You will get REST API Development & Third-Party Integration Expert
Top Rated
Top Rated
Project details
I'll build reliable, secure, and scalable REST APIs that power modern applications and business workflows for you.
I develop custom backend systems using Node.js, Express, Next.js, PostgreSQL, MongoDB, and cloud services. Whether you need new API endpoints, third-party integrations, webhook systems, payment integrations, CRM connectivity, or custom backend architecture, I can deliver production-ready solutions.
I focus on maintainable code, security best practices, performance optimization, and scalable architecture that can support future growth.
Popular integrations include Stripe, OpenAI, Google APIs, HubSpot, Salesforce, Slack, Shopify, Twilio, SendGrid, and many other third-party platforms.
I develop custom backend systems using Node.js, Express, Next.js, PostgreSQL, MongoDB, and cloud services. Whether you need new API endpoints, third-party integrations, webhook systems, payment integrations, CRM connectivity, or custom backend architecture, I can deliver production-ready solutions.
I focus on maintainable code, security best practices, performance optimization, and scalable architecture that can support future growth.
Popular integrations include Stripe, OpenAI, Google APIs, HubSpot, Salesforce, Slack, Shopify, Twilio, SendGrid, and many other third-party platforms.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$125
|
Standard
$275
|
Advanced
$800
|
|---|---|---|---|
| Delivery Time | 2 days | 6 days | 10 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | |||
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
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PS
Pushpak S.
Jan 24, 2026
Full Stack Intern / Full-Time Developer (Compensation: 250 USD/Month)
MM
Mark M.
Oct 30, 2025
Stripe integration to Next/Node
Exceptional developer! The Stripe setup was flawless, and they went the extra mile to fine-tune every aspect for performance and user experience. A truly top-tier developer who makes complex work look effortless. Couldn’t recommend more highly.
MM
Mark M.
Oct 5, 2025
AI automation + workflow for an existing application (Zapier + OpenAI)
The AI automation and workflow integration for our existing application was executed flawlessly. It runs smoothly, saves time, and fits our workflow perfectly. Overall, an outstanding job that exceeded expectations!
MM
Mark M.
Sep 1, 2025
Migrate from legacy authentication to NextAuth + Update some APIs
I'm working with freelancers for over 12 years on all platforms and i never had such a great experience. He thinks and helps you like he's your real partner, not someone you hired. Absolute pleasure to work with, highly knowledgeable and professional at all times. Great attention to detail and prepared to help you on every step with recommendations so you feel safe all the time. I will hire him again for sure.
MM
Mark M.
Aug 28, 2025
Help me complete the project over the weekend (Next/Node), up to 6$/h only
What an exceptional experience this was! Muhammad is a magician at work. You mostly work with juniors, have sometimes a chance to work with some seniors, but this guy is two steps above seniors. If you have any work on backend, this is the guy you want to have. No AI, the code is clean and he is incredibly fast. We have already scheduled another project with him. Highly recommended.
About Hasnaat
Full Stack Engineer | Next.js, Node.js, TypeScript, Python | AI & SaaS
100%
Job Success
Toba Tek Singh, Pakistan - 9:00 am local time
Specializing in Full Stack Development and AI integrations, I deliver end-to-end product builds using Next.js, Node.js, Typescript, Python, MongoDB, Supabase, Stripe. I also handle AI integrations and AI powered features using Python, LangChain, and LLMs.
Whether you need an AI powered tool, SaaS applications, multi-tenant support, custom AI agents, chatbots, RAG pipelines or intelligent automation workflows, I turn your idea into a live product.
I own the full pipeline: Concept → Planning → Architecture → Design → Development → Testing → Deployment.
I can help with:
• Full Stack Development using React, Next.js, Node.js and TypeScript
• SaaS Application Development and MVP Development
• Custom Web Applications and Platform Development
• REST API Development and API Integration
• AI Agents, Chatbots and RAG Pipelines
• Database Design (PostgreSQL, MongoDB, Supabase)
• Stripe, Payment Gateway Integration, Billing Systems
• Authentication and secure web platforms
• Docker Deployment and Cloud Infrastructure
How I work:
I prioritize clear communication, realistic timelines, and maintainable code.
You'll receive:
• Clearly defined scope and milestones
• Regular progress updates
• Clean, documented, production-ready code
• Scalable architecture designed for future growth
• Reliable delivery and long-term support
If you're building an AI product or SaaS platform and need a reliable engineering partner, feel free to reach out. Send me a message with what you are looking for and we can schedule a free 15 min call to discuss it.
Core Stack:
JavaScript • Next.js • React • Node.js • Python • TypeScript • Tailwind • MongoDB • PostgreSQL • OpenAI • Gemini • Claude • LangChain • RAG • Pinecone • AWS • Docker
Steps for completing your project
After purchasing the project, send requirements so Hasnaat can start the project.
Delivery time starts when Hasnaat receives requirements from you.
Hasnaat works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & Architecture Review
API Development & Integration