You will get Scalable Backend Development — Node.js, MongoDB, REST API Integration
Top Rated
Top Rated
Project details
Need a fast, reliable, and scalable backend for your web or mobile app? I specialize in building robust server-side solutions using Node.js, Express.js, and MongoDB with secure, high-performing REST APIs.
Whether you're building a new platform from scratch or improving an existing one, I will develop a backend that’s optimized for speed, security, and scalability.
🔧 What I Offer:
✔️ Custom REST API development (CRUD, auth, file upload, etc.)
✔️ Express.js server setup with scalable routing
✔️ MongoDB integration with Mongoose
✔️ User authentication (JWT, OAuth2.0, session-based)
✔️ Role-based access control (RBAC)
✔️ Third-party API integrations (e.g., Stripe, Firebase, Twilio)
✔️ Realtime features using WebSockets (Socket.IO)
✔️ Error handling, logging, and request validation
✔️ Deployment & version control using Git, GitHub, Render, or Vercel
⚙️ Technologies & Tools Used
✔️Languages: JavaScript (Node.js)
✔️Frameworks: Express.js
✔️Database: MongoDB + Mongoose
✔️Auth: JWT, OAuth, Firebase Auth
✔️Deployment: Render, Heroku, Vercel, Railway
✔️Others: GitHub, Postman, Swagger (API Docs), Socket.IO
Whether you're building a new platform from scratch or improving an existing one, I will develop a backend that’s optimized for speed, security, and scalability.
🔧 What I Offer:
✔️ Custom REST API development (CRUD, auth, file upload, etc.)
✔️ Express.js server setup with scalable routing
✔️ MongoDB integration with Mongoose
✔️ User authentication (JWT, OAuth2.0, session-based)
✔️ Role-based access control (RBAC)
✔️ Third-party API integrations (e.g., Stripe, Firebase, Twilio)
✔️ Realtime features using WebSockets (Socket.IO)
✔️ Error handling, logging, and request validation
✔️ Deployment & version control using Git, GitHub, Render, or Vercel
⚙️ Technologies & Tools Used
✔️Languages: JavaScript (Node.js)
✔️Frameworks: Express.js
✔️Database: MongoDB + Mongoose
✔️Auth: JWT, OAuth, Firebase Auth
✔️Deployment: Render, Heroku, Vercel, Railway
✔️Others: GitHub, Postman, Swagger (API Docs), Socket.IO
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, PSD to HTML, Performance OptimizationWhat's included
| Service Tiers |
Starter
$129
|
Standard
$349
|
Advanced
$599
|
|---|---|---|---|
| Delivery Time | 2 days | 5 days | 9 days |
Number of Revisions | 2 | Unlimited | Unlimited |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
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YC
Yash C.
Oct 31, 2025
Expert React & Strapi Developer for Web Application
Kashyap was absolutely wonderful, he is an amazing person to work with, he goes above and beyond to complete the project deliverables without compromising the quality of the code. Recommended to. everyone.
SN
Sparsh N.
Oct 3, 2025
Front-End Web Developer for Web App Project
Great experience working with him! He handled the front-end and parts of the backend with solid proficiency and delivered quality work. Very responsive, knowledgeable, and easy to work with — highly recommended.
JL
Jose L.
Jun 11, 2025
Cloudflare Workers Developer for Dynamic SEO Pages on Firebase + React App
great work ethic!
About Kashyap
Next.js Expert | Full-Stack SaaS Developer | AI & LLM Integration
100%
Job Success
Surat, India - 9:05 am local time
I help startups, SaaS founders, agencies, and businesses build secure, high-performance platforms including SaaS MVPs, admin dashboards, CRM/CMS systems, AI tools, automation workflows, API integrations, and mobile apps with a strong focus on clean UI/UX, scalable backend architecture, and reliable delivery.
4+ years of experience, Top Rated profile, 99%+ client satisfaction, and a strong track record of building business-ready web and mobile applications.
