Ywuan Chai (YC) Chong
Christchurch,CAN
Summary
Senior Machine Learning Engineer with 5.5 years of experience specializing in system architecture and MLOps. Recognized for strong problem-solving capabilities, including the successful implementation of comprehensive monitoring pipelines and delivering impactful Generative AI solutions. Proven ability to optimize infrastructure costs and lead technical initiatives in high-scale environments.
Overview
5
5
years of professional experience
Work History
Senior Machine Learning Software Engineer II
Appier Inc.
Taipei City, Taiwan
04.2025 - 01.2026
- Led team as Technical Cost Lead, driving infrastructure optimization initiatives that achieved 15% reduction in cloud computing expenses.
- Architected team’s Service Reliability (SRE) framework and developed LLM evaluation service, creating end-to-end monitoring pipelines to enhance observability and maintain Generative AI model quality.
Senior Machine Learning Software Engineer
Appier Inc.
Taipei City, Taiwan
08.2022 - 04.2025
- Architected and productized the BotBonnie Campaign User Segment (AI Click) model from scratch, deploying it to 10+ clients and achieving a 22% performance uplift by accurately predicting high-intent users.
- Spearheaded MLOps for AiDeal product, aligning data science and engineering teams to ensure consistent model performance and production stability.
- Orchestrated migration of AiDeal’s machine learning infrastructure from AWS to Google Cloud Platform (GCP), achieving 30% reduction in cloud costs.
- Developed Retrieval-Augmented Generation (RAG) Knowledge Bot, onboarding 8+ enterprise clients, including Moderna, Inc.
Machine Learning Software Engineer
Appier Inc.
Taipei City, Taiwan
08.2020 - 08.2022
- Led the Multi-Armed Bandit (MAB) optimization project across 10+ clients, achieving an 8% performance uplift through dynamic model selection.
- Developed inaugural recommendation model, deployed to 50+ clients, supporting daily traffic of over 10 million users.
- Designed online experiments to evaluate performance of various recommendation models, informing future development.
- Researched emerging technologies to advance machine learning capabilities, driving innovation at Appier Inc.
Education
Master of Science - Computer Science
National Taiwan University
Taipei, TW06-2020
Bachelor of Science - Compute Science
National Tsing Hua University
Hsinchu, TW06-2018
Skills
- Software development
- Machine learning
- LLM development
- AI strategy development
- Team collaboration
- Cross-functional collaboration
- Performance optimization
- System architecture
- Microservices architecture
- Cloud computing platforms
- MLOps implementation
- Problem solving
- Git version control
Timeline
Senior Machine Learning Software Engineer II
Appier Inc.
04.2025 - 01.2026
Senior Machine Learning Software Engineer
Appier Inc.
08.2022 - 04.2025
Machine Learning Software Engineer
Appier Inc.
08.2020 - 08.2022
Master of Science - Computer Science
National Taiwan University
Bachelor of Science - Compute Science
National Tsing Hua University