Productivity App with Node.js API

## Mobile App + Node.js Backend API Integration

We are looking for an experienced developer to integrate third-party APIs into a mobile application with a Node.js backend.

This is a production-level project — clean architecture, scalability, and reliability are important.

### Scope of Work

* Integrate external REST APIs into a **Node.js backend**
* Connect backend APIs to a **mobile application**
* Handle authentication, error handling, and response optimization
* Ensure secure API communication
* Implement clean, maintainable code structure
* Write basic documentation for integration

### Tech Stack

* Node.js (Express or similar)
* REST APIs
* Mobile app integration (Flutter / React Native / Native — specify your experience)
* JSON / Webhooks
* Git-based workflow

### Requirements

* Strong experience with Node.js backend development
* Experience integrating third-party APIs
* Understanding of authentication methods (JWT, OAuth, API keys)
* Clean and scalable coding practices
* Ability to communicate clearly and deliver on time

### Bonus

* Experience with payment APIs / blockchain APIs
* Experience optimizing API performance
* DevOps deployment experience

### Deliverables

* Fully integrated and tested API connections
* Clean backend structure
* Deployment-ready build
* Short documentation