led a cross-functional analytics team improving IG Search quality and enabling MetaAI features like summarization and content recognition.
- Drove launch go/no-go decisions through experiment design, metric definition, rollout planning, and causal analysis.
- Built custom A/B frameworks for cluster and network experiments that later became an org standard.
- Set roadmap priorities from user friction, opportunity sizing, and experimentation/holdout signals, and supported DS and engineering hiring.
Co-Founder
Flat Strategy • Mar 2025 - Present
Providing homebuyers with a simple, transparent, and low-cost experience, while empowering realtors with AI agents that automate lead conversion and ensure effortless transaction compliance. Check us out!
Senior Associate, Data & Analytics Insights
PwC • Jun 2018 - Sep 2021
Led top banks developing measurable insights, testing and implementing new ideas, mitigating risks, and reducing frictions through advanced quantitative analytics.
- Led analytics engagements for major banks to test/implement new ideas, mitigate risk, and reduce operational friction through quantitative modeling
- Developed and tuned financial risk models and classifiers; ran hypothesis testing and monitoring, saving 100+ hours/week in manual review
- Built an NLP transaction screening system in Python (spaCy, scikit-learn, TensorFlow) and supported deployment across multiple clients
Summer Data Analyst
Duke Health • Mar 2018 - Jun 2018
Optimized fraudulent identification workflow for one of the largest hospital groups in North America, reducing false positive rate from 37% to less than 10%.
- Designed and implemented fraud and anomalies detection workflow
- Built ETL data pipelines, performed DQ analysis, and drafted data dictionaries
Data Analyst
HER Realtors • Aug 2015 - Dec 2016
Developed a real estate price prediction and recommendation system to help investor clients, leading to $5.3M combined deals.
- Delivered model outputs via Tableau dashboards and iterated models/features with stakeholders
- Built and trained machine learning models based on past transaction data
Education
M.S., Data Science (Financial Fraud Analytics)
Duke University • 2017 - 2018
B.S., Accounting & MIS
The Ohio State University • 2012 - 2016
Activity
Private Pilot License (PPL)
FAA • #3877290
Li Zheng
Li Zheng
Data Science | Product | AI
SUMMARY
Data Scientist TL with 9+ years of experience shipping data-driven products from 0->1 and scaling to global audiences. Expertise in experimentation, causal inference, LLM/AI eval/integration, Search, measurement, and product growth.
Experience
Staff Data Scientist, Tech Lead
Meta (Instagram / Messenger) • Sep 2021 - Jan 2026
Led IG Search × MetaAI integration by enabling LLM-based query understanding and personalized ranking; drove the global launch of E2EE on Messenger by leading experiment design, GTM strategies, & capacity plannin . IG Search × MetaAI • E2EE
- 0→1: Set launch criteria and drove AI Search integration into Instagram.
- 1→100: Rebuilt the search stack end-to-end, driving 21% YoY growth in high-quality search volume.
- Built LLM eval and benchmark frameworks for quality, safety, and regressions, including human-in-the-loop annotation and prompt optimization.
- Designed a predictive demand and capacity framework that informed company investment decisions and unblocked IG AI Search launch.
- Led a cross-functional analytics team improving IG Search quality and enabling MetaAI features like summarization and content recognition.
- Drove launch go/no-go decisions through experiment design, metric definition, rollout planning, and causal analysis.
- Built custom A/B frameworks for cluster and network experiments that later became an org standard.
- Set roadmap priorities from user friction, opportunity sizing, and experimentation/holdout signals, and supported DS and engineering hiring.
Co-Founder
Flat Strategy • Mar 2025 - Present
Providing homebuyers with a simple, transparent, and low-cost experience, while empowering realtors with AI agents that automate lead conversion and ensure effortless transaction compliance. Check us out!
Senior Associate, Data & Analytics Insights
PwC • Jun 2018 - Sep 2021
Led top banks developing measurable insights, testing and implementing new ideas, mitigating risks, and reducing frictions through advanced quantitative analytics.
- Led analytics engagements for major banks to test/implement new ideas, mitigate risk, and reduce operational friction through quantitative modeling
- Developed and tuned financial risk models and classifiers; ran hypothesis testing and monitoring, saving 100+ hours/week in manual review
- Built an NLP transaction screening system in Python (spaCy, scikit-learn, TensorFlow) and supported deployment across multiple clients
Summer Data Analyst
Duke Health • Mar 2018 - Jun 2018
Optimized fraudulent identification workflow for one of the largest hospital groups in North America, reducing false positive rate from 37% to less than 10%.
- Designed and implemented fraud and anomalies detection workflow
- Built ETL data pipelines, performed DQ analysis, and drafted data dictionaries
Data Analyst
HER Realtors • Aug 2015 - Dec 2016
Developed a real estate price prediction and recommendation system to help investor clients, leading to $5.3M combined deals.
- Delivered model outputs via Tableau dashboards and iterated models/features with stakeholders
- Built and trained machine learning models based on past transaction data
Education
M.S., Data Science (Financial Fraud Analytics)
Duke University • 2017 - 2018
B.S., Accounting & MIS
The Ohio State University • 2012 - 2016
Activity
Private Pilot License (PPL)
FAA • #3877290
Projects
Also available as a Claude Code skill
Data science tool for designing and running statistical experiments
Metrics creation, management, and reporting platform with native AI integration evolved from Meta's internal toolkit: QE, Deltoid, and M360
Modern home buying experience with reduced cost through flat-fee transaction services
AI-powered financial intelligence dashboard that uses LLMs and real-time data to run modular analyses
iOS game featuring AI opponent and local multiplayer
Minimalist productivity timer for focused work sessions