Creating value from data β λ°μ΄ν°μμ κ°μΉλ₯Ό λ§λλ μ¬λ
Platform & AI Engineer @ SK Telecom. I turn data into value β building the platforms that let people work with their data effortlessly, and the LLM-powered agents that act on that data for them. Whether it's a self-service cluster platform or a domain-expert AI agent, the goal is the same: shorten the distance between people and the value hidden in their data.
Building a multi-tenant, self-service data platform that auto-provisions per-user Spark / StarRocks clusters on Kubernetes β operating thousands of clusters (hundreds concurrent). Working across the core orchestration service, the K8s operator, the API, observability, and CI/CD.
| Area | Highlights |
|---|---|
| K8s Platform & Operators | Per-user Spark/StarRocks cluster orchestration Β· SharedIndexInformer-based controllers Β· multi-tenant performance tuning Β· idle-cluster Auto-Stop for cost optimization |
| LLM / AI Agents | Multi-step AI agent for the semiconductor-manufacturing domain (cut troubleshooting from hours to ~1 min) Β· stage-level agent evaluation Β· vLLM serving of Llama / Qwen / GPT-OSS |
| RAG Systems | HR chatbot with semantic, sentence-relevance chunking Β· SFT/DPO fine-tuning Β· self-hosted LLM-as-a-judge evaluation |
| Observability | Prometheus / Grafana / Thanos monitoring Β· annotation-based metric auto-instrumentation Β· custom alerting pipelines |
- StarRocks β Fixed
CREATE DATABASE IF NOT EXISTSbeing ignored on Iceberg REST catalogs by translating Iceberg-level exceptions in the FE connector, with unit tests. Merged intobranch-3.5(ships in 3.5.20) Β· #75019 (merged); main-branch PR in review Β· #75017 - StarRocks K8s Operator #769 β Exposed hardcoded controller-runtime manager options (SyncPeriod, MaxConcurrentReconciles, QPS/Burst) as operational flags / Helm values for large-scale tuning
- Building Domain-Expert Agents β AICO Seoul (AI Community Conference), Microsoft Korea Β· Nov 2025
- Online Aggregation in Trino β Trino KR Meetup #2, SKT Enterprise Β· Sep 2023
- π Blog β ycra-dev.github.io
- πΌ LinkedIn β in/youngcheor-ra
- π§ Email β ycra.dev@gmail.com