WonSeok Lee
Data Platform · Backend Engineer
a backend engineer building Kafka-based real-time processing, data platforms, and RAG·LLM business automation
About me
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Career
POSCO DX
Full-timeSCM Operations (Backend, Frontend)
Automated Steel-Market Insight Collection with GPT-3.5 Turbo
90%+ insight accuracy
Blocks unsourced answers
Marketing DX Refresh — Sub PL, Backend Development
Performance Overhaul of the Kafka-based Real-time Parallel Data Composition Engine
15s → 0.2s per request
50 threads per engine
Zero-downtime Migration of ~690M Oracle Rows to the Data Lake, with Validation
100% data consistency
Safe migration
Search Engine Design · Data Modeling · Index Sync Development
OpenSearch Auto-sync Driven by DB Change Detection
9 kinds, one search
Up to 400 raw data entries
SCM Software · AX Development & Operations (Backend, Frontend)
Automated Matching of Unstructured Text Against Internal Standards (AX Project)
55% → 90% match accuracy
4h → 5min per review
Independent Dev Workflow for the Ho Chi Minh ODC Team
1-month onboarding
Full SDLC ownership
Bit Training Center
Team LeadJava Expert Program
Legacy System MSA Migration & Mobile Chat Interface
Monolith → microservices
Mobile chat lookup
Certifications
Engineer Information Processing
Human Resources Development Service of KoreaADsP — Advanced Data Analytics Semi-Professional
Korea Data AgencyBig Data Analytics Engineer
Korea Data AgencyAwards
Karma — Unity 3D Game
Jeonbuk National UniversityLed a 3-person team building the core gameplay systems (movement, NPC interaction, quests, UI events) in C#, and designed a real-time Raycast/Collider-based interaction system.
Designed the system architecture: reusable component-based common features via prefabs, with event-driven object interaction logic.