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Cosplio

A shared-expense app for small groups to track spending, split costs equally, and see where everyone stands.

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Cosplio

Technologies used

  • Angular
  • TypeScript

My role

I designed and built Cosplio as a full-stack shared-expense platform, combining an Angular and TypeScript frontend with Firebase Authentication, Realtime Database, and Cloud Functions. I engineered the expense and membership workflows around accurate financial calculations, controlled access, and real-time collaboration.

Notable features

  • Share a live expense ledger, spending reports, and net balances across each group.
  • Split expenses precisely to the cent and generate suggested transfers between members.
  • Protect shared spaces with Google authentication, one-use invitations, and membership-based access.
  • Keep expense history consistent with conflict-aware updates and preserved historical shares.