# Yejin C.

> Software Engineer | Applied AI Systems • Retrieval-Augmented Generation (RAG)

Location: New York City Metropolitan Area, United States
Profile: https://flows.cv/yejin

I’m a Software Engineer passionate about building applied AI systems that connect data, models, and real-world impact. My work focuses on Retrieval-Augmented Generation (RAG) and scalable AI infrastructure, designing systems that transform advanced models into practical, reliable solutions.
I enjoy exploring how emerging AI technologies can enhance the way we access and use information!

## Work Experience
### Software Engineer II @ Elsevier
Jan 2023 – Present
- Global Elsevier Data Engineering Team
    - RAG (2025)
    - AI Platform team (2026- )

- Health Markets Platform team (2023-2024)

### External Affairs Coordinator - KoGSA @ University of Pennsylvania
Jan 2021 – Jan 2023
Maintain Instagram page to communicate with stakeholders and promote events for Korean Graduate Student Association

### Graduate Teaching Assistant @ University of Pennsylvania
Jan 2022 – Jan 2023 | Philadelphia, Pennsylvania, United States
CIS 5500 - Database & Information Systems
- Graduate level course in database design, modeling data, query optimization, client-side & server-side Web development

### Data Scientist @ Elsevier
Jan 2022 – Jan 2022 | Philadelphia, Pennsylvania, United States
• Developed a sentence embedding model using Natural Language Processing to improve information retrieval from medical literatures for search queries used in Elsevier's ClinicalKey search engine
• Pre-processed complex medical textbook data retrieved from AWS S3 bucket and parsed 20 features for modeling
• Queried thousands of relations in Elsevier’s Healthcare Knowledge Graph by accessing API with GraphQL
• Evaluated model by analyzing 20000 known relation-sentence matches and achieved an ROC score of 0.98 (improvement from model currently used in production)

### Research Fellow @ Colgate University
Jan 2020 – Jan 2021 | Hamilton, New York, United States
Supervisors: Dr. Ahmet Ay, Dr. Krista Ingram
•	Developed a mathematical model simulating human circadian rhythm clock using 30 ordinary differential equations and parallel computing in MATLAB
•	Estimated 98 parameters successfully using a stochastic ranking evolution strategy search algorithm that reproduced experimental data linking 6 circadian clock genes and diurnal preference
•	Published to The Journal of Affective Disorder Dec 2022

### International Students Life Policy Coordinator - Student Government Association @ Colgate University
Jan 2020 – Jan 2021

### Computer Science Teaching Assistant - Python tutor @ Colgate University
Jan 2020 – Jan 2021 | Hamilton, NY, United States
• Provide aid to students during lab by approaching them and explaining important topics to help students resolve errors and improve code
• Guide students in the right direction when doing Python programming assignments, encouraging them to come up with independent solutions

### IT Service Desk Attendant @ Colgate University
Jan 2017 – Jan 2021 | Hamilton, NY
• Provide in-person technical support in areas such as software downloads, Internet connectivity, and printer driver installation and friendly customer service
• Lend technology equipment to students and faculty and maintain inventory

### Summer Research Fellow - Chemistry @ Colgate University
Jan 2019 – Jan 2019 | Hamilton, New York
Supervisor: Dr. Anne Perring, Department of Chemistry
Project: Measurements of primary biological aerosol in Upstate NY

• Using Python pandas, developed an efficient and reliable technique for identifying Primary Biological Aerosol Particles (PBAP) data and generated graphs analyzing seasonal and regional variations
• Handled 350 commercial datasets collected using Instascope/WIBS-4 from four different locations of the country

### Student Intern at Office of International Student Service @ Colgate University
Jan 2019 – Jan 2019 | Hamilton, NY
• Planned monthly events to promote international student community bonding and to ensure the well-being of international students at Colgate University
• Facilitate individual’s transition into the new environment by providing emotional support through sharing own experience

### Treasurer - Korean Cultural Association @ Colgate University
Jan 2018 – Jan 2019 | Hamilton, New York, United States
• Wrote budget proposals to the Budget Allocation Committee to receive funds to successfully host three main events every semester
• Collect and maintain a budget of $2400 for the organization using Microsoft Excel

### Founder of SkinEd @ Thought Into Action Entrepreneurship at Colgate
Jan 2020 – Jan 2021 | Hamilton, NY, United States
SkinEd — Data-driven online education platform promoting transparency in skincare ingredients and the cosmetics industry

- Conducted market research, customer surveys, and competitive analyses to identify target audiences and refine product strategy
- Collaborated bi-weekly with alumni mentors and TIA founders to develop business goals and improve platform design


## Education
### Master of Science - MS in Computer and Information Science
University of Pennsylvania

### Bachelor of Arts - BA in Computer Science and Minor in Mathematical Systems Biology
Colgate University

### Study Abroad Program Fall 2019 in Computer Science
The University of Manchester


## Contact & Social
- LinkedIn: https://linkedin.com/in/yejincha

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Source: https://flows.cv/yejin
JSON Resume: https://flows.cv/yejin/resume.json
Last updated: 2026-04-05