Products, systems, and tools made with care.
An archive of product work across digital health, AI-assisted writing, design systems, and local-first software. Each case study covers the problem, approach, and outcome.
91life
Digital health platform
Patient-facing web app for scheduling, records, and asynchronous care. Shipped a cohesive design system and rebuilt core flows for speed and accessibility.
Product / Design system / Healthcare
Next.js / TypeScript / PostgreSQL / tRPC / Tailwind
2024 ↗02Atlas
AI writing workspace
A fast, keyboard-first writing surface with inline AI assistance, versioned drafts, and a calm editor that gets out of the way.
Product / AI / Editor
Next.js / TypeScript / PlateJS / OpenAI / Postgres
2024 ↗03Signal
Design system
A token-driven component library with documented accessibility, motion, and composition rules. Shipped across multiple products.
Design system / Open source
React / TypeScript / Radix UI / Tailwind / Storybook
2023 ↗04Ledger
Personal finance OS
A private-by-default finance dashboard for aggregating accounts, classifying transactions, and planning ahead - without shipping your data anywhere.
Product / Local-first
Next.js / TypeScript / DuckDB-WASM / SQLite
2023 ↗Open source
Infrastructure, systems, and tools in public at github.com/ErzenXz.
Additional work
Some client and company work remains private. I can share additional context, process, and technical decisions in a conversation where the work permits it.
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