backend

Legacy API Migration to Node.js

Migrated a legacy PHP REST API to a modern Node.js/Express architecture with zero downtime.

Node.jsExpressMongoDBDockerJestSwagger

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The Problem

A SaaS company's PHP API was difficult to maintain, had no documentation, and couldn't scale to handle 10x traffic growth.

The Solution

Designed and implemented a new Node.js API with Express, comprehensive Swagger docs, automated testing with Jest, and a gradual migration strategy using API versioning.

Impact

API response times improved by 60%. Development velocity doubled thanks to better tooling and documentation.

Challenges

Ensuring backward compatibility during migration. Used API versioning and feature flags to gradually switch endpoints without breaking existing clients.

Outcome

Zero-downtime migration completed over 4 weeks. All existing integrations continued working seamlessly.

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