Working History

Highlights delivered as PL/IC

01

QueryPie

PL / Backend / Platform Engineer

Feb 2025 – Present - Seoul, Korea

Developed necessary features during AI platform development, bringing RAG knowledge service, MCP Proxy, and DB access control engine to production level in a short time.

AI PlatformSecurityRapid Delivery

QueryPie AI - RAG / Knowledge Platform

Jul 2025 – Present

Acted as both PL and IC, bringing knowledge-based RAG service to first deployment in 1 month 3 weeks.

Highlights

  • Designed and implemented entire upload → parsing → chunking → embedding pipeline.
  • Introduced chunking-based streaming indexing in 2 days, reducing memory by 90% for text and 40% for PDFs, processing 10MB files with 1Gi resources.
  • Encrypted customer knowledge across all storage stages with CBC encryption and conducted real-time profiling with py-spy/memray + ephemeral container.
  • Managed retriever quality with DeepEval metrics, achieving 80% correctness on 100 QA pairs.

Tech Stack

PythonFastAPICeleryKotlinSpringPostgreSQLKubernetes

MCP Proxy - AI Agent - McpRegistry

Apr 2025 – Jun 2025

Pioneered development of MCP protocol-interpreting Proxy and internal work agents/registry, currently patent pending.

Highlights

  • Completed MCP Proxy for tool access control and audit logs in 4 days, demonstrated at company town hall.
  • Implemented multi-log analysis and meeting preparation automation with ADK-based ErrorSherlock and BriefButler agents.
  • Built Registry server/admin/CLI and controlled MCP processes via IPC, configured so LLM suggests execution scripts when only GitHub URL is input.

Tech Stack

TypeScriptNode.jsPythonADKSvelte

QueryPie DAC - Database Access Control

Feb 2025 – Mar 2025

Maintained DB Proxy/Engine layer and expanded new protocols.

Highlights

  • Added RESP3 (redis) protocol across entire Proxy and Engine sections.
  • Conducted Oracle protocol reverse engineering to define future support scope.
  • Checked QueryPie user permission verification and masking logic, improving operational quality.

Tech Stack

C#.NETRedisProtocol Engineering