What is SignStack?

SignStack is a developer-first, API-driven platform for intelligent agreement automation. Think of us as the "Stripe for Agreements" – we provide the powerful, flexible infrastructure that lets you embed complex, data-driven document and e-signature workflows directly into your own applications, faster and more reliably than ever before.

We're not just another e-signature tool. We're a "headless" engine designed from the ground up to be a core part of your platform, providing a seamless experience for your users.

Why SignStack? Designed for Developer Productivity.

Building robust agreement automation is often a messy, time-consuming distraction that pulls focus from your core product. Traditional tools force you to scatter fragile field-mapping logic throughout your application code or embed clunky, third-party UIs. SignStack offers a fundamentally cleaner architecture built for modern development:

• Bridge the Gap Between Your Data and Documents: Our unique "data-first" architecture revolves around canonical Entities. You work with the clean business objects you're already familiar with in your own backend (like ClientInfo or DealInfo); SignStack handles the complex logic of mapping that data onto documents. Use the powerful, open-source JSONata expression engine to dynamically control field visibility and pre-populate field values directly from your entities, even combining data across objects.

  • Example: Calculate a "Priority Support Fee" field: "$formatNumber(ClientInfo.tier = 'Enterprise' ? DealInfo.value * 0.05 : 0, '$,0.00')" without writing any backend code.

• Encapsulate Logic in Declarative Blueprints: Define your entire business process—documents, participants, conditional logic, multi-step sequences, parallel approvals, and data transformations—as a single, declarative JSON Blueprint. This encapsulates the workflow logic within SignStack, keeping your application code clean and focused. It's truly "infrastructure as code" for your agreements – versionable, auditable, and portable.

  • Example: A Blueprint can define a rule: "If DealInfo.value > 100000, include the 'VP_APPROVAL' step, which requires signatures from any 2 out of the 5 VPs defined in the parallel step."

• Deliver a Truly Native Experience: Because SignStack is a headless, API-first engine, you can build the entire agreement workflow natively inside your own application using our embeddable web components or directly against the API. Provide your users with a completely seamless, white-label experience that feels like an integrated part of your product, not a bolted-on third-party tool.

  • Example: Embed the <signstack-signing-ceremony> component directly into your React or Angular app, styled with your own CSS.

• Test End-to-End with Realistic Scenarios: Because your workflow logic (including data transformations) is encapsulated within SignStack, testing becomes fast and reliable. Create reusable Scenarios (with optional AI assistance) to test your entire end-to-end

  Blueprint

  logic against realistic data sets, ensuring high confidence before you ship. Catch edge cases during design time, not in staging or production.

  • Example: Define a "High Value Deal with International Client" Scenario and instantly preview how your Blueprint behaves with that specific data set, including conditional steps and dynamic document content.

• Guaranteed Data Integrity with Schemas: Stop worrying about invalid data corrupting your workflows or causing runtime errors. Every piece of data entering or evolving within SignStack is validated against explicit Schemas, built on the open JSON Schema standard, that you define and control, ensuring robustness and predictability at every step.

  • Example: Define a ClientInfo schema requiring email to be a valid email format and countryCode to be a valid ISO code. SignStack automatically enforces this.

• Less Code to Maintain, Audit, and Secure: By abstracting the complex workflow orchestration, state management, data transformation, document rendering, secure signing, and auditable history into the SignStack engine, you write significantly less code. This means a faster time-to-market, reduced maintenance burden, simplified audits, and a smaller security surface area for your team to manage.

Who is SignStack For?

SignStack is built for developers and product teams who are:

• Building Custom SaaS Applications (especially Vertical SaaS): Embed seamless, white-label agreement workflows directly into your product.

• Need Deep, Data-Driven Automation: Move beyond simple field mapping and build intelligent, reactive processes that evolve based on real-time data and complex business rules.

• Frustrated by Rigid, UI-Centric Platforms: Want a powerful, transparent, "headless" engine designed for professional developers, not a "black box" no-code tool.

• Developing AI Workflow Orchestration Platforms: Need a secure, auditable, and API-driven way for your AI agents to incorporate the essential human element—legally binding signatures, approvals, and complex form data collection—into their automated processes. SignStack is the high-trust interaction engine for your agentic flows.

Ready to Get Started?

This guide will walk you through the core concepts and get you running your first workflow in under 5 minutes. Let's dive in!

➡️ Next: Quick Start: Your First Workflow