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Work and case studies

Real systems. Honest status.

Some projects are operational and anonymized, some are public prototypes, and one is a live App Store product. Each case says which it is, what problem it addresses, and what Leon built.

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Selected work

Business problems, working interfaces, and inspectable evidence.

The Home Screen catalog of local-business destinations A business-specific menu and cart inside The Home Screen

Prototype · mock payments

The Home Screen

Problem: Explore how many local-business menus could share one familiar, phone-first interface.

Built: A 37-business catalog with search, business-specific menus, a prototype cart, server-side repricing, and vendor-separated demo tickets.

Honest boundary: Payment and kitchen progression are simulations. It is not presented as a production ordering client.

Role: full-stack prototype developer

Open a live business page →

Live product · App Store

Curio

Problem: Turn passive scrolling into short, source-backed learning.

Built: The React and TypeScript client, native iOS shell, Express and Postgres backend, subscriptions, content pipeline, and four-language product experience.

Public proof: The product is downloadable on the U.S. App Store and its public founder profile identifies Leon's role.

Role: solo product developer

Open on the App Store → View the founder profile → See mobile app development →
Loqol seller questionnaire with conflicting public-sewer and septic-tank answers saved Three-page California disclosure PDF generated from saved Loqol answers Loqol flags the sewer and septic contradiction for review

Public demo · incomplete signing and email steps

Loqol disclosures

Problem: Translate a dense California disclosure form into a guided seller workflow.

Built: An 82-question seller flow, 16 consistency rules, an agent review workspace, saved answers, and a three-page PDF output.

Honest boundary: Buyer and agent signing plus seller email delivery are not complete.

Role: full-stack product developer

Open the public demo → Inspect the source →

Additional project archive

Operational patterns behind the interfaces.

These anonymized project notes preserve useful implementation detail. They are not presented as public client demos or outcome guarantees.

Internal workflow · client anonymized

Review desk

Problem: Review notifications arrived faster than a small team could classify and answer them consistently.

Built: An inbox workflow that classifies the issue, drafts from verified business facts, and routes a Gmail draft, Slack card, and sheet row to a person.

Control: The workflow never posts a reply. A human reviews and sends it.

Internal workflow · client anonymized

Document control

Problem: Company documents and approvals lived across folders, inboxes, and memory.

Built: A template request creates and files the document; approval locks it; publishing increments the version, writes the change log, and exports the external PDF.

Handoff: The workflow was implemented in Apps Script and as six editable n8n workflows.

Regulated-market prototype · Chinese language

Compliance-aware assistant

Problem: Health-education answers needed source citations and deterministic safety limits in a market with strict advertising rules.

Built: Safety screening before the model, hybrid retrieval, evidence tiers, numbered citations, and a final legal-claim validator.

Control: If a revised answer still fails validation, the assistant declines rather than guessing.

See the portfolio archive or source repositories on GitHub.

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