White-label SaaS for virtual queues

A new product built from scratch: a multi-tenant, white-label SaaS platform to manage virtual queues for any organization that serves the public.

Each organization has its own branches, services and staff, plus a branded experience for its customers. The product includes the public app to take a ticket, the service desk for staff, an admin panel for each organization and a back office for the platform operator.

Get rid of physical lines. People take a ticket from their phone, follow their position in real time and get notified when they are called.

The technical challenge had three parts: updating ticket positions and service panels in real time, isolating each organization's data, and modeling a hierarchical configuration (organization → branch → service) with different prioritization rules.

• Bootstrapped the frontend and built the design system and component kit, with light/dark themes and configurable white-label branding.
• Public flow: take a ticket, email code verification, live position, ticket recovery, rating and optional push notifications.
• Service desk: call next, pause, transfer and reorder tickets with drag & drop, plus the public call screen.
• Organization admin: branches with opening hours, services, staff, operational settings and hierarchical prioritization.
• Platform back office: organizations, plans, accounts and audit logs.
• Backend: JWT authentication, accounts and roles, auditing, the hierarchical configuration model and service operations (pause, transfer, reorder, async calling).
• Spanish/English internationalization, dashboards with charts and a map of nearby branches.
• Local infrastructure with Docker Compose, plus process documentation.

• Proposed Server-Sent Events instead of WebSockets for real-time updates: traffic is almost entirely server-to-client, and SSE is simpler to run.
• Organized the frontend by feature and built the design system from day one.
• Defined how the AI-DLC methodology (AI-assisted development) is applied in the project, from requirements to delivery.

• Protecting access to tickets with email code verification, without requiring the public to sign up.
• Keeping the customer view and the staff view in sync in real time.
• Designing configuration inheritance across organization, branch and service.

Monorepo with a SPA frontend and a monolithic Spring Boot REST API, using Server-Sent Events for real time and scheduled background jobs.

Backend unit and integration tests (JUnit, Testcontainers, property-based tests), frontend component tests (Vitest + Testing Library) and end-to-end tests with Playwright, all running in CI.

Reached a working end-to-end MVP.

Backend with Spring Boot and modern Java, real time with SSE, multi-tenant architecture, building a design system and AI-assisted development with AI-DLC.