You will get Build Scalable APIs, Web Apps & Backend with Node.js (Express/MongoDB)
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Top Rated
Project details
Need a secure, scalable, and fast backend for your web or mobile app?
I will build a custom Node.js backend using Express.js, MongoDB, and modern best practices—perfect for MVPs, admin panels, SaaS apps, or API-based systems.
Depending on your package (Starter, Standard, Advanced), your backend can include:
✅ RESTful API development
✅ JWT authentication & role-based access
✅ MongoDB database integration
✅ File uploads & cloud storage
✅ Error handling & validation
✅ API documentation (Swagger or Postman)
✅ Hosting (Heroku, Vercel, or your choice)
Whether you need a simple CRUD API or a complete production-grade backend, I’ll ensure your project is delivered clean, optimized, and well-documented.
Let’s build something solid—on time, and with clean code.
I will build a custom Node.js backend using Express.js, MongoDB, and modern best practices—perfect for MVPs, admin panels, SaaS apps, or API-based systems.
Depending on your package (Starter, Standard, Advanced), your backend can include:
✅ RESTful API development
✅ JWT authentication & role-based access
✅ MongoDB database integration
✅ File uploads & cloud storage
✅ Error handling & validation
✅ API documentation (Swagger or Postman)
✅ Hosting (Heroku, Vercel, or your choice)
Whether you need a simple CRUD API or a complete production-grade backend, I’ll ensure your project is delivered clean, optimized, and well-documented.
Let’s build something solid—on time, and with clean code.
Database Type
MS SQL, PostgreSQL, MongoDB, Azure Cosmos DBWhat's included
| Service Tiers |
Starter
$60
|
Standard
$120
|
Advanced
$250
|
|---|---|---|---|
| Delivery Time | 3 days | 5 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Tables Added | 2 | 5 | 10 |
Schema Diagram | |||
Permissions Setup | |||
Import/Export Data | |||
Admin Panel Setup |
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RC
Ryan C.
Nov 27, 2025
Developer Needed to Build Custom Invoicing & Billing App
Working with him was a smooth and hassle-free experience. He understood the requirements clearly, delivered quality work on time, and communicated professionally throughout the project. If you’re looking for someone reliable and skilled, he’s definitely a great choice.
RC
Ryan C.
Nov 4, 2025
Developer Needed to Build Custom Invoicing & Billing App
Working with Kuldeep was a really good experience. He understood what I needed, kept in touch regularly, and completed the work on time. The quality was great, and everything went smoothly. I really appreciate his effort and would be happy to work with him again in the future.
PN
Prijwal N.
Sep 29, 2025
Port NodeJS Code and Integrate Apryse Drawing Tools
SY
Shivam Kumar Y.
Sep 6, 2025
Spike Alert System to Existing Social Media Analytics Tool
My experience working with Kuldeep was excellent. He is highly professional, communicates clearly, and delivers quality work on time. I really appreciate his dedication and problem-solving approach. I would definitely love to work with Kuldeep again on future projects!
VA
Venkata A.
Aug 23, 2025
Python Developer for Summarization Application
About Kuldeep
AI & Automation Engineer | Multi-Tenant SaaS, RAG, Python & Node.js
100%
Job Success
Khategaon, India - 5:18 pm local time
I build AI automation and multi-tenant SaaS backends in Python and Node.js.
Recent work: A WhatsApp assistant answering tenant questions from a RAG knowledge base in ChromaDB, a Playwright system that monitors government development applications overnight and emails stakeholders before anyone opens a laptop, and a property platform that publishes its own listings to Facebook Marketplace.
WHAT I DO
AI and LLM integration
Claude API and OpenAI API integration, RAG pipelines with ChromaDB and vector search, LangChain, WhatsApp Business API assistants, n8n workflow automation.
Python automation and data acquisition
Playwright and Python scrapers running concurrently at scale, FastAPI services, scheduled AWS Lambda and EventBridge jobs, automated reporting and alerting through SendGrid.
Multi-tenant SaaS architecture
PostgreSQL tenant isolation, role-based access control across multiple user types, Stripe subscription billing, Azure AD and MSAL enterprise authentication.
Backend engineering and rescue work
Slow queries, broken integrations, architecture that stopped scaling. Python, FastAPI, Flask, Node.js, Java Spring Boot.
PROJECTS
Propfinda - Multi-tenant property management SaaS. PostgreSQL data isolation, RBAC for admins, owners and tenants, Stripe billing. Automated listing distribution to Facebook Marketplace via Meta API and n8n. WhatsApp onboarding assistant powered by a ChromaDB RAG knowledge base. Playwright pipelines pulling rental applications from external channels.
DA Scraper - Automated monitoring platform tracking infrastructure development applications across government networks. Concurrent Playwright and Python scrapers, FastAPI, PostgreSQL audit history, serverless alerting via AWS Lambda, EventBridge and SendGrid.
Projx-Matrix - Real estate feasibility and lot-pricing platform. Azure AD (MSAL) enterprise SSO, Flask microservices containerised on AWS ECS Fargate, DynamoDB, Next.js and Plotly analytics dashboards.
Cyberstash - Backend core for an Australian cyber defence platform. High-availability Java and Spring Boot APIs processing live threat detection arrays and infrastructure safety logs.
STACK
AI and automation: Claude API, OpenAI API, RAG, ChromaDB, LangChain, n8n, Playwright, WhatsApp Business API
Python: FastAPI, Flask, SQLAlchemy, Shapely, Pandas
JavaScript: Node.js, Express, NestJS, React, Next.js, TypeScript
Java: Spring Boot
Data: PostgreSQL, MongoDB, DynamoDB, ChromaDB, Supabase, Firebase
Cloud: AWS Lambda, ECS Fargate, EventBridge, S3, CloudFront, Docker, GitHub Actions, Azure AD
HOW I WORK
I reply within 0-4 hours and work 30+ hours a week. If I think your approach will cause problems later, I tell you before we start rather than after. If a project is not a fit for me, I say so instead of taking the contract.
Message me with what you are building and where you are stuck. I will
tell you how I would approach it before you spend anything.
Steps for completing your project
After purchasing the project, send requirements so Kuldeep can start the project.
Delivery time starts when Kuldeep receives requirements from you.
Kuldeep works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering & Discussion
Understand your project goals, features, and preferred tech stack.
API Design & Database Schema
Plan API routes and define MongoDB collections or schemas.