Api integration development

Freelance Role: Backend API Integration Developer (AI Search System)

Overview

We are seeking an experienced backend developer to integrate an existing website with multiple AI APIs to enable AI-powered search and response functionality.

This is a backend-only role. No frontend development is required.

The system must connect to and coordinate responses from:

* OpenAI API (ChatGPT)
* Grok API
* GitHub Copilot (or equivalent AI-assisted development tooling where applicable)

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Scope of Work

* Integrate AI APIs into existing website backend
* Enable AI-powered search functionality via API requests
* Route user queries between multiple AI systems based on logic rules
* Build secure API authentication handling (API keys, OAuth2, JWT where required)
* Process, transform, and return structured JSON responses to the website
* Implement request validation and error handling
* Handle rate limits, retries, and API failures
* Ensure stable, scalable, production-ready performance
* Secure all API communications and data handling

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Required Skills (Strict)

Applicants must have strong experience in:

* REST API development and integration
* Backend development (Node.js, Python, or equivalent)
* Working with LLM or AI APIs in production
* JSON schema design and structured data handling
* Authentication systems (API keys, OAuth2, JWT)
* Webhooks and asynchronous request handling
* Debugging complex API systems independently
* Building production-ready backend services

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Additional Required Skills

Candidates must also have experience with:

* API orchestration or multi-service routing systems
* Middleware or backend abstraction layers
* Cloud deployment (AWS, DigitalOcean, or VPS environments)
* Logging and monitoring systems for API usage
* Rate limiting and API failure recovery strategies
* Basic system architecture design
* Security best practices for API-based systems

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Nice to Have

* Experience with AI workflow automation or agent systems
* Experience integrating multiple LLM providers in one system
* Familiarity with vector databases or embeddings
* Experience with caching strategies (Redis or similar)
* Experience building SaaS backend infrastructure
* Knowledge of prompt engineering or AI response structuring

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Deliverables

* Fully working AI API integration with existing website
* Multi-API routing system (ChatGPT + Grok + fallback logic)
* Secure backend architecture for API handling
* Structured response system (JSON-based outputs)
* Documentation of all endpoints and system design
* Basic monitoring or logging system for API usage

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Engagement Type

* Freelance / contract basis
* Fixed project or milestone delivery
* Optional ongoing maintenance available after completion

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Application Requirements

Please include:

* Examples of API integrations you have built
* Experience with AI/LLM systems
* Backend technologies you are proficient in
* Description of a complex API system you have built or maintained
* Estimated timeline for delivery
* Hourly rate or fixed project quote