Unified API for Multi-Platform Operations

Centralising business logic into a single backend so web, mobile, and internal tools stay in sync and evolve without breaking.

The problem

The client’s mobile app, CRM, website, and internal tools all used separate logic and inconsistent data. Every feature update meant touching multiple codebases, which led to conflicts, downtime, and duplicated work. They needed a single, reliable backend that could serve all platforms consistently.

What I built

• Designed a versioned REST API that exposes core business entities and workflows.
• Centralised authentication, permissions, and validation rules in one place.
• Implemented caching and rate limiting to keep responses fast and protect upstream services.
• Documented endpoints in a human-friendly way so other teams could build against the API safely.

Impact

• New features now ship to web and mobile with a single backend change.
• Support tickets related to “data mismatch between systems” dropped significantly.
• The API became the foundation for future products without rewriting core logic.