Projects

Featured Projects (3)

LangGraph AI Research Agent

Full-stack AI research assistant with React, FastAPI, and LangGraph, supporting LLM-powered query rewriting, Google Search integration, and real-time streaming via Redis.

Built a full-stack AI research assistant with a React frontend and FastAPI backend.
Implemented a LangGraph-powered LLM agent for query rewriting and iterative web research.
Integrated Google Search APIs for knowledge-gap analysis and citation-rich answers.
Used Redis pub/sub for real-time streaming and Postgres for conversation persistence.

React FastAPI LangGraph Redis PostgreSQL

SmartCoupon Engine

High-concurrency coupon system in Java/Spring Boot with Kafka, Redis, and MySQL. Supports scalable template creation and real-time redemption for millions of users.

Developed a high-concurrency coupon system serving millions of users.
Supported coupon template creation, scheduled delivery, and real-time redemption.
Processed million-row Excel tasks with EasyExcel and Redisson delay queues.
Applied Redis Bloom filters to reduce latency and prevent cache breakdown.
Ensured consistency and idempotency with MySQL row locks and Kafka retries.

Java Spring Boot Kafka Redis MySQL EasyExcel

GitHub

PII Detection Pipeline

Hybrid CRF + Transformer NER workflow for detecting PII in 22K MOOC essays. Fine-tuned BERT/DeBERTa models, achieving Fβ=0.92 with high precision and recall.

Built a hybrid CRF + Transformer NER pipeline for detecting PII in 22K MOOC essays.
Fine-tuned BERT and DeBERTa models, achieving Fβ=0.92 with high precision and recall.
Applied LLM-based data augmentation (Mistral) to improve robustness and balance classes.

Python BERT DeBERTa CRF Scikit-learn Pandas

GitHub

Open Source Contributions (1)

LightRAG

Implemented pgvector indexing (HNSW/IVFFLAT) and query optimization for large-scale vector retrieval, adopted in ticketing recommendation with 10k+ items.

Implemented pgvector indexing (HNSW/IVFFLAT) and auto-indexing on core VDB tables.
Rewrote vector-retrieval SQL (EXPLAIN-driven) to ensure index-backed execution plans.
Unified query interfaces across backends; improved maintainability on large corpora.
Adopted for ticketing recommendation (10k+ items) with pgvector HNSW.

View Contribution

Other Projects (2)

Portfolio Website

Personal portfolio built with Hexo and custom styling, showcasing projects, blogs, and open-source contributions.

Hexo Stylus JavaScript

Live Demo GitHub

Unity 2D Platformer Game

Developed and implemented a color-switching mechanic that governs interaction with platforms, enemies, and obstacles to add strategic depth.
Designed and optimized multiple levels; introduced a checkpoint system and a color-gun mechanic to enhance user experience.
Fixed critical bugs, optimized performance, and iterated level design based on extensive playtesting feedback.

Unity C# 2D Game Development