The project
Sign without printing
Sign Flow is ITDM’s platform for signing PDF documents: you upload the file, place the fields to fill and choose who signs, who approves and who gets a copy. Each person signs from a personal link.
When the process closes, the PDF gets a signature certificate on its last page and reaches the client’s document system through an HMAC SHA-256 signed call. Several clients share the platform, with a showcase, pricing and sign-up.
What we did
- Design
- Web development
- Document integration
Client
ITDM Group
Sector
Electronic signature
Timeline
2026
Signature type
Simple electronic
Model
Multi-tenant
Features
What it does
- PDF upload
- Fill-in blocks on the PDF
- Reusable templates
- Contact book
- Signers, approvers, copies
- Personal expiring link
- Certificate on the last page
- Audit log and file hash
- HMAC SHA-256 signed delivery
- Email via SMTP or Resend
- Showcase, pricing, sign-up
- Multi-tenant, one schema each
Architecture
How it works
- PreparationIn Next.js you upload the PDF, place the fields and choose the recipients.
- SendingNestJS creates the request and emails each person a personal link.
- Signingpdf-lib applies the signatures and the certificate, with audit log and file hash.
- DeliveryThe document goes to MinIO (S3) and to the client’s document system through an HMAC signed call.
Technologies