AI / ML Engineer

Hi, I'm Xiangxu Kong.

I build AI/ML systems across model infrastructure, agentic RAG, and research-to-production workflows, with a background in physics and quantum computing.

Current focus

  • ML infrastructure and model evaluation platforms
  • Agentic RAG systems with LangChain / LangGraph-style workflows
  • Research-to-production ML pipelines
  • Quantum machine learning and tensor networks

Engineering

Featured Engineering Projects

Production-style systems that show backend design, ML evaluation, agent workflows, and reproducible experimentation.

AtlasML

ML infrastructure platform for model registry, inference, evaluation tracking, async jobs, and benchmarking.

FastAPI PostgreSQL SQLAlchemy Redis/RQ Pydantic
  • Model registry and versioning
  • Inference and evaluation APIs
  • Async job orchestration
View project

ContextForge

Agentic RAG backend for engineering knowledge, code, logs, tool calling, and grounded answers.

RAG LangChain LangGraph FastAPI PostgreSQL/pgvector
  • Document and code ingestion
  • Retrieval and citation-grounded answers
  • LangGraph-style agent workflow
View project

QuantLab

Research-to-production ML backtesting framework with leakage-safe validation and transaction-cost-aware evaluation.

Python pandas scikit-learn XGBoost Financial ML
  • Data caching and feature engineering
  • Walk-forward validation
  • Baseline vs ML strategy comparison
View project

Research

Research Snapshot

Research notes and projects connecting quantum computing, tensor networks, simulation, and machine learning.

Tensor Network Classifiers for Image Classification

Exploring compact tensor-network representations for supervised learning and interpretable model structure.

Research question

Can tensor network architectures provide useful inductive bias for small-scale image classification while remaining interpretable and computationally controlled?

Methods

Matrix product states Tensor train decompositions Feature maps Supervised classification experiments

Status: Active research notes

View research

Quantum Machine Learning / State Preparation

Notes and experiments around quantum feature maps, state preparation, and QML model behavior.

Research question

How do state preparation choices influence quantum machine learning experiments, and where do simple baselines reveal the real difficulty?

Methods

Quantum circuits State preparation Variational experiments Baseline comparisons

Status: Experiment planning and note consolidation

View research

Double-Bracket QITE / Quantum Simulation

Research notes on imaginary-time evolution, simulation workflows, and numerical behavior.

Research question

How can double-bracket and QITE-style methods be organized into clear, testable simulation workflows?

Methods

Imaginary-time evolution Hamiltonian simulation Numerical experiments Convergence analysis

Status: Notes in progress

View research

Writing

Selected Writing

Placeholder entries for technical notes and longer essays that will grow with the site.

Building a Production-Style ML Model Registry

TODO: draft

A practical note on model versions, artifacts, metrics, and serving boundaries.

ML Infra FastAPI Evaluation

Agentic RAG with LangGraph: Design Notes from ContextForge

TODO: outline

Workflow boundaries, retrieval quality, tool calls, and grounded answer design.

RAG LangGraph Agents

Walk-Forward Validation for Financial ML

TODO: planned

How temporal validation, costs, and baselines keep experiments honest.

Financial ML Backtesting