The CoSign app home screen showing tax forms ready to be signed.

CoSign

Enhancing the e-signature experience with biometrics and NFC. Awarded 1st Place in the Dropbox HelloSign Hackathon 2022.

The CoSign app home screen showing tax forms ready to be signed.
The CoSign app home screen showing tax forms ready to be signed.
The CoSign app home screen showing tax forms ready to be signed.

Tools Used

  • UIKit
  • CoreNFC
  • LocalAuthentication
  • Next.js
  • Pusher
  • Amazon S3

Local Authentication provided secure, one-tap consent via Face ID or Touch ID, while Core NFC facilitated linking signing requests to writable NFC devices.

The CoSign app home screen showing tax forms ready to be signed.
The CoSign app home screen showing tax forms ready to be signed.
The CoSign app home screen showing tax forms ready to be signed.

A modular serverless architecture streamlined communication between Vercel, AWS, and the Dropbox Sign API (previously known as HelloSign). Pusher was used in place of web sockets for real-time updates.