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Fiverr Pro
English
$
USD
I will build custom API integration, serverless backend, or webhook
Hariharan
About this gig
Need a reliable API, webhook flow, or backend integration for your product?
I build custom APIs, webhook systems, serverless backends, and third-party integrations for SaaS products, internal tools, and modern web applications. This gig is a good fit if you need clean backend logic, a secure integration flow, or help connecting services in a reliable way.
I can help with:
- Custom API development
- Third-party API integrations
- Webhook setup and processing
- Auth flows, API keys, and secure backend communication
- Serverless endpoints and backend logic
- Debugging and improving existing API integrations
My approach is focused on clean architecture, maintainable code, and real-world usability.
Whether you need a small API fix or a more complete backend integration, I aim to build solutions that are practical, scalable, and easy to work with.
What you can expect:
- Clean source code
- Reliable implementation
- Clear communication
- Performance-minded backend design
- Professional handling of your requirements
Please message me before ordering if your project includes multiple services or a larger backend scope, so I can recommend the right package.
Get to know Hariharan
Hariharan
Full Stack Architect
- FromIndia
- Member sinceApr 2026
Languages
English
I am a full-stack architect and Apple platform developer with experience building SaaS products, serverless backend systems, and native iOS/macOS applications. I am currently building PostMX, a developer-focused email testing platform, with work spanning product architecture, APIs, distributed backend design, caching, cloud infrastructure, and modern client experiences.
My Portfolio
FAQ
What kinds of APIs and integrations do you work on?
I work on custom APIs, third-party integrations, webhook flows, backend logic, auth flows, and serverless API systems for SaaS products, internal tools, and web applications.
Can you work with an existing codebase or fix an API issue?
Yes. I can debug and improve existing API integrations, fix endpoint issues, resolve webhook problems, and clean up backend logic where needed.
Do you build full backend systems or only small integrations?
Both. I can help with smaller API tasks as well as larger backend workflows, depending on the project scope and package.
Will I receive the source code?
Yes. All work is delivered with source code included unless we agree otherwise before the order starts.
Do you support third-party services and external APIs?
Yes. I can integrate external APIs and services as long as the documentation and access credentials are available.
Should I message you before placing an order?
Yes, especially if your project involves multiple services, custom business logic, or a larger backend scope. That helps me recommend the right package and avoid mismatched expectations.
Can you add authentication and secure API communication?
Yes. I can work on API keys, token-based auth, request validation, and secure backend communication depending on your setup.
Do you also handle database integration?
Yes, for packages where database work is included, I can connect backend logic to a database and structure the flow cleanly.
