Yesso

Our own SaaS product: email-based approval workflow platform with magic link auth, multi-tenant architecture, and sub-100ms load times. Approve requests in under 30 seconds, no login required.

The Challenge

Most approval tools are either too heavy (full workflow suites that take a month to implement) or too light (shared spreadsheets and Slack bots that don't scale). The goal was a tool simple enough to start using in an afternoon but robust enough to handle multi-tenant organizations, complex approval chains, and audit requirements. The technical challenge was making magic link auth feel effortless while keeping the backend stateless and production-ready.

Our Approach

We built on Next.js 15 with the App Router, using static generation for all public pages to hit sub-100ms TTFB globally via Vercel's edge network. Clerk handles authentication including magic link generation. Prisma with Supabase PostgreSQL provides type-safe queries with multi-tenant architecture from day one — every table includes organizationId for data isolation. Soft deletes via deletedAt timestamps handle audit compliance. The lazy initialization pattern for Resend and all service clients prevents build failures on Vercel. TypeScript caught 4 breaking changes when Next.js 15 changed route handler params to async Promises.

The Result

A production-ready SaaS platform achieving sub-100ms load times globally. 90+ Lighthouse on all public pages. Magic link auth that genuinely removes friction — approve a PTO request from your phone in the time it takes to read the email. Multi-tenant architecture that scales to thousands of organizations without refactoring. Releasing 2026.

Static Generation at the Edge

All public pages are pre-rendered at build time and served from Vercel's global edge network. No server cold starts, no database calls on page load. Sub-100ms TTFB worldwide, even on the first visit.

Magic Link Auth

Approvers never create an account. A Clerk-generated magic link arrives in their inbox, they click once, the request resolves. The entire approval flow completes in under 30 seconds with zero onboarding.

Multi-Tenant from Migration 1

Every table includes organizationId as a foreign key from the first schema. Data isolation is enforced at the query level via Prisma, not application logic. Scales to thousands of organizations without a single refactor.

TypeScript End-to-End

Prisma auto-generates TypeScript types from the database schema. Next.js validates route params at compile time. This caught 4 breaking changes when Next.js 15 changed route handler params to async Promises — all at build time, none in production.