E-signature platform with its own SDK
A digital signature platform built as a standalone product: Next.js backend, versioned React SDK and legally valid sealing to ETSI CAdES.
CAdES
ETSI-compliant sealing
SDK
published React package
3.1
OpenAPI as source of truth
Starting point
The second product we built with LohnLab: for document workflows with legally valid signatures, the team needed its own e-signature solution - flexible enough to be embedded into several products instead of being tied to an external provider.
Approach
We built the platform as a monorepo: a Next.js backend for documents, signing flows, templates and webhooks - plus a headless React SDK, typed from an OpenAPI specification and published with versioned releases through CI/CD.
Result
PDF upload, field placement, sequential and parallel signing, sealing to ETSI CAdES, audit trails and webhooks - a product any LohnLab frontend can embed through the SDK.
$git log --graph
mainnext: your-product
Ready to build your product?
Tell us briefly about your idea - we'll turn it into a clean, scaling product.