Keeping track of every coffee chat, without sharing a thing.

The problem

At Berkeley you meet a lot of people quickly, and notes on them end up scattered. A tool for that has to answer one question before any other: can anyone else see my contacts?

What I did

• Built sign-up, sign-in, and a contact list with create, edit, delete, sort, filter, and search, in Next.js on Vercel.
• Stored contacts in Neon Postgres and isolated them with row-level security in the database, so even a direct call to the public Data API can't read someone else's rows.
• Proved it. Queried as the role the API uses while two rows existed, and got zero back.
• Validated input three times: in the form, on the server, and with a database constraint. The friendly message is a courtesy, not the defense.
• Designed all four list states: loading skeletons, two distinct empty states, a plain-language error with one-click retry, and success.
• Captured every screenshot in the write-up from the deployed app, not localhost.

Results

What I'd do differently

Check the security boundary on every push. The isolation test needs two real accounts and a live database, so today it runs on demand. Next: run it in CI against a throwaway database branch that seeds its own accounts.

Artifacts

Try it ↗ · Source on GitHub ↗