# Wistan Chou

> Software Engineer @ Citadel

Location: New York, New York, United States
Profile: https://flows.cv/wistan

## Work Experience
### Software Engineer @ Citadel
Jan 2024 – Present | New York City Metropolitan Area

### Principal Software Engineer, Data @ Lev
Jan 2023 – Jan 2024 | New York City Metropolitan Area
- Designed and built all data infrastructure (ingestion, warehousing, transformations, BI), core search stack and matching algorithm (entity resolution, indexing, retrieval, ranking)
- Designed and built AI service powering all platform AI features including document extraction, knowledge base construction, and deal book generation
- Led all data science and ML work (3p data evaluations, analysis of platform/domain data, forecasting)

### Staff Software Engineer, Engineering Manager @ Lev
Jan 2022 – Jan 2023 | New York City Metropolitan Area

### Senior Machine Learning Engineer @ Lev
Jan 2021 – Jan 2022 | New York City Metropolitan Area

### Senior Software Engineer @ Salesforce
Jan 2021 – Jan 2021
- Designed and implemented a change capture system that records high-risk sensitive changes to production instances and customer data
- Led cross-team effort to propose and introduce new SQL concepts and syntax to Salesforce's variant of PostgreSQL
- Worked on HSM-backed production secret-sharing system
- Built large scale change and access systems to deploy changes to production

### Software Engineer @ Salesforce
Jan 2020 – Jan 2021 | San Francisco Bay Area

### Associate Software Engineer @ Salesforce
Jan 2019 – Jan 2020 | San Francisco Bay Area

### Summer Intern @ Salesforce
Jan 2018 – Jan 2018 | San Francisco Bay Area
- Worked on machine learning models in the Search Ranking team within Salesforce Search Relevance
- Created query-independent global search re-ranking model using sparse MRU affinity features that scaled Salesforce’s personalized search from 10 to 500 organizations
- Leveraged NLP to build query-specific models based on named entities
- Worked on feature linearization using rc-splines and discovering significant first-order feature interactions
- Worked on using adversarial learning for cross-organization regularization for search re-ranking


## Education
### Bachelor’s Degree in Mathematics and Computer Science
Swarthmore College

### Visiting Student in Computer Science and Mathematics
University of Oxford

### High School in IB Bilingual Diploma
International School of Beijing


## Contact & Social
- LinkedIn: https://linkedin.com/in/wistan-chou

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Source: https://flows.cv/wistan
JSON Resume: https://flows.cv/wistan/resume.json
Last updated: 2026-04-05