You will get an AI-powered full-stack SaaS app with LangChain, Next.js, and FastAPI
Project details
I build production-ready AI-powered SaaS applications using Next.js,
FastAPI, and LangChain — delivering clean architecture, real-time APIs,
and intelligent automation that scales.
Services include:
→ LLM integration (GPT-4, Claude, RAG pipelines, multi-agent systems)
→ Full-stack development (Next.js 15, NestJS, FastAPI, WebSockets)
→ SaaS architecture (multi-tenancy, Supabