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Pei-Ju (Pj) Sung Email & Phone Number

Software Engineer, Machine Learning at Meta

Location: San Francisco Bay Area, United States 5 work roles 3 schools

1 work email found @sofi.com 1 phone found area 607 LinkedIn matched

✓ Verified Jul 2026 4 data sources Profile completeness 100%

Current company

Who is Pei-Ju (Pj) Sung? Overview

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Quick answer

Pei-Ju (Pj) Sung is listed as Software Engineer, Machine Learning at Meta, a with 1 employees, based in San Francisco Bay Area, United States. AeroLeads shows a work email signal at sofi.com, phone signal with area code 607, and a matched LinkedIn profile for Pei-Ju (Pj) Sung.

Pei-Ju (Pj) Sung previously worked as Staff Data Scientist - Machine Learning at Sofi and Director, Model Risk Management at Visa. Pei-Ju (Pj) Sung holds Doctor Of Philosophy (Ph.D.), Applied Economics from Western Michigan University.

Company email context

Email format at Meta

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{first_initial}{last}@sofi.com

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AeroLeads found 1 current-domain work email signal for Pei-Ju (Pj) Sung. Compare company email patterns before reaching out.

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Profile bio

About Pei-Ju (Pj) Sung

• Ph.D in Economics with 8+ years of industry experience in data science, predictive analytics, and machine learning• Experienced in using big data tools (Python, SQL, Hadoop, AWS) to develop and deploy end-to-end ML models• Leveraged ML models, experimental design, and data visualization to drive business performance and revenue growth• Strong ability to collaborate with cross-functional teams and communicate complex data solutions to senior stakeholders

Listed skills include Statistics, Data Analysis, Econometrics, Stata, and 36 others.

Current workplace

Pei-Ju (Pj) Sung's current company

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Pei-Ju (Pj) Sung work experience

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Software Engineer, Machine Learning

Staff Data Scientist - Machine Learning

Sofi

San Francisco, California, Us

• Developed machine learning models (LightGBM, LSTM, neural network) for loan payments/delinquencies with over 20MM records and 2K attributes. After deployment in Feb. 2023, the model achieved 11% AUC improvement over previous versions, driving $5MM revenue increase within the first 3 months• Designed A/B tests, define performance metrics, and estimate the impacts for collection strategies. Increased the right person contact (RPC) rate by 35% and and promise-to-pay (PTP) rate by 20%• Developed tools and metrics for loss forecast, improving the annual forecast accuracy (MSE) by 34%• Communicated actionable insights for improving collection strategies to senior stakeholders (senior director/VP level)• Tools/frameworks: Python/Jupyter, TensorFlow, Keras, scikit-learn, NumPy, Pandas, matplotlib, SQL, AWS, git

Director, Model Risk Management

Visa

Foster City, California, Us

• Built fraud detection ML models (LightGBM, RNN) to challenge and improve the models in production, processing sample size of over 300MM transactions and 150 attributes using Hadoop• Collaborated with cross-functional team on improving internal machine learning platform for validation team• Communicated key findings to cross-functional stakeholders and corporate executives (SVP level)• Tools/frameworks: Python/Jupyter, TensorFlow, Keras, scikit-learn, NumPy, Pandas, matplotlib, SQL, git, Hadoop

Feb 2020 - Mar 2021

Senior Data Scientist - Credit Risk Strategy

Sofi

San Francisco, California, Us

• Built data-driven credit strategies through exploratory analyses and data visualization• Developed key performance metrics and dashboards in Tableau to monitor and visualize strategy impacts• Communicated key findings to cross-functional stakeholders and company C-suite executives• Evaluated opportunity and risk for new student loan products through data analysis on Experian Sandbox data (years of credit data on 245MM consumers) using Python and Hadoop• Tools/frameworks: Tableau, Python/Jupyter, scikit-learn, NumPy, Pandas, matplotlib, SQL, git, Hadoop

Nov 2018 - Jan 2020

Model Validation Analyst, Avp

Bank Of The West

Chicago, Illinois, Us

• Identified sources of model risk and conducted effective challenges to models • Presented key findings and responded to ad-hoc questions from stakeholders and government regulatory agencies• Models validated: ALLL models (FAS114 Impairment Calculation), IFRS9, CCAR models (C&I PD/LGD), PPNR (Prepayment, New volume, Utilization), BSA/AML models (KYC), Scorecards (Auto, SFR, Credit Card)• Received Risk Recognition Award for work excellence in 2018Q3• Tools: SAS, Python, NumPy, Pandas, matplotlib, scikit-learn, time series model, logistic regression, loss forecast

Apr 2016 - Nov 2018

Team & coworkers

Colleagues at Meta

Other employees you can reach at sofi.com. View company contacts for 1 employees →

SS

Sameer Sofi Colleague at MetaJammu & Kashmir, India View → H(

Hyongseok (Joseph) Oh Colleague at MetaSeattle, Washington, United States View → AD

Amanda Dougherty Colleague at MetaSan Francisco, California, United States View → MN

Miranda Needham Colleague at MetaHelena, Montana, United States View → JS

Justin Slesinger Colleague at MetaNew Castle, Delaware, United States View → IG

Imevbore Gabriel Colleague at MetaNigeria View → RA

Rosa Alfonso-Mcgoldrick Colleague at MetaBrooklyn, New York, United States View → JJ

Jenna Jackson Colleague at MetaUnited States View → YS

Yailis Sosa Vázquez Colleague at MetaMontevideo, Uruguay View → JT

Jacoba Taylor Colleague at MetaSalt Lake City, Utah, United States View →

3 education records

Pei-Ju (Pj) Sung education

Doctor Of Philosophy (Ph.D.), Applied Economics

Western Michigan University

Master’S Degree, Economics

San Diego State University

Bachelor’S Degree, Sociology

National Taipei University

FAQ

Frequently asked questions about Pei-Ju (Pj) Sung

Quick answers generated from the profile data available on this page.

What company does Pei-Ju (Pj) Sung work for?

Pei-Ju (Pj) Sung works for Meta.

What is Pei-Ju (Pj) Sung's role at Meta?

Pei-Ju (Pj) Sung is listed as Software Engineer, Machine Learning at Meta.

What is Pei-Ju (Pj) Sung's email address?

AeroLeads has found 1 work email signal at @sofi.com for Pei-Ju (Pj) Sung at Meta.

What is Pei-Ju (Pj) Sung's phone number?

AeroLeads has found 1 phone signal(s) with area code 607 for Pei-Ju (Pj) Sung at Meta.

Where is Pei-Ju (Pj) Sung based?

Pei-Ju (Pj) Sung is based in San Francisco Bay Area, United States while working with Meta.

What companies has Pei-Ju (Pj) Sung worked for?

Pei-Ju (Pj) Sung has worked for Meta, Sofi, Visa, and Bank Of The West.

Who are Pei-Ju (Pj) Sung's colleagues at Meta?

Pei-Ju (Pj) Sung's colleagues at Meta include Sameer Sofi, Hyongseok (Joseph) Oh, Amanda Dougherty, Miranda Needham, and Justin Slesinger.

How can I contact Pei-Ju (Pj) Sung?

You can use AeroLeads to view verified contact signals for Pei-Ju (Pj) Sung at Meta, including work email, phone, and LinkedIn data when available.

What schools did Pei-Ju (Pj) Sung attend?

Pei-Ju (Pj) Sung holds Doctor Of Philosophy (Ph.D.), Applied Economics from Western Michigan University.

What skills is Pei-Ju (Pj) Sung known for?

Pei-Ju (Pj) Sung is listed with skills including Statistics, Data Analysis, Econometrics, Stata, Sas, R, Regression Analysis, and Time Series Analysis.

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