$ backend-ai-platform-engineer

Gyuho Lee

Backend infrastructure, AI platforms, and real-time telemetry systems for production AI.

Telemetry ingestion
High-volume
Dataset analyzed
Large-scale
Inference cost
Reduced

// projects

Projects

Built Lydia, an agentic AI assistant for high-volume telemetry analytics, and designed the durable event-delivery platform behind its multi-turn tool-calling workflows.

Agent Workflow
Tool-calling SQL
Analytics Store
ClickHouse
Durable Delivery
Outbox + MSK
TypeScriptMySQLClickHouseKafka/MSKRedis StreamsSocket.ioDuckDBEC2OpenTelemetry

Behavioral Efficiency Scoring with Double Machine Learning

Software Engineer · Dec 2024 - Present

Built a causal evaluation framework that separated behavioral signal from environmental confounders, producing fair rankings and actionable coaching insights for operations teams.

Cohort Evaluated
Team-wide
Efficiency Gap Quantified
Confounder-adjusted
Savings Opportunity
Significant, recurring
PythonPyTorchScikit-LearnSHAPAWS S3Statistical Inference

Event-Driven Telemetry Fan-Out for Real-Time Operations

Software Engineer · Dec 2024 - Present

Built Kafka and Redis Pub/Sub fan-out paths for live high-volume telemetry, enabling sub-second operator dashboard updates and horizontally scalable real-time processing.

MQTT Volume
High-volume
Dashboard Freshness
Sub-second
Query Latency Reduction
Substantial
TypeScriptNestJSRedisKafkaAWS ECSMySQLMQTT

Self-Hosted LLM Inference for Lydia

Software Engineer · 2024 - 2025

Deployed vLLM and llama.cpp on on-prem GPU infrastructure behind EC2, NGINX, and Route 53, replacing hosted inference and reducing the assistant's serving cost.

Internal Users
Internal eng team
Daily Query Volume
Regular usage
Infra Cost Reduction
Meaningful
vLLMllama.cppNGINXRoute 53EC2PythonTypeScript

Arcade Playground

Tetris and Pac-Man experiments built to showcase deterministic loops, collision systems, and state modeling.

Explore two playable classics on a dedicated route so the core portfolio stays focused and fast.

Open ArcadeTetris + Pac-Man

Listening

From my YouTube Music playlist.

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