💡 What I Build For You:
✅ AI-powered SaaS platforms and MVPs with multi-tenant architecture, Stripe billing, RBAC, row-level security, and scalable backend structure
✅ Full-stack web applications using Next.js, React.js, Node.js, Express.js, MongoDB, PostgreSQL, Supabase, and Firebase
✅ Admin dashboards, CRM, CMS, internal tools, reporting systems, and business workflow platforms
✅ AI agents, RAG systems, AI chatbots, and intelligent automation using OpenAI, Claude, Gemini, LangChain, and custom business logic
✅ Secure REST API and GraphQL API development with webhooks, third-party integrations, and scalable service-layer architecture
✅ Payment and subscription systems using Stripe, Stripe Connect, Razorpay, PayPal, invoices, webhooks, and role-based access
✅ Supabase apps with Auth, RLS policies, Edge Functions, Realtime, Storage, and database migrations
✅ React Native mobile applications for iOS and Android with authentication, API integration, push notifications, forms, and dashboards
✅ API and system integrations with CRMs, ERPs, SaaS tools, automation platforms, and legacy codebases
✅ SEO-friendly, performance-focused Next.js websites with clean UI/UX.
🛠️ Frontend & Mobile App Development:
✅ Next.js, React.js, JavaScript, TypeScript, Redux Toolkit
✅ Tailwind CSS, responsive UI systems, reusable components, and clean design implementation
✅ Next.js SSG/ISR, dynamic routes, SEO-friendly pages, and performance-focused frontend architecture
✅ React Native, Expo, and React Native CLI for cross-platform iOS and Android apps
✅ Mobile app features: authentication, API integration, push notifications, dashboards, forms, and realtime updates
✅ Clean UI/UX implementation for SaaS dashboards, CRM/CMS portals, admin panels, and mobile applications
🔧 Backend & System Architecture:
✅ Node.js and Express.js REST API development with MVC/service-layer architecture
✅ Database architecture with Supabase/PostgreSQL, MongoDB/Mongoose, Prisma ORM, and Firebase/Firestore
✅ Multi-tenant SaaS backend structure with RBAC, secure authentication, and scalable data models
✅ Supabase Auth, RLS policies, SQL policies, Edge Functions, Realtime, Storage, and migrations
✅ API security: validation, rate limiting, secure sessions/tokens, permissions, and secrets hygiene
✅ Webhook architecture with signature verification, retries, idempotency, and background processing
✅ Deployment and infrastructure support using Docker, Vercel, AWS, Azure, Hostinger, and cPanel
✅ Structured logging, debugging, performance optimization, and production support
💳 Payment, Subscription & API Integration:
✅ Stripe and Stripe Connect for subscriptions, invoices, marketplace payments, billing portals, and webhooks
✅ Razorpay and PayPal payment gateway integration
✅ Secure webhook handling with signature verification, retries, and idempotency keys
✅ Twilio for SMS, OTP, and communication workflows
✅ CRM, ERP, Jira, Notion, and third-party SaaS API integrations
✅ REST APIs, GraphQL APIs, webhooks, automation flows, and legacy system integration
✅ Cloudflare, CDN, caching, and performance optimization
🤖 AI Automation & LLM Integration:
✅ AI chatbot development for websites, SaaS platforms, CRMs, CMS systems, and customer support
✅ OpenAI API, ChatGPT API, Claude, Gemini, and custom LLM API integration
✅ AI agents, RAG systems, and intelligent automation connected with business workflows
✅ LangChain-based AI workflows and custom AI tool development
✅ AI-powered forms, content generation, lead qualification
🔒 Security & Reliability:
✅ RBAC, OAuth 2.0, JWT authentication, SSO, and secure session handling
✅ OWASP-aligned development practices with input validation and access control
✅ Row-level security, database permission
🌍 Why Work With Me?
✔️ Strong experience across SaaS, AI tools, dashboards, CRM/CMS systems, APIs, and mobile apps
✔️ Ability to handle frontend, backend, database, AI integration, payments, deployment, and production support
✔️ Clean, maintainable, and scalable code structure
✔️ Clear communication, scoped milestones, regular update
📩 Ready to Build?
Let’s connect and take your idea to the next level—whether you need a robust backend, interactive frontend, React Native mobile app, or a full-blown Next.js + Supabase + Stripe SaaS.
Steps for completing your project
After purchasing the project, send requirements so Kashyap can start the project.
Delivery time starts when Kashyap receives requirements from you.
Kashyap works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering & Planning
Collect project features, endpoints, roles, and logic. Confirm API types: CRUD, authentication, file upload, etc. Define deliverables, timeline, and scope.
Database Schema Design (MongoDB)
Plan collections, fields, relationships. Design using Mongoose models. Validate structure and scalability for future features.