About

Hi, I'm Isaac Lee.

I'm a product-minded engineer who enjoys crafting polished experiences around complex workflows — especially where productivity, education, and creative tools meet.

This site is a markdown-first blog: posts live in the repo, deploy quietly to Vercel, and publish straight through GitHub when I'm ready to ship an update.

Product history

A snapshot of the products that shaped how I think about UX and iteration.

Flexcil

Note-taking & PDF annotation for learners.

Helped teams iterate on handwriting UX, document workflows, and performance across iPad and stylus-centric interfaces.

Highlights

Tuning latency-sensitive interactions for stylus input.
Bridging education personas — students, instructors, institutions.
Shipping iterative releases rooted in qualitative feedback.

Current focus

Shipping calm tools with measurable outcomes.

Working across web surfaces (including this very stack) with an emphasis on reliability, observability, and humane defaults for creators.

Themes

Markdown-native workflows with progressive enhancement.
Systems that stay understandable years later.
Collaborating tightly with design & community feedback.

Journey

The narrative arc isn't linear — these anchors capture the through-line.

2018 — Present

Building thoughtful productivity tools

Focused on calm interfaces, handwriting workflows, and tight iteration loops with real users.

2016 — 2018

Early experiments

Shipped prototypes across notes, PDF tooling, and mobile UX — learned how distribution shapes product decisions.