About

Zhexiang (Bruce) Li

I work on machine learning and systems, and I like turning research prototypes into usable products.

I studied computer science at USC and start the UCLA M.S. in Computer Science in Fall 2026. In summer 2026, I worked on recommendation systems and edge AI at PMAOS while completing two paper submissions.

ML researchsystemsproduct engineering

Applied ML internship

PMAOS / Next Big Seek

AI Engineer Intern. My main work was algorithm design for recommendation and multimodal inference under tight device constraints: structured interest propagation, multi-horizon diversity control, evidence-aware fusion, and fixed-point decisions that can abstain. A smaller research track covered millirobot screening and experiment design.

REC

Diversity-aware recommendation

I designed recommendation logic that propagates preference signals in both directions between users and videos. The system keeps learned preference, retrieval scores, and diversity annotations separate, then allocates exposure across session, bridge, and long-term interest budgets. Fatigue controls reduce repetition without removing exploration.

Interest scales
3 horizons
Signal flow
User ↔ video
Validation
629 tests
EDGE

Evidence-aware multimodal inference

I designed an audio-visual affect pipeline for 11 languages. It rejects misaligned audio–video pairs, applies speech PAD, and fuses the remaining evidence before a quantized Q15 decision layer. The final decision can abstain or expose conflicting modalities instead of forcing a label.

Languages
11
Fusion
Audio + vision
Decision
Q15 · abstains
ROBOT

Millirobot research planning

I compared untethered piezoelectric robot designs under 10 mm and selected a 9 mm four-channel candidate for further testing. I then designed a PZT–steel cantilever bench experiment with pass/fail criteria. The internship ended before procurement or prototype fabrication.

Papers and lab work

Research

2024–26

MedTokenBudget: Lesion-Preserving Token Routing for Dermoscopic Image Classification

The paper adds a supervised router after the vision backbone to classify skin lesions with fewer tokens. Training constrains lesion retention, token budget, and routing diversity; the evaluation checks which lesion evidence remains on ISIC 2019.

Mass-Conservation Token Transformers for Auditable MS/MS Spectrum Retrieval

The method encodes mass-conserving fragment pairs as sparse tokens before spectrum retrieval. Hard negatives and witness-removal tests check whether the exported evidence changes the ranking.

Efficient Attention via Pre-Scoring

Selected informative key intervals before attention, implemented the method in Triton, and benchmarked it against HyperAttention and LevAttention.

arXiv:2505.11040

Machine Learning for Antiviral Drug Discovery

Built reproducible RDKit, Chemprop, and hybrid-model benchmarks across seven Therapeutics Data Commons datasets, followed by feature-importance and SHAP analysis.

Personal projects

Selected projects

Product engineering
A

Fridge Manager

I built Fridge Manager with Next.js and Supabase. It uses current inventory, leftovers, recipes, dietary preferences, and available time to plan meals and grocery purchases.

howtoeat.food
B

AI Doctor WeChat

This project connects a WeChat Mini Program, a browser workspace, knowledge retrieval, and FastAPI services for clinical and teaching workflows.

C

AI Business Card Hub

I built this iOS app to turn business-card photos into searchable bilingual records. It uses vision parsing first and falls back to OCR when needed.

Source code

Previous roles

Experience

Full record

CrAIg Capital Co-Founder & CTO

Led an AI-assisted housing debt-collection product, including data pipelines, workflow automation, product roadmap, and engineering delivery.

Terlingua Threads Full-Stack Engineer

Built Shopify-connected pages and Google Maps features; improved responsive behavior, ADA accessibility, SEO, and maintainability.

Piezolab Medical AI Engineer Intern

Built an LLM-assisted analysis pipeline for 5,000+ medical-malpractice documents and wrote laboratory workflow checks.

Hangzhou Haoan Jianke Technology Co., Ltd. Business Development Intern

Gathered requirements for an internal medical-device platform and helped structure the program and hiring needs.

GUDU Medical Investment Analyst Intern

Support MedTech deal screening, market research, due diligence, financial modeling, and valuation.

Synaptics Application Engineer Intern

Validated firmware and prototyped an ESP32-to-cloud I²C/MQTT telemetry path.

Education and tools

Background

Education

UCLA
M.S. Computer Science · starting Fall 2026

USC
B.S. Computer Science · 2026
GPA 3.76/4.00 · Viterbi Dean’s List

Working toolkit

ML & systems
Python, C/C++, CUDA, Triton, PyTorch, TensorFlow

Product engineering
FastAPI, PostgreSQL, TypeScript, React, Next.js, Docker, Linux, AWS, GCP, MQTT