Build your own DocuSign alternative with your AI agent
Send documents for signature and get back a sealed PDF whose timestamp anyone can check: envelopes, signing order, a signing page for people outside your company, an audit trail of every view and action, and a trusted timestamp on the final file. It is built to replace DocuSign, Adobe Acrobat Sign and similar tools.
Paste one prompt. Your agent builds your version.
Paste it into Claude Code, Codex or Cursor. Your agent reads the blueprint, asks how your company works and shows you a one-page plan. Once you approve it, the agent builds your version on SegmentStream, turns every invariant into a test and deploys when you say so.
Read https://github.com/segmentstream/build-your-own/blob/main/AGENTS.md and follow it.
Build our E-signature from the e-signature blueprint.What your agent builds
Envelopes, signers, a signing page and sealed, timestamped PDFs.
What it is not
- Not legal advice. The default is a simple electronic signature with strong evidence; whether that is enough for a given document or country is for your lawyer to confirm. Advanced or qualified signatures (for example under eIDAS) need a certificate provider; see the variations.
- Not a certificate authority. Your company holds no signing key by default; the seal comes from a public timestamp authority.
- No in-person signing, witnesses, notaries or bulk sending to thousands of people out of the box.
- Send one or more PDFs from your drive in one envelope, to signers, approvers and people who only need a copy, in the order you choose. Equal positions sign in parallel.
- People outside your company sign from an emailed link on any device. They need no account and see only what was sent to them.
- What people sign is frozen when you send it. Each signature records the fingerprint of every document the signer saw, so a swapped page is detected.
- Every send, email, view, signature, decline, void and seal is recorded with its time, the person, their IP address and browser. The record is append-only: no action edits it.
- Envelopes that need a manager’s or lawyer’s approval wait for it before they go out, and the approval is tied to the exact content that was approved.
- When the last person signs, each document becomes one sealed PDF: the original pages with the signatures in place, a certificate of completion, and an RFC 3161 timestamp that any PDF reader checks. It is stored as a new, unchangeable version of the document.
- Reminders, due dates, decline with a reason, and void by the sender happen on their own or in one click, and everyone concerned is told.
- Your workspace agent prepares envelopes, says who has not signed yet and sends reminders, always after you confirm. It never signs for anyone.
The hard parts are already running.
Your agent writes only the business logic. SegmentStream runs the infrastructure under it, so nobody on your team builds or operates it.
- File storage for the documents and sealed PDFs.
- A company database with a history of every view, signature and change, the base of the audit trail.
- The connection to a timestamp authority, with credentials kept by SegmentStream.
- Durable workflows for sending, reminders and sealing, and hosting for the signing page people outside your company open.
- DocuSign
- Adobe Acrobat Sign
- Dropbox Sign (formerly HelloSign)
- PandaDoc
- SignNow
- Zoho Sign
- BoldSign
- Yousign
- SignWell
- OneSpan Sign
Product names are trademarks of their owners, named only to describe what the blueprint can be compared with.
What’s in the blueprint
Five files your agent reads before it builds anything. Each opens on GitHub.
- BLUEPRINT.mdThe designRecords, actions, roles, workflows, data flow, screens and the build order.
- INTERVIEW.mdThe interviewWhat your agent asks about your company, and what each answer changes.
- INVARIANTS.mdThe invariantsRules that must hold in every version, each one a test in your project.
- VARIATIONS.mdThe variationsWhere companies legitimately differ, and the default for each.
- PITFALLS.mdThe pitfallsMistakes agents already made in production, so yours does not.
Blueprints are provided as is; see the disclaimer.
Related solutions
Build your company’s own software. Let agents run it.
$ segmentstream workspace create acme --region eu --subdomain acme
▸ Created workspace acme · database, warehouse and a private git repository
$ segmentstream workspace WORKSPACE-ID clone acme && cd acme
▸ your coding agent builds what your team asked for and runs the checks
$ git add -A && git commit -m "First version"
$ segmentstream deploy
▸ app, company agent, API and MCP tools live for your invited members
Our engineers build the first version on your data in two weeks, at a fixed price.
Or build it yourself with your coding agent:
curl -fsSL https://segmentstream.com/install.sh | sh