Experience
My professional journey in data and analytics
Work Experience
Analytics Engineer
Hwahae Global Seoul, South Korea
#1 K-Beauty data platform in South Korea. Provides cosmetics ingredient analysis and personalized product recommendations for global consumers.
Key Achievements
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Internal AI Analytics Agent
Built and launched a Slack-based NL2SQL AI agent (Cloud Run + Claude API + BigQuery MCP + DataHub MCP), adopted by 70% of the company for self-serve analytics.
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Advertising Data Mart
Designed end-to-end B2B ad performance SSOT — the company's first unified view of ad contracts, revenue, and performance across all ad products.
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CDC Pipeline Architecture
Architected 3-layer CDC pipeline (RDS → BigQuery) using GCP Datastream for near real-time data ingestion with cost-optimized queries.
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Production Data Pipelines
Built pipelines serving live product features (trending keywords, marketing notifications) and CRM targeting via Braze CDI integration.
Analytics Engineer
Wrtn Technologies Seoul, South Korea
Largest AI portal in South Korea offering free unlimited generative AI. Sole Analytics Engineer managing data across three major products.
Key Achievements
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DW Layer Enhancement
Designed a new Core Layer and standardized the DW hierarchy, ensuring consistent metric definitions and faster data access.
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Automated Specification Generation
Built an automated documentation pipeline using dbt macros to generate and maintain data specifications, improving Text2SQL AI Agent accuracy.
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Idempotent dbt Incremental Macros
Developed and standardized dbt incremental strategy macros, replacing legacy batch scripts with a robust and idempotent approach.
Data Engineer
Coinone Seoul, South Korea
One of South Korea's top cryptocurrency exchanges, part of the "Big Four" alongside Upbit, Bithumb, and Korbit. One of three Data Engineers building ELT pipelines and dbt-based data marts.
Key Achievements
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Marketing Event Settlement Automation
Standardized settlement logic using BigQuery TVFs and built reusable templates integrated with internal Admin system.
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PII Masking Pipeline
Implemented Terraform-coded infrastructure invoking GCP Sensitive Data Protection APIs as BigQuery Remote Functions.
Analytics Engineer
IoTrust (D'CENT Wallet) Seoul, South Korea
Maker of D'CENT, the world's first biometric hardware crypto wallet. First and only data professional at the company, leading all data-related decisions and initiatives.
Key Achievements
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DW & Data Mart Architecture
Designed a dbt-based DW and data mart structure for internal analytics and SaaS BI, improving query efficiency and semantic consistency.
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BI Dashboard Operations
Reorganized Redash around KPI dashboards and introduced Metabase for no-code BI access and broader data democratization.
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Event Taxonomy Management
Defined event and parameter schemas, built QA processes, and standardized documentation for consistent data collection.
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Airflow Pipeline Automation
Established initial Airflow workflows and Slack notification bots to automate data alerts and monitoring.
Data Analyst
IoTrust (D'CENT Wallet) Seoul, South Korea
Maker of D'CENT, the world's first biometric hardware crypto wallet. First and only data professional at the company, leading all data-related decisions and initiatives.
Key Achievements
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Analytics Environment Setup
Designed and implemented an end-to-end stack (GTM → GA4 → BigQuery → Redash) to enable analytics capabilities.
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A/B Testing Task Force Lead
Founded an A/B Testing TF, established frameworks, and oversaw execution and analysis for data-driven experimentation.
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Conversion Rate Optimization
Improved purchase conversion rate (payment start → complete) by 32%p through funnel analysis and optimization.
VBA Programmer (Contract)
Product Asset Consulting Seoul, South Korea
Completed 7 independent VBA engineering automation projects for Hyundai Motor's engineering workflows with 100% personal contribution.
Finance Intern
PeopleFund Austin, Texas, USA
US Treasury-certified CDFI and SBA Lender with $1.2B+ economic impact in Texas, supporting 25,000+ jobs. Analyzed loan portfolio data and presented weekly insight briefings in staff meetings.
Data Entry Intern
Korea Listed Companies Association Seoul, South Korea
Collected, cleaned, and entered financial statements of listed companies. Gained early experience in automating repetitive workflows using Excel and VBA.
Equity Research Assistant Intern
Heungkuk Securities Seoul, South Korea
Extracted and visualized financial data for analyst reports using Bloomberg Terminal and Excel.
Education
M.Eng. in AI Big Data
Kookmin University, Seoul
Key Courses: Python Programming, Data Modeling & SQL, Statistics, Machine Learning, Deep Learning, NLP, Vision AI
GPA 4.50/4.50 (1st Semester) - Academic Excellence Scholarship
B.A. in Philosophy & B.B.A. in Finance
Chung-Ang University, Seoul
Key Courses: Logic, Business Administration, Marketing, Economics, Financial Economics, Mathematical Statistics
Dean's List Scholar (Top Student, 3rd & 4th Semester)
Senior Representative, Student Council (7th Semester)
Certifications & Courses
Data Engineering
- Data Engineering Zoomcamp DataTalksClub
- dbt Bootcamp Udemy
- Data Warehouse Udemy
- Kafka Udemy
Infrastructure & DevOps
- Deploying Airflow on EKS with Helm, GitOps, and CI/CD Udemy
- Kubernetes Inflearn
- Airflow Inflearn
- Git/GitHub Inflearn
Programming & Analysis
- The Advanced SQL Course Udemy
- Data Analyst with Python Track DataCamp
- Excel/VBA for Creative Problem Solving Coursera
Interested in working together?
I'm always open to discussing new opportunities in data engineering and analytics.