Hui Kang Tong
Experience
Quora
Nov 2021 - Present
Machine Learning Engineer, San Francisco Bay Area
- Established the agent skills system for all internal developers to automate processes
- Maintains the CLAUDE.md and hooks for the company monorepo
- Built the internal agent to answer any data questions with the data lake
- Designs, implements and A/B tests changes for Quora feed and digest recommendations
- Built tools like funnel analysis to investigate any issues with retrieval and ranking algorithms
- Runs the product interview for content recommendation systems and AI engineering
- Shipped the generation of questions about recent events
- Wrote and evaluated prompts to label topics for content, and the pipeline to create new topics
- Languages: Python, prompt engineering, Trino/PrestoSQL, C++
- Technical domains: recommendation systems, large language models, AI engineering, A/B testing
Projects
AI Mathematical Olympiad
Published notebooks and annotation corpus for ongoing AIMO 3.
Previously participated in AIMO 1 (code, discussions) and AIMO 2 (code, writeup)
ARC-AGI-2
Crafted golden solutions and guided reinforcement learning with modified GRPO (writeup)
Konwinski Prize
Published the widely used baseline notebook. Ranked 7th on the public leaderboard
Meta AI Hacker Cup
Competed in Meta’s AI competitive programming challenge in 2024 (3rd place) and 2025
Automatic Prompt Engineering
Automated writing and optimizing classification prompts with a dashboard
LeetCode - peak rating 2992 (March 2022)
Codeforces - peak rating 2235 (July 2022)
Writing
Product - instruction delivery, principles for AI products, prompting projects
Proposals - multichannel prediction, supercommunity
Drawings - animated flash attention, decoder layer
AI Coding - mindset changes, what AI needs, how to improve
Education
Singapore University of Technology and Design
May 2017 - Aug 2021
- Bachelor of Engineering (Honours with Highest Distinction), GPA 4.61/5.00
Currently on H-1B. Also eligible for H-1B1 Singapore visa (no lottery, no 100k fee)