James Pak Email & Phone Number

Seoul, Seoul, KR

• Search Ranking
• Optimize search ranking/reranking models
• Drive LLM-based text embedding model
• Lead the ranking model online/offline metric dashboard

Los Angeles, California, US

• Global Monetization, Ads Core Ranking
• Optimized two-tower based users & ads representation model and research the state-of-the-art users & ads representation model
• Improved early-stage pre-ranking model by leveraging the late-stage ranking models with knowledge distillation
• Published ads embedding in real-time manner
• Designed and implemented ecpm-based premium user clustering algorithm

Redmond, Washington, US

• News & Feeds, Growth Ranking Team
• Fine-tuned the state-of-the-art GPT-based LLM to strengthen a self-attention-based two tower user & news model
• Built a series of the training data pipelines to explore and enrich high quality features for the user & news model
• Designed and implemented position de-biased click model to reduce position bias to the training data
• Designed and implemented Thompson Sampling-based exploration and exploitation method to enrich content diversity
• Improved the traffic control mechanism to support a healthy and growing content partner ecosystem

Armonk, New York, NY, US

• IBM Watson Machine Learning
• Implemented the system capacity planning calculator based on machine learning technology
• Led JPMorgan Chase customer churn detection project based on 13M business banking customers
• Improved the existing keyword extraction model by 20% by various NLP technics
• Designed an anomaly detector to predict issues on DB2 before they arise by using machine learning model

Pasadena, CA, US

• Designed and implemented a dance generator from songs by Machine Learning Model
• Researched 3D human pose estimation and 3D full body reconstruction based on deep learning model
• Reduced errors by 12% at 3D human pose estimation task as compared to the current state-of-the-art model

Los Angeles, CA, US

• Worked on back-end development and natural language processing for a financial services project at Dreamtek Industries through the USC Center for Systems and Software Engineering.
• Implemented back-end features to optimize financial services selection and create a true banking API
• Contributed to POS and BIO tagger using CRF and product matching & ranking algorithms

Los Angeles, CA, US

• Designed Sentiment analyzer which has 91.5% accuracy using hybrid CNN+LSTM model with bi-gram.
• Developed Anomaly Detector based on earning conference call log, which uses GRU+Attention model with gradient-clipping and coverage.

Suwon-Si, Gyeonggi-Do, KR

• Designed the 64Bit Multi-Core Operating System prototype that increases performance by 50% of context switching speed
• Handpicked member for core development team that focused on multitasking & multithreading, device drivers, code reviews, and end-to-end integration
• Created a Bitcoin mining application on our OS and Ubuntu

• Program: Best of Best Program
• Acted as project manager to create the Automatic Secure Coding Verification Tool for Android Apps that detects hazardous source code by utilizing approximately 100 rules
• Discovered critical vulnerabilities in numerous Android Apps including bank related Apps
• Designed the Java Source Code Parser
• Published the open source project named "Orroid" at Github

Master'S Degree, Computer Science

Certificate, English Language Program

Bachelor'S Degree, Computer Science