Hanjie's Personal Website

Key Skills

ML & Optimization: Deep Learning, Elasticity Modeling, Reinforcement Learning, Mixed-Integer Programming, TensorFlow, PyTorch, scikit-learn, TensorFlow Lattice, Pyomo

GenAI & Multimodal: OpenAI APIs, Prompt Engineering, RAG, Persona Modeling, Embeddings

Data & Tools: Databricks, AWS, Jupyter/IPython, Pandas, NumPy, SciPy, HTML/CSS, Airflow

Soft Skills: Cross-functional leadership, Technical mentorship, Roadmapping, Product-algorithm alignment

Expedia GenAI Hackathon – 2nd Place Winner
- Achieved 2nd place among 30+ teams in the Expedia Astronaut Expedition 2025 hackathon.
- Received $2000 team award for developing a traveler-facing GenAI product prototype.
- Proposal influenced internal exploration of product innovation strategies.

Expedia Travel Award
- Recognized for outstanding performance in A/B testing that achieved $21M GBV uplift per year.
- Received $1000 per person award for exceptional contribution to business outcomes.
- Demonstrated significant impact on company revenue through data-driven optimization.

Expedia GenAI Hackathon – 2nd Place Winner
Expedia Astronaut Expedition 2025
- Developed a traveler-facing GenAI product prototype enhancing the vacation rental experience.
- Leveraged OpenAI models and prompt engineering to summarize the conversation between host and traveler, feed the hosts with how they could improve via personalize recommendations to emotional engagement.
- Recognized among top 2 of 30+ teams; proposal influenced internal exploration of product innovation strategies.

Traveler Persona & Avatar Personalization Engine
Expedia Brainwave AI Hackathon, 2025
- Designed a system using LLMs (OpenAI) to summarize traveler behavior into personas for personalization.
- Integrated semantic filtering and RAG techniques to retrieve context from conversational and booking data.
- Enabled downstream badge recommendation and ranking refinement based on persona-matching.

Doordash Estimated Delivery Time:
- A machine learning project that estimates the Doordash delivery time including:
  - Case study and business understanding
  - Data preprocessing and analysis
  - Machine learning predictions with linear, Lasso, random forest and XGBoost including hyperparameter tuning

Q-Chem:
- Fully in charge of the Restricted Active Space - Spin Flip (RAS2-SF) method development in Q-Chem 5.
- Planned and implemented 3 new features for the program, including Charge Transfer Calculation, Relativistic Effect and Solvent Effect Calculations (paper under preparation).
- Facilitated experimental designs of the solar cell and semiconductor materials using mathematical predictions with the method developed. Please see the Publication list for more details.

Interface between Q-Chem and Psi4:
- This mini program automates the creation of input files for Psi4 program based on the Q-Chem files. After the Psi4 output is generated, it could also help organize the output and analyze the matrices.

Personal Website:
- The personal website is generated with full stack coding with HTML and CSS/SCSS skills acquired. It can also be used as a template.

Benedetta Carlotti, Ifeanyi K. Madu, Hyungjun Kim, Zhengxu Cai, Hanjie Jiang, Angelar K. Muthike, Luping Yu, Paul M. Zimmerman and Theodore Goodson, III, Activating intramolecular singlet exciton fission by altering π-bridge flexibility in perylene diimide trimers for organic solar cells

Angelar K. Muthike, Benedetta Carlotti, Ifeanyi K. Madu, Hanjie Jiang, Hyungjun Kim, Qinghe Wu, Luping Yu, Paul M. Zimmerman and Theodore Goodson, III, The Role of the Core Attachment Positioning in Triggering Intramolecular Singlet Exciton Fission in Perylene Diimide Tetramers

Ifeanyi K. Madu, Hanjie Jiang, Audrey Laventure, Paul M. Zimmerman, Gregory C. Welch and Theodore Goodson, III, Impact of Ring-Fusion on the Excited State Decay Pathways of N-Annulated Perylene Diimides

Wen Guo, Xingquan Zou, Hanjie Jiang, Karl Koebke, Marie Hoarau, Ralph Crisci, Tieyi Lu, Tao Wei, Neil E. Marsh and Zhan Chen, Molecular Structure of Surface Immobilized Super Uranyl Binding Protein

Lloyd Fisher Jr., Ricardo Javier Vázquez, Madeleine Howell, Angelar K. Muthike, Meghan E. Orr, Hanjie Jiang, Betsy Dodgen, Dong Ryun Lee, Jun Yeob Lee, Paul M. Zimmerman, and Theodore Goodson III Investigation of Thermally Activated Delayed Fluorescence in Donor–Acceptor Organic Emitters with Time-Resolved Absorption Spectroscopy

Bushra Alam, Hanjie Jiang, Paul M. Zimmerman, and John M. Herbert, State-specific Solvation for Restricted Active Space Spin-Flip (RAS-SF) Wave Functions based on the Polarizable Continuum Formalism In preparation

Hanjie Jiang, Duy-Khoi Dang, Soumi Tribedi, and Paul M. Zimmerman Optimized Slater-Type Basis Sets for Correlation-Consistent Calculations In preparation