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AI Systems Engineer & LLM Red-Teamer · Production Agentic Systems and Adversarial Safety
| Production Footprint | Full-Lifecycle Velocity | Testing & Verification | Defensive Automation |
|---|---|---|---|
| 5 Hospitals × 12 Languages Nova 2 Lite + Haiku 4.5 routing |
1,152 Commits · 116 Releases Sole author from empty repo to production |
1,656 Tests · 96% Coverage Typed contract oracle · SMS auth |
198 Codified Controls 128 infra + 70 KISA guardrails |
• Core AI & Cloud: Python 3.11+ · AWS Bedrock (AgentCore) · Claude Haiku 4.5 · Nova 2 Lite · FastAPI · Lambda · PostgreSQL · Terraform
• Security & Ops: Datadog LLMObs · AST Read-Only Screening · TruffleHog CI · GitHub Actions · OpenSSF Scorecard
- CES 2026 Innovation Honoree & KSA Service AI Leader 2026: Responsible engineer and submission author for award-winning production AI agent (CES Honoree · KSA Announcement)
- AIM Arena 2026: #33 on global leaderboard with 709.00 points and 91 confirmed breaches (Leaderboard)
- SFASS 2026: 5th of on-site Top 7 (Coverage) · Korea MFDS Challenge 2025: Grand Prize (Announcement)
🔍 Architecture Deep Dive & 20-Layer Defense Matrix (Click to expand)
flowchart LR
Client([User Utterance]) --> Ingress[Lambda Ingress Proxy]
Ingress --> Guard[Screening & Threat Scoring]
Guard --> Router{Complexity}
Router -->|Fast Path| Nova[Amazon Nova 2 Lite]
Router -->|Escalation| Haiku[Claude Haiku 4.5]
Nova & Haiku --> ToolGate{Auth Gate}
ToolGate -->|SMS Auth| CRM[CRM / Booking Mutation]
ToolGate -->|Read Only| KB[(Bedrock Knowledge Base)]
CRM & KB --> OutputGuard[HIPAA / PII Scrub]
OutputGuard --> Stream([FastAPI SSE Stream])
- Two-Stage Model Routing: Fast queries route to Nova 2 Lite; clinical questions escalate to Claude Haiku 4.5.
- Fail-Closed Retrieval: The system pulls 20 chunks from the KB and reranks them in Seoul. Scores under 0.5 fall back to standard guidance to prevent medical hallucinations.
- Zero-to-Production Deliveries: Stateless reservation agent (17 typed contract modes, 1,656 tests, 96% coverage) · Bedrock KB admin backend on FastAPI, Lambda, and Terraform · Real-time voice agent with OpenAI Realtime and Bedrock Nova Sonic.
| Tier | Layers | Defense Mechanism & Implementation |
|---|---|---|
| Ingress & AST | L1-L5 | Unicode normalization, prompt injection screening, strict input bounding |
| Semantic & Intent | L6-L10 | Jailbreak heuristics, dynamic threat scoring, enforce-vs-notify policy split |
| Execution Sandbox | L11-L15 | Pre-warmed ARM64 container isolation, read-only AST checkers, SMS auth gates |
| Egress & Audit | L16-L20 | PII scrubbing, HIPAA compliance filter, Datadog LLMObs distributed tracing |
- Last updated: 2026-09-06
- 8,688 contributions in the last 12 months
- 23 pull request contributions and 204 commit contributions across 13 repositories
- 22 owned public repositories and 79 owned private repositories (excluding forks)
- Private and internal work represent most of the recent contribution volume