PN
Case Study

Café Digital Growth & Operations Platform

End-to-end system for customer engagement, retention, and business operations

ReactNode.jsExpress/KoaMySQLREST APIJWT AuthCloud Deployment

Problem

Most independent cafés rely on static websites or social media, with no structured way to retain customers, run promotions, or manage internal workflows like hiring. This leads to missed revenue opportunities, low customer retention, and inefficient manual processes.

Approach

Designed and built a modular full-stack system focused on two core areas: (1) customer engagement and retention, and (2) internal business operations. The platform provides an intuitive frontend experience while exposing structured backend services for loyalty tracking, promotions, hiring workflows, and customer data management.

Architecture

Decoupled client-server architecture with a RESTful API backend and a responsive SPA frontend, designed for scalability and maintainability.

1

Frontend (SPA)

React-based interface with mobile-first design, smooth navigation, and user-focused flows for browsing, engagement, and interaction.

2

Backend API

RESTful API with structured resource design, handling authentication, business logic, and secure data access.

3

Authentication & Security

JWT-based authentication with role-based access control for admin and user-level permissions.

4

Database Layer

Relational schema (MySQL) supporting users, loyalty data, promotions, job applications, and customer interactions.

5

Deployment

Cloud-hosted frontend with scalable backend services, designed for real-world usage and extension.

Key Engineering Decisions

Business-first feature design

Prioritized features that directly impact revenue and operations (loyalty, promotions, hiring) rather than building a static informational website.

Decoupled architecture (SPA + API)

Separated frontend and backend to allow independent scaling, cleaner code structure, and easier future integrations.

JWT-based authentication

Implemented secure authentication with role-based access to ensure admin-only control over sensitive operations like job management and data access.

Modular feature system

Built the system in independent modules (loyalty, promotions, hiring), allowing features to be extended or customized per business needs.

Security Considerations

Implemented authentication and authorization controls to restrict sensitive operations. Input validation and structured API design ensure data integrity and prevent unauthorized access.

Testing Strategy

API endpoints were tested for authentication, authorization, and edge cases. Core user flows (login, interaction, data submission) were validated to ensure reliability in real-world scenarios.

Outcome

Delivered a production-ready system that transforms a café website into a business tool. The platform enables customer retention through loyalty systems, supports operational workflows such as hiring, and provides a scalable foundation for future features like analytics and marketing automation.

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