I'm a fourth-year CS Ph.D. at University of Wisconsin-Madison advised by Prof. Paraschos Koutris. He ushers me into the perpetual study of query optimization.

I earned my B.S. in Math from National University of Singapore. There, I had the privilege of being guided by Prof. Jonathan Scarlett on neural architectural search.

---

Publications (* - alphabetical authorship)

• Evaluating Datalog over Semirings: A Grounding-based Approach
  Hangdong Zhao, Shaleen Deep, Paraschos Koutris, Sudeepa Roy, Val Tannen
  PODS'24

• *Tight Bounds of Circuits for Sum-Product Queries
  Austen Fan, Paraschos Koutris, Hangdong Zhao
  PODS'24

• Predicate Transfer: Efficient Pre-Filtering on Multi-Join Queries
  Yifei Yang, Hangdong Zhao, Xiangyao Yu, Paraschos Koutris
  CIDR'24

• Conjunctive Queries with Negation and Aggregation: A Linear Time Characterization slides
  Hangdong Zhao, Austen Fan, Xiating Ouyang, Paraschos Koutris
  PODS'24

• *The Fine-Grained Complexity of Boolean Conjunctive Queries and Sum-Product Problems slides
  Austen Fan, Paraschos Koutris, Hangdong Zhao
  ICALP'23

• Space-Time Tradeoffs for Conjunctive Queries with Access Patterns slides
  Hangdong Zhao, Shaleen Deep, Paraschos Koutris
  PODS'23
  Distinguished Paper Award (invited to TODS)

• On Architecture Selection for Linear Inverse Problems with Untrained Neural Networks
  Yang Sun, Hangdong Zhao, Jonathan Scarlett
  Entropy, 23(11), 1481

---

Industrial Experience

• Microsoft Gray Systems Lab (Feb 2024 - Present)
  Research Assistant (w/ Venkatesh Emani)

---

Teaching Experience (TA)

• CS 577 Intro to Algorithms: Spring 2022 (Prof. Jin-yi Cai), Fall 2021 (Prof. Eric Bach)

• CS 544 Intro to Big Data Systems: Fall 2023 (Prof. Tyler R. Caraza-Harter)