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Woo Sik Choi

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Woo Sik Choi

Portfolio, engineering notes, and project case studies.

Start Here

A practical map for the Codex Product Lab.

This site is not an AI news blog. It is a build-in-public lab for shipping useful tools, validating templates, documenting tradeoffs, and turning repeated demand into productized services.

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Operating principles

Build small enough to ship.

Validate demand before overbuilding.

Use AI as leverage, not as fake proof.

Prefer useful tools over copied content.

Turn repeated pain into templates or services.

Best next actions

Choose the path that matches your intent.

New visitors should be able to try a tool, follow the build, inspect experiments, or ask about a prototype without hunting around.

Start Here

A fast map of the lab, the funnel, and the best first actions for new visitors.

Experiments

Build-in-public experiments that connect code, product thinking, and validation.

Tools

Free practical tools that help visitors validate product ideas before overbuilding.

Templates

Reusable kits and waitlists for patterns that prove useful through real demand.

Newsletter

Owned-audience updates for build logs, tool releases, template notes, and lessons.

Hire Me

Productized full-stack services for prototypes, internal tools, and data-backed apps.

Service path

Need a practical prototype or internal tool?

The lab is also proof of work. If you need a focused full-stack prototype, start with the hire page.

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