What Powers PaperLink - Our Tech Stack

PaperLink runs on 20+ open-source and commercial technologies. Here is every piece of the stack and what it does for the product.

No version numbers on this page - that is a deliberate security practice.

Core Platform

Technology	Role
Next.js	Full-stack framework. Server-side rendering, static pages, and API routes in one codebase.
React	UI library. Every screen, form, and dashboard component.
TypeScript	Strict-mode type safety across the entire project. Catches bugs before they reach production.
Tailwind CSS	Utility-first styling. Fast to build, zero runtime CSS overhead.
Node.js	Server runtime. Powers all backend logic and document processing.
Zod	Schema validation at every system boundary - API inputs, form data, external responses.

Data and Infrastructure

Technology	Role
PostgreSQL	Primary database. Stores users, teams, documents, invoices, and all business data.
Prisma	Type-safe ORM. Generates queries from schema, prevents SQL mistakes, handles migrations.
Vercel	Hosting platform. Serverless functions, edge network, automatic deployments from Git.
Auth.js	Authentication. Sign in with Google, LinkedIn, or Telegram - no passwords to manage.
Resend	Transactional email. Welcome messages, sharing notifications, document alerts.
Sentry	Error monitoring. Catches exceptions in real time so we fix problems before users notice.
Vercel Blob	File storage. Uploaded PDFs and documents stored on a global CDN.

AI and Analytics

Technology	Role
Anthropic Claude	AI engine. Generates document insights, analyzes viewer engagement patterns.
PostHog	Product analytics. Tracks feature usage, funnels, and user behavior to guide development.
Tinybird	Real-time analytics pipeline. Processes document view events at scale - page-by-page tracking, heatmaps, engagement metrics.
Vercel Analytics	Web performance. Core Web Vitals monitoring and page load tracking.

Testing and UI

Technology	Role
Vitest	Unit and integration testing. Runs thousands of tests in seconds.
Playwright	End-to-end browser testing. Verifies complete user flows across Chrome, Firefox, and Safari.
Headless UI	Accessible UI primitives. Dropdowns, modals, and menus that work with screen readers out of the box.
Recharts	Data visualization. SVG-based charts for dashboards and analytics views.

Architecture

PaperLink follows Clean Architecture with four layers - Domain, Application, Infrastructure, and Presentation. Business logic lives in the inner layers, completely independent of frameworks and databases. Automated architecture tests enforce these boundaries on every commit.

Why This Matters for You

A strong tech stack is not about bragging rights. It translates directly to the product you use:

• TypeScript + Zod means fewer bugs reach your account
• Sentry means we know about errors before you report them
• Playwright means features work across all browsers
• PostgreSQL + Prisma means your data is stored safely with proper migrations
• Clean Architecture means we ship new features faster without breaking existing ones

PaperLink is built for reliability. The stack reflects that.