I will develop or improve your nodejs express or nestjs backend API

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tahirniacci
T
tahirniacci
Hassan K
develop or improve your nodejs express or nestjs backend API
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develop or improve your nodejs express or nestjs backend API
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develop or improve your nodejs express or nestjs backend APIdevelop or improve your nodejs express or nestjs backend API

About this gig

I help SaaS founders, startups, agencies, and businesses with incomplete backends build and improve reliable Node.js, Express, and NestJS APIs.


What I can do for you:

Design and build REST APIs from scratch

Add authentication and role-based permissions

Build CRUD modules with validation and error handling

Integrate MongoDB or PostgreSQL

Document your API with Swagger

Debug and improve an existing backend


I focus on understanding your business workflow before writing code, so the API you get is structured, maintainable, and ready for production.


Basic covers one API module or a focused bug fix. Standard covers a complete business module with database integration. Premium covers a multi-module backend with authentication, role-based access, and documentation.


Before we start, please share any API documentation or codebase access, your expected workflow, and your authentication requirements so I can scope the work accurately.

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases

  • Programming language

    • JavaScript

  • Backend framework

    • Express.js
    • NestJS
    • Node.js

Get to know Hassan K

Hassan K

Backend Engineer for Nodejs NestJS APIs Webhooks and Integrations

  • FromPakistan
  • Member sinceMar 2025
  • Avg. response time1 hour

  • Languages

    English
Backend software engineer with about four years of experience building REST APIs, SaaS backends, third-party integrations, and payment workflows. Stack: Node.js, Express, NestJS, TypeScript, MongoDB, PostgreSQL, and Redis. Experience spans healthcare, education platforms, CRM automation, and communication systems, including Stripe, HubSpot, Twilio, Retell AI, Firebase, AWS SES, Redox, FHIR, and ModMed. I handle new backend development plus debugging, refactoring, and performance work on existing systems, focusing on business workflow first to deliver maintainable, production-ready backends.

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