You will get a professional backend developer in Node.js, SQL, MongoDB for your website
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Are you looking for an experienced backend web developer to build, optimize, or scale your application? I specialize in Node.js, Express.js, MongoDB, SQL, and Firebase, delivering secure, high-performing, and scalable server-side solutions tailored to your needs.
Here’s what I can do for you:
• Backend API Development – Build RESTful APIs and microservices with Node.js & Express.js.
• Database Design & Management – Create, optimize, and manage databases in MongoDB, MySQL, and PostgreSQL.
• Authentication & Security – Implement JWT authentication, role-based access control, and data encryption.
• Third-Party Integrations – Seamlessly integrate Stripe, PayPal, Slack, Jira, Salesforce, and SAP.
• Bug Fixing & Optimization – Debug, refactor, and enhance existing backend systems for better performance & scalability.
• CI/CD Setup & Version Control – Automate deployment pipelines using Git, Docker, and cloud services.
• API Documentation – Provide clean, well-structured, and developer-friendly documentation.
• Custom Features & Enhancements – Add new functionality or update existing ones to latest standards.
Let’s work together to transform your idea into a robust backend solution.
Here’s what I can do for you:
• Backend API Development – Build RESTful APIs and microservices with Node.js & Express.js.
• Database Design & Management – Create, optimize, and manage databases in MongoDB, MySQL, and PostgreSQL.
• Authentication & Security – Implement JWT authentication, role-based access control, and data encryption.
• Third-Party Integrations – Seamlessly integrate Stripe, PayPal, Slack, Jira, Salesforce, and SAP.
• Bug Fixing & Optimization – Debug, refactor, and enhance existing backend systems for better performance & scalability.
• CI/CD Setup & Version Control – Automate deployment pipelines using Git, Docker, and cloud services.
• API Documentation – Provide clean, well-structured, and developer-friendly documentation.
• Custom Features & Enhancements – Add new functionality or update existing ones to latest standards.
Let’s work together to transform your idea into a robust backend solution.
Programming Languages
HTML & CSS, JavaScript, PythonCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$150
|
Standard
$1,000
|
Advanced
$5,000
|
|---|---|---|---|
| Delivery Time | 3 days | 14 days | 40 days |
Number of Revisions | Unlimited | Unlimited | Unlimited |
Number of Pages | 1 | 3 | 10 |
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code |
Frequently asked questions
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FA
Farouq A.
Nov 4, 2025
60 minute consultation
BD
Bryan D.
Aug 23, 2025
Pay for Existing Work
AA
Ali A.
May 22, 2025
Tiktok app 2
Great work and professional throughout the project.
CH
Colby H.
Aug 23, 2024
Continuing Updates Between Version 2 and 3
CR
Carter R.
Mar 28, 2024
Build frontend UI for eLearning platform from Figma wireframe using existing GCP Cloud Functions
About Hassan
Senior AI Engineer + Full-Stack | SaaS, React.js, MVPs, Chatbots
100%
Job Success
Lahore, Pakistan - 5:55 pm local time
I build production-grade SaaS web apps, mobile apps, AI chatbots, and AI agents — end to end. Senior engineer with 8+ years of experience; I've shipped products solo and led small teams when the project needed it.
Most projects are a mix — AI integration, chatbot work, and full-stack web/mobile builds, often all at once.
WHAT I BUILD
▸ AI-powered SaaS platforms Multi-tenant SaaS in Next.js + Postgres/Supabase + Stripe. Auth, billing, dashboards, admin panels. MVP in 2–6 weeks; ongoing for production. Full-stack development, end to end.
▸ Mobile apps with AI React Native + Expo cross-platform. Native iOS/Android when needed. Push, offline sync, deeplinks, subscriptions. AI features integrated cleanly (chat, voice, RAG, OCR).
▸ AI chatbots & RAG systems Custom chatbot development with Claude (Anthropic) or GPT, trained on your docs, PDFs, CRM. Vector search (Pinecone or Supabase pgvector). Citation-backed answers. Delivered on web, WhatsApp, or Slack.
▸ AI agents & automation Multi-step AI agents with LangChain / LangGraph + MCP tool servers. Document processing, lead qualification, research, internal-ops automation. Hooked into Make, n8n, Zapier — automation expert across the major no-code platforms.
▸ AI integration into existing apps Drop Claude, GPT, or Gemini into the app you already have. Connect AI to your existing CRM, dashboards, and tools. The most common project type — fast retrofit, clear ROI.
▸ Voice & calling agents Vapi, Retell, Bland, ElevenLabs, Deepgram, Twilio, LiveKit. Sub-200ms inbound/outbound, CRM dispositioning, appointment booking. Built when the project calls for it.
▸ Chrome extensions & internal tools Manifest V3 extensions, scraping/automation tools, admin dashboards.
▸ Vibe-code cleanup & deployment Lovable, Bolt, Replit, Cursor projects that need real engineering: production refactor, security, deploy pipeline, debugging, scaling.
DEFAULT STACK
Frontend: Next.js, React, React Native, TypeScript, Tailwind Backend: Node.js, Python (FastAPI), Postgres, Supabase, MongoDB, Redis AI: Claude (Sonnet/Opus), GPT-4o/5, Gemini, LangChain, LangGraph, MCP servers, Pinecone, Supabase pgvector Voice: Vapi, Retell, Bland AI, ElevenLabs, Deepgram, Twilio, LiveKit Mobile: React Native, Expo, native iOS/Android Infra: AWS, Vercel, Cloudflare, Docker, GitHub Actions Integrations: Stripe, Twilio, SendGrid, WhatsApp Business API, GoHighLevel, HubSpot, Salesforce
RECENT REAL DEPLOYMENTS (anonymized for NDA)
• Multi-agent recruitment platform — 5 specialized agents, LangGraph orchestrator, Stripe billing. • Healthcare RAG — medical report drafter, citation-backed answers, cut documentation time 90%. • Real-estate voice agent — Vapi + GHL + Twilio. 100+ inbound calls/week, 30+ tours auto-booked. • Warehouse inventory chatbot — millions of rows via RAG, 90% faster analytics for 3PL clients. • Fitness SaaS — multi-tenant React Native + Node + Stripe + AI coaching agent. • Document automation OCR — handwritten manufacturing reports → structured Excel.
HOW I WORK
Spec first. Loom walkthrough before I write code so we agree on scope.
Production-grade output: auth, error handling, deploy pipeline, README, handover.
0–4 hour response time, typically start within 24–48 hours of contract signing.
I write the code myself.
If you want a 15-min demo of working systems before you commit, send a brief and I'll send a Loom of similar past work.
Steps for completing your project
After purchasing the project, send requirements so Hassan can start the project.
Delivery time starts when Hassan receives requirements from you.
Hassan works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Gathering
Collect client’s needs, preferred stack, and integration details.
Architecture Planning
Define database schema, API routes, and backend workflow.