Chang Su is a Software Engineering Manager in San Francisco with 12 years of experience building and scaling machine learning and recommendation systems across consumer ads and commerce. He has led ML teams at Meta/Instagram/Facebook focused on ads quality, Stories ranking, LLM post-training, and agent evaluation frameworks, translating research-grade models into production at scale. Earlier roles at Twitter and Amazon honed his expertise in observability, high-throughput payments, and content discovery systems, while a Ph.D. in machine learning and information retrieval anchors his technical depth. He combines hands-on modeling and systems thinking with people leadership, driving cross-functional impact from core ranking algorithms to evaluation pipelines. A habit of moving between research and production gives him a rare fluency in both experimental ML and robust engineering delivery.
12 years of coding experience
19 years of employment as a software developer
Master Computer Science, Master Computer Science at Nanjing University
Ph.D. Machine Learning Information Retrieval, Ph.D. Machine Learning Information Retrieval at University at Buffalo
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