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Fiverr Pro
English
$
USD
I will build and integrate secure rest apis with fastapi or nodejs
Ali H
About this gig
Need a secure API or reliable integration connecting your application with another business system?
I will build, integrate, fix, or improve production-ready backend APIs using Python, FastAPI, Node.js, Express.js, or NestJS.
With 7+ years of software engineering experience, I can help you with:
- REST and GraphQL API development
- Third-party API integrations
- Webhooks and workflow automation
- PostgreSQL, MySQL, MongoDB, and Redis integration
- Authentication and role-based authorization
- Payment, CRM, ERP, shipping, and business-system integrations
- Background jobs and asynchronous processing
- API debugging and performance optimization
- Validation, logging, and error handling
- Automated testing and API documentation
- Docker and cloud deployment
I have experience building enterprise integrations involving Oracle systems, QuickBooks Online, Stripe, and other external platforms.
You will receive clean, maintainable source code, secure implementation, clear documentation, and reliable communication.
API projects vary in authentication, endpoints, data mapping, rate limits, webhooks, and business rules. Message me before ordering so I can review the documentation and confirm the correct packa
Get to know Ali H
Ali H
Senior Full Stack AI Engineer
- FromPakistan
- Member sinceAug 2026
Languages
English
I help startups and growing businesses build secure, scalable web applications and AI-powered products. With 7+ years of experience, I specialize in Python, FastAPI, React, Next.js, TypeScript, Node.js, and PostgreSQL.
I can develop complete SaaS platforms, REST and GraphQL APIs, AI assistants, LLM and RAG solutions, third-party integrations, and cloud-ready applications. I also modernize existing systems, fix performance bottlenecks, and improve application architecture.
You’ll get clean code, clear communication, and a reliable solution built around your business goals.
Other Software Development Services I Offer
FAQ
Can you integrate an API into my existing application?
Yes. I can integrate third-party APIs into existing Python, FastAPI, Node.js, Express.js, NestJS, React, or Next.js applications.
Can you build a new API from scratch?
Yes. I can design and develop a REST or GraphQL API with database integration, validation, authentication, testing, and documentation.
Which third-party systems can you integrate?
I can integrate payment platforms, CRMs, ERPs, accounting systems, shipping services, AI providers, communication tools, and other platforms that provide suitable API documentation.
Can you fix an existing API integration?
Yes. I can diagnose authentication failures, incorrect data mappings, webhook issues, validation errors, performance problems, and unreliable synchronization.
Will you provide API documentation?
Yes. Documentation can include endpoint details, request and response examples, authentication instructions, error formats, and an OpenAPI or Swagger specification.
Can you implement authentication and security?
Yes. I can implement JWT, OAuth, API keys, role-based permissions, input validation, rate limiting, and other appropriate security measures.
Do you need access credentials?
Testing credentials may be required after the order starts. Please do not send passwords, API secrets, or production credentials in the initial requirements form.
Why should I message you before ordering?
API scope depends on endpoint complexity, authentication, documentation quality, data mapping, rate limits, webhooks, and business rules. A short review helps select the correct package.
