$ data-platform-engineer

Gyuho Lee

Data platform, backend infrastructure, and real-time telemetry systems for production AI and connected fleets.

MQTT ingestion
1M+/day
Trips analyzed
55K+
Inference savings
$2K/month

// projects

Projects

Built Lydia, an agentic AI assistant for fleet-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

Driver Efficiency Scoring with Double Machine Learning

Software Engineer · Dec 2024 - Present

Built a causal evaluation framework that separated driver behavior from route and weather confounders, producing fair rankings and actionable coaching insights for fleet operations.

Drivers Evaluated
35+
Efficiency Gap Quantified
$0.14 kWh/km (12%)
Savings Opportunity
$38K+/fleet annually
PythonPyTorchScikit-LearnSHAPAWS S3Statistical Inference

Event-Driven Telemetry Fan-Out for Fleet Operations

Software Engineer · Dec 2024 - Present

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

MQTT Volume
1M+/day
Dashboard Freshness
Sub-second
Query Latency Reduction
42%
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 Lydia serving cost.

Internal Users
7 engineers
Daily Query Volume
400+
Infra Cost Reduction
$2K/month
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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