# HeeDong Jung

> Staff Software Engineer at SoFi

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/heedong

• Software engineer interested in both back-end and big data processing, machine learning using  MapReduce, Spark and other technologies related to Big Data frameworks.
• Passionate in learning new technologies as well as improving skills in current technologies. 
• Programming Languages: JAVA, Scala, SQL
• Open Source Frameworks: Hadoop Map Reduce, Oozie, Spark, Hive, Kafka
• Unix Shell, C#, C++, Python

## Work Experience
### Staff Software Engineer @ SoFi
Jan 2021 – Present

### Senior Software Engineer @ LinkedIn
Jan 2019 – Jan 2021 | San Francisco Bay Area
Integrating Drawbridge Identity Product to LinkedIn's Marketing Solutions

### Senior Software Engineer and Manager @ Drawbridge Inc.
Jan 2018 – Jan 2019 | San Mateo, CA
Scala/Spark Engineer
- Re-designed, Implemented and Maintained Data Ingestion and Aggregation Pipelines (Experian, Hashed IP Address)
- Oversaw New Data Ingestion Projects (Hashed IP Address, LiveRamp)
- Improved robustness and stability of Data Ingestion Pipeline
- Helped the team to transition to new tech stack (Spark/Scala) and product (Identity Solution)

### Engineering Manager, Ad-Serving @ Drawbridge Inc.
Jan 2015 – Jan 2018 | San Mateo, CA
- Mentored and managed the team to have good practices and processes, reduce bugs, perform rigorous and thorough testing
- Improved Online Server Performance by 1.5x while Maintaining Average Response Time under 200ms
- Oversaw Various Online Ad Server Projects including Geo Ad Targeting, Weather Targeting, Fraud Detection
- Reviewed design and implementations on various other online server projects
- Documented Online Ad Server Architecture as part of Ad Service Shutdown

### Tech Lead, Online Platform @ Drawbridge Inc.
Jan 2013 – Jan 2015 | San Mateo, CA
- Designed Real-time Spend Tracking System, Bid Filter System, Multi-Currency Support
- Implemented Ad Serving features including Video Ad Support, Ad Choices Integration for Privacy, Bidding Optimization, Cost-based Budget System, Weather Targeting, etc.
- Integrated Kafka framework for Online Server Log Processing
- Designed and developed Drawbridge Cross Device Platform (Marketplace)
- Mentored and led junior engineers in the team
- Go-to person for online server issue tracking, supported ad-operations team to resolve issues

### Software Engineer @ Drawbridge Inc.
Jan 2012 – Jan 2013 | San Mateo, CA
- Implementation of various realtime ad server features including Ad Targeting (Carrier, Device Make/Model), Budget Management System, Ad Campaign Optimization Support, Realtime Bidding Model Integration, User Opt-out System.
- New Partner Integrations, Upgrades of Current Integrations
- New Endpoints for Bulk Data Ingestion.
- Support Ad-Operations Team to resolve any issues related to ad campaign operations

### Technical Yahoo, Software Development Engineer, Intermediate @ Yahoo!
Jan 2011 – Jan 2012 | Sunnyvale, CA
• Member of User Understanding Services team under Knowledge and Personalization Group that focused on gathering information about users and understanding them in order to deliver personalized experiences

• Created a new webpage to automate on-boarding process of new customers who want to utilize the data on grid

• Contributed to ingestion and modeling components for transferring Yahoo address book data onto grid using Hadoop

• Working on ingestion and modeling Facebook page data that are liked by Yahoo-Facebook connected users onto grid in order to help extract the users’ interests for personalization

• Working on generating list of users who chose to opt-out from Yahoo Social Chrome experience on grid

### Research Assistant @ University of Illinois at Urbana-Champaign
Jan 2009 – Jan 2011
Research Assistant in Illinois Security Lab.

Participated Projects:
1. Building Automation Middleware (Aug 2010 - May 2011)
• Provided a web access to building control network without compromising security in multi-tier system

2. Unified Headend Interface for Smart Grid Applications (Mar 2010 - Nov 2010)
• Designed Unified Headend Interface Architecture Model
• Implemented a prototype using Windows Communication Foundation and C#

### Teaching Assistant for CS105 - Introduction to Computing with Application to Business and Commerce @ University of Illinois at Urbana-Champaign
Jan 2008 – Jan 2009
• Taught two hours and assisted one hour of lab sessions per week (40 students)
• Created programming assignments and exam questions


## Education
### MS in Computer Science
University of Illinois Urbana-Champaign

### Bachelor of Science (BS) in Computer Science and Engineering
Seoul National University


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

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Source: https://flows.cv/heedong
JSON Resume: https://flows.cv/heedong/resume.json
Last updated: 2026-04-12