Wally Chang
Timeline

The long view, by date.

Every entry the homepage Bento draws from — projects, roles, races, coursework, milestones — sorted newest to oldest.

16 entries · Summer 2022May 2026
Fall 2025 →
Role · founder
May 2025 →
Role · current
PricingCausal inferenceBayesianSQL

Data Scientist at Extend

Pricing and risk models for extended warranties, deployed across Peloton, Oura Ring, Sonos, Michaels, and Advance Auto Parts. $600K+ in incremental net revenue from pricing and term optimizations. Behavioral-economics-shaped test design; Bayesian, frequentist, and quasi-experimental evaluation.

Aug 2024 — May 2025
Role
PECybersecurityInternal tools

Private Equity Analyst at Carrick Capital Partners

Covered cybersecurity and GRC. Built an internal tool that ranks investment prospects from market maps; analysts used it to prioritize sourcing and it set up three meetings at the RSA Conference. Cut analysis time by roughly 80%.

May 2024
milestone
CornellMPS

MPS Data Science, Cornell Bowers CIS — graduated, 3.99 GPA

One-year Master’s after the BS. The interesting work was AmEx ML research and the financial-crisis risk project; the rest was the rigor that lets you read a paper without bluffing.

Apr 2024
Coursework · STSCI 5610
RRisk modelingCAPM

Re-pricing two bank stocks through the 2008 crisis

Rolling-window CAPM in R: alpha, beta, and statistical tests of market-relative performance for Goldman Sachs and JPMorgan through the worst of 2008. The fun was watching beta of an investment bank go from "diversifiable" to "the entire market is the bank" in three months.

Feb — May 2024
Research · led 8 engineers
ML researchHDBSCANLSTMNLP

AmEx — label-noise mitigation for transformer support-ticket routing

A research-literature-driven pipeline that combined HDBSCAN, Louvain community detection, and an LSTM to find and correct mislabeled training data in a multiclass transformer. Reduced high-confidence misclassifications in production routing; I led the eight-person team.

Dec 2023
milestone
CornellBS

BS Information Science, Cornell CALS — magna cum laude, 3.88 GPA

Information Science with a Business minor. Independent research in text mining; a lot of late nights in Gates Hall.

Fall 2023
Coursework · INFO 6350
NLPClusteringData wrangling

Text-mining the American film canon — 359 movie subtitle files

For Text Mining History and Literature, I scraped and processed 359 movie .srt files and ran clustering + sentiment analysis on the corpus. Most of the project was cleaning subtitle files into something the analysis could actually trust.

Fall 2023
Independent research · INFO 4900
BERTNewsletter scrapingSentiment analysis

BERT-based date prediction on a corpus of Morning Brew newsletters

Scraped two years of Morning Brew, hand-rolled the dataset, and fine-tuned BERT to predict newsletter date from sentiment and topical features. Mostly an excuse to learn what fine-tuning actually feels like at small scale.

Summer 2023
Role · intern
PEModeling

Private Equity Intern at Carrick Capital Partners

First exposure to software investing. Financial modeling, market research, expert calls. Got asked back full-time the following year.

Summer 2022
Role · consulting intern
ConsultingOperations

PwC — operational strategy for CareerVillage

Helped CareerVillage improve student-question to professional-response matching efficiency. Side quest: led a team to 2nd place out of 70+ in PwC’s firmwide consulting case competition, presenting to a Partner panel.