CTO building developer-first products for mobile retention, customer engagement, and agent workflows.

• Clix — AI-native mobile retention and customer engagement platform for developers
• OpenClix — open, agent-friendly messaging stack with a vendoring-first distribution model
• Agent infrastructure — MCP, A2A, docs search, and tooling for AI-assisted workflows

Software engineer and product-minded CTO based in Seoul / SF Bay Area.

Over the last 15 years, I've worked across experimentation platforms, CRM marketing automation, mobile growth tooling, and developer infrastructure. I like products that make complex systems feel simple for developers.

Named after Werner Herzog's 1982 film Fitzcarraldo — a story of a man who hauls a 320-ton steamship over a mountain in the Amazon jungle to build an opera house. I stumbled upon the film by chance and watched it young, so it was a bit hard to follow, but the sheer image of dragging that ship up the mountain — filmed without any special effects — never left me. When I needed an ID for games, email, and other accounts, fitzcarraldo felt distinctive enough — but it was taken more often than expected, so I slightly twisted it into pitzcarraldo. I've used it everywhere since, including Gmail, GitHub, and Twitter. The name carries the spirit of the film: getting the impossible done, no matter how absurd the odds.

Developer-first AI customer messaging and retention platform — covering mobile engagement, in-app messaging, push & live activity, retention analytics, experimentation, and AI-assisted campaigns.

Open, vendoring-first messaging stack for the agent era.

Built for easier local customization, fewer dependency issues, and better compatibility with AI coding agents.

Exploring MCP servers, A2A interoperability, LLM-ready docs/search, multi-agent workflows, and AI-native DX patterns.

AI-native mobile retention and customer engagement platform for developers.
SDKs · messaging orchestration · observability · AI-assisted campaigns · MCP server for docs and agent workflows
Includes OpenClix — an open, vendoring-first distribution of the messaging stack for agent-era development.

CRM marketing automation platform.
Multi-channel campaign orchestration · performance optimization · platform engineering at Grey Box.

A/B testing infrastructure, near real-time experiment processing, and large-scale platform modernization from monolith to microservices.

Built the video platform from scratch as an intern-turned-engineer. Recommendation engine, distributed video infrastructure.

• Agent Fatigue

• reduxible — React + Redux development toolkit
• universal-fetch — Isomorphic Fetch API for browser and server environments

• Code is writing. It should be clear to the next reader — whether human or agent
• Ideas are cheap, launching is harder, and retention is hardest. Product, engineering, and distribution are the same conversation
• Engineers exist to move the business forward. Pragmatic architecture over fashionable complexity
• Sharp razors dull fast; a well-maintained axe lasts decades. Sustainable transitions matter more than early peaks
• Constraints sharpen decisions. A failed product you shipped teaches more than a perfect one you planned
• Don't assume you understand — ask. Over-communication beats interpretation, especially across different backgrounds and experiences
• Make complex systems feel simple. DX is not polish — it's core product quality

AI-native SaaS, mobile retention infrastructure, agent interoperability (MCP / Skills, A2A), vendoring-first developer tools, OSS-to-cloud strategy, and fast iteration loops for startup teams.

Building products for developers, mobile apps, and the agent-native future.