Hi, I'm Ree Jung 👋

Independent Product Engineer

2025.08 - Present

Seoul, South Korea

Building AI-powered products that solve real-world problems.

• Shipped 4 production AI applications using modern LLM stack (LangChain, RAG, Streamlit), demonstrating end-to-end product development capability from concept to deployment.
• Baby Flashcards PWA (live app): Built and deployed progressive web app combining parenting insights with technical execution, hosted on Netlify with full SEO optimization.
• Language Tutor Agent: Created interactive AI-powered English conversation app with voice/text input, real-time TTS responses, and customizable difficulty levels—addressing real user need for accessible language practice.
• Instagram Automation: Designed n8n workflow for automated carousel posting.
• RAG Agent: Developed retrieval-augmented generation system with vector database (embeddings, retriever, rerank) for intelligent knowledge base queries.

Big Data Research & Analysis

2021.05 - 2025.07

ZIGBANG

Seoul, Republic of Korea

Led end-to-end data science initiatives, owning the complete cycle from problem identification through production deployment—developing ML models and analytical products that informed strategic decisions for construction and financial industry partners.

• Present complex analytical findings to executive stakeholders and external partners, translating technical insights into actionable business recommendations.
• Conducted research and applied ML/DL algorithms and advanced statistical methods to analyze real estate housing market to provide insights and improve decision making system.
• Prototyped, developed, and implemented research analysis on B2B web service to enable consumers in construction and financial industry to intuitively understand real estate markets.
• Developed ETL scripts in Python to load data from multiple sources and to clean and transform data for analysis.
• Developed interactive visualized dashboards to enable data exploration by clients.
• Python, MySQL, Presto, Kubeflow, Airflow, Git, API, Tableau, AppScript, Slackbot.

Senior Data Analyst

2019.05 - 2021.05

Welcome Digital Saving Bank

Seoul, Republic of Korea

Developed data-driven business intelligence solutions, creating comprehensive dashboards and analytical models to optimize performance and inform strategic decision-making.

• Built predictive models for user engagement, conversion optimization, and ROI analysis, contributing to strategic business growth.
• Established robust QA processes for data analytics workflows, ensuring reliability and accuracy of analytical outputs.
• Collaborated with product managers and executives to define analytics requirements and communicate insights effectively.
• Developed alternative credit scoring system and oversaw model validation.
• Python, Oracle SQL, Tableau, Air Bridge.

Data Analyst Consultant

2018.06 - 2019.03

Ernst & Young (EY)

London, U.K.

Delivered data-driven tax advisory insights for private equity clients through complex data transformation and validation workflows.

• Built solutions to extract and transform complex data sets to validate data and check information accuracy and integrity.
• Delivered tax advisory report for private equity executives and partners.
• Python, VBA, Power Pivot, Power Query, HTML, CSS.

Business Intelligence Intern

2018.04 - 2018.08

Meero

Paris, France

Developed data-driven business intelligence solutions, creating comprehensive dashboards and analytical models to optimize performance and inform strategic decision-making.

• Developed comprehensive dashboards and KPI tracking systems to monitor business performance and identify growth opportunities.
• Created compelling visualizations to communicate complex business metrics to stakeholders.
• Extracted and transformed raw data stored in SQL into actionable insights and business strategies.
• Implemented regression analysis on time series data and client segmentation analysis.
• MySQL, Tableau, VBA, R

Data Specialist

2017.11 - 2016.10

Mini Pharmacy Enterprise Inc.

L.A., C.A., U.S.A.

Developed data-driven business intelligence solutions, creating comprehensive dashboards and analytical models to optimize performance and inform strategic decision-making.

• Designed dashboards using QlikSense and PowerBI and eased the presentation of key business metrics.
• Created VBA modules to automate procedure of tracking and calculating balance status of account receivables.
• QlikView, QlikSense, PowerBI, VBA