Work

What we build.

We'd rather show working software than promise it. This is our most complete case, and the one we use to prove the method.

Our own product

bb-sign: electronic signatures with verifiable evidence.

We built it end to end: a mobile-first signing ceremony, public document verification, a full audit trail and an API to plug it into your systems.

API: REST with an OpenAPI contract
SDK: Java and JavaScript
Webhooks: HMAC-signed
Accessible: WCAG AA in both themes

Explore bb-sign

The challenge

The signer has no account, no training and nobody to ask: just a link and a document they need to trust. And a third party must be able to prove, long after, that the signature is authentic.

What we built

A mobile-first signing ceremony, with the document visible before signing
One-time passcode (OTP) verification with controlled resend
Signing order for when signers must sign in sequence
Public verification of the sealed document, without signing in
A downloadable signed copy for every signer
Signed webhooks to learn about every event without polling
Interface in Spanish and English, with light and dark themes

How it is made

Services: Java microservices with Spring Boot
Interface: React and TypeScript
Data: PostgreSQL and S3-compatible storage
Events: RabbitMQ, event-driven choreography
Identity: Keycloak and OAuth 2.0 machine credentials
Observability: OpenTelemetry, Prometheus and Grafana

For developers

Your first envelope, in under 30 minutes.

Docs measured with real developers: if you have to ask, that's a bug in the docs.

Create an envelope with the bb-sign API

curl -s -X POST "$BBSIGN_BASE_URL/api/v1/envelopes" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "title": "My first envelope",
    "otpRequired": false,
    "expiresAt": "2026-12-01T00:00:00Z",
    "signers": [{"email": "someone@example.com", "name": "Someone", "signOrder": 1}]
  }'

Facing a similar challenge?

If your operation depends on documents, approvals or systems that don't talk to each other, let's talk.

Book a conversation