ExcogitarNeil Kwon
Portfolio

Excogitar — Neil Kwon, Full-Stack Engineer & CTO

Excogitar
Aqueductus Coelestis · Infrastructure at scale

Thought, rendered
as architecture.

I'm Neil Kwon — a full-stack engineer and two-time CTO. Over 16 years I've built the aqueducts that carry intelligence: AI platforms, big-data pipelines, and systems that scale from prototype to IPO.

Generative AIBig DataCloud architecture
16+ yrs shipping CTO ×2 English · Japanese
02Opera Excogitata

Projects & Products

What I'm building — a flagship product and a suite of agent, harness, and MCP tooling.

Metis Stream

Platform
Replay-driven agent platform

A multi-tenant agent platform where organizations evolve agents with auditable confidence: every promoted skill must beat the previous baseline on replayed historical trajectories before it ships.

Multi-tenantReplay evolutionPostgreSQLMCP / A2A

harness-injector

Agent tooling
Agent harness engine

The engineering base for harness-based agent operation. It injects the right knowledge (RAG) into an AI session while exposing execution tools over MCP — separating what the agent knows from what it can do, and keeping the context window lean.

HarnessRAGMCPpgvector

code-gen-bridge

Agent tooling
Event-driven code executor

An async microservice that reacts to external events and autonomously generates code by running the Claude Code CLI inside sandboxed workspaces — every step captured in a structured trace, results delivered by callback.

AsyncFastAPIMCPAutonomous codegen

slack-block-kit-builder

Agent tooling
Slack Block Kit MCP server

A standalone MCP server that lets LLM agents compose rich, interactive Slack messages with Block Kit — stateless, with no Slack tokens or network access required.

MCPSlackBlock KitStateless

Context Engineering Lab

Education
LLM education playground

An interactive playground where junior developers practice and compare RAG, prompt engineering, LLM parameters, agent tool-calling, and GraphRAG hands-on. Spring AI backend, Next.js front, Neo4j + Qdrant.

Spring AINext.jsNeo4j / QdrantGraphRAG

low-poly-generator

Creative tool
Generative wireframe visuals

A generator for low-poly animations and wireframe visuals for the web — the same generative-geometry spirit that drives this site's hero.

GenerativeLow-polyWebWireframe
03Ratio Operandi

Development Philosophy

I don't chase technology trends — I work to understand a technology's essence and limits, then convert it into value for the organization and its customers. Across sixteen years a consistent way of working emerged: robust design and strong execution, with agents, knowledge, and evidence fitting together.

01

Harness-first engineering

I build the operating layer before the feature. A reusable harness injects knowledge (RAG) and exposes tools (MCP), so an agent does real work on a lean context — what it knows and what it can do, kept cleanly apart.

02

Evolve with evidence

No skill ships on a hunch. Every change must beat the previous baseline on replayed history — improvement you can measure and audit, not conviction without proof.

03

Intent → running system

I treat the agent as a builder. Specs become running code through autonomous, event-driven execution — prototyping at conversational speed, with every step traced and reproducible.

04

Engineer the context, not just the prompt

A model's output is only as good as what it's given. I design what the model sees — retrieval, memory, and tool surfaces — so the right knowledge arrives at the right moment.

05

Robust design, strong execution

Design documents don't ship products. I stay hands-on — writing code when it matters, digging into performance issues and failure root causes — and hold responsibility until the project becomes a real result.

06

Technology, tied to business outcomes

From founding a startup to national R&D, I weigh technical completeness against business viability — validating new models fast without mortgaging the traffic, data, and organization the service will need after it grows.

Let's connect

Devise something together.

Building something at the intersection of AI, scale, and good engineering? I'd love to hear about it — reach me on LinkedIn or by email.

Connect on LinkedInEmail meGitHub

Neil Kwon · neil@excogitar.com