You will get REST API Development | Webhook Setup & Payment CRM Integrations
Project details
Silent API Failures Lose Data & Sales. Let's Build Integrations That Work.
Your web application shouldn't operate in a silo. It needs to sync seamlessly with payment processors, CRMs, email engines, and custom backends.
Having integrated 100+ APIs across different platforms, I build robust, self-healing backend systems equipped with failure retries, logging, and strict security protocol.
What I Build & Integrate:
• Custom REST APIs (Node.js/Express/Next.js): Built for scale with strict error handling, security middleware, and rate-limiting.
• Payment Gateways: Stripe (Charges, Subscriptions, Stripe Connect), PayPal, Razorpay, Square, and custom webhooks.
• CRM Systems: Salesforce, HubSpot (contacts, deals, workflows), Zoho, Pipedrive, and automated lead routing.
• Communication & Automation: SendGrid, Twilio, Mailgun, AWS SES, and custom Slack/Teams notification hooks.
• Authentication & Webhooks: OAuth 2.0 (Google, GitHub, LinkedIn logins), JWT tokens, Zapier/Make webhooks, and signature verification.
Share your current tech stack or API documentation, and I'll send over a custom project roadmap within 2 hours. Let’s build something scalable
Your web application shouldn't operate in a silo. It needs to sync seamlessly with payment processors, CRMs, email engines, and custom backends.
Having integrated 100+ APIs across different platforms, I build robust, self-healing backend systems equipped with failure retries, logging, and strict security protocol.
What I Build & Integrate:
• Custom REST APIs (Node.js/Express/Next.js): Built for scale with strict error handling, security middleware, and rate-limiting.
• Payment Gateways: Stripe (Charges, Subscriptions, Stripe Connect), PayPal, Razorpay, Square, and custom webhooks.
• CRM Systems: Salesforce, HubSpot (contacts, deals, workflows), Zoho, Pipedrive, and automated lead routing.
• Communication & Automation: SendGrid, Twilio, Mailgun, AWS SES, and custom Slack/Teams notification hooks.
• Authentication & Webhooks: OAuth 2.0 (Google, GitHub, LinkedIn logins), JWT tokens, Zapier/Make webhooks, and signature verification.
Share your current tech stack or API documentation, and I'll send over a custom project roadmap within 2 hours. Let’s build something scalable
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, W3C Markup Validation ServiceWhat's included
| Service Tiers |
Starter
$250
|
Standard
$650
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 4 days | 8 days | 15 days |
Number of Revisions | 2 | 4 | 6 |
Design Customization | |||
Content Upload | - | - | - |
Responsive Design | - | ||
Source Code | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100 - $400
Additional Revision
+$80
Responsive Design
(+ 1 Day)
+$80
Source Code
(+ 1 Day)
+$80Frequently asked questions
About Khurram
AI Full Stack Engineer | React, Next.js, Node.js | SaaS, API & Chatbot
Birmingham, United Kingdom - 8:01 am local time
I'm building my Upwork track record from scratch, early clients get senior-level delivery at a rate that reflects a developer
still earning reviews, not coasting on them.
I build with React, Next.js, and Node.js, and integrate AI where it
earns its place: chatbots that hold real customer conversations, RAG
systems that let AI search your own documents, and automation that
removes hours of manual work, built into your product, not bolted on.
WHAT I BUILD
- SaaS platforms and MVPs, from rough brief to production app
- AI chatbots and agents (OpenAI API, Anthropic Claude, LangChain, RAG)
- Custom web applications, admin dashboards, and internal tools
- Third-party API, CRM, and payment integrations (Stripe, PayPal)
- Performance fixes and refactors for slow or fragile codebases
STACK
Next.js, React, TypeScript, Node.js, Supabase, PostgreSQL, REST &
GraphQL APIs, OpenAI API, Anthropic Claude, LangChain, n8n
INDUSTRIES
Healthcare & HealthTech (compliance-first builds), Real Estate,
E-commerce & marketplaces, EdTech, Logistics & Aviation, CRM & business
automation
I work directly on every project I take, you're not handed off to a
junior. I flag risks and trade-offs before they become problems, and
give honest advice even when the simpler option means less billable
work for me.
Send me a short description of your project and where you're stuck.
I'll reply within a few hours with honest thoughts on approach,
timeline, and fit.
Steps for completing your project
After purchasing the project, send requirements so Khurram can start the project.
Delivery time starts when Khurram receives requirements from you.
Khurram works on your project following the steps below.
Revisions may occur after the delivery date.
Spec Mapping & Sandbox Setup
Review third-party API specs, configure environment keys, and map incoming/outgoing data schemas.
Authentication & Base Endpoints
Build base REST endpoints, setup OAuth 2.0 / JWT handling, and configure secure environment variables.