# ApexFlow

A CRM and analytics dashboard: Angular 19 with Signals and RxJS on the frontend, Spring Boot 3 and PostgreSQL on the backend.

Stack: Angular, Signals, RxJS, PrimeNG, Spring Boot, PostgreSQL

## Links

- Demo: https://dashboard-tesi.vercel.app/welcome

## Context

For my Computer Engineering thesis I wanted a project with real problems to solve. ApexFlow simulates a SaaS platform that a tech company would use to manage customers, subscriptions, products and orders, with the constraints of a production system.

## How it is built

- Angular 19 single-page app with standalone components and Signals for state.
- PrimeNG for data-heavy components: tables, forms, dialogs and toasts.
- Role-based access with route guards (admin-only settings, profile pages limited to the owner or an admin).
- HTTP interceptors that attach the bearer token and turn API errors into toast notifications in one place.
- Spring Boot 3 REST API on Java 21 with Spring Data JPA, PostgreSQL and Docker; frontend on Vercel, backend on Render.

## Key decisions

### Signals for state, RxJS where time matters

Authentication state lives in signals, so the components never subscribe or unsubscribe by hand. RxJS stays where it is the right tool: debouncing filters and cancelling stale requests.

### Server-side tables with one reusable state class

A TablePaginationState class keeps page, sort and filters in the URL and bridges signals and observables with toSignal and toObservable. Changing a filter or a page triggers exactly one API call, and every table in the app reuses the same logic.

### Spring Boot instead of a JavaScript backend

NestJS would have kept everything in TypeScript, but Spring Boot is what most of the job posts I read asked for next to Angular. With two languages, the contract between client and server has to be explicit: every field the frontend relies on is a decision.

## Outcome

I graduated in April 2026 with ApexFlow as my thesis. The live demo has one-click demo accounts for an admin and a regular user.

Emanuele Del Monte, Frontend Engineer: https://www.emanueledelmonte.it/en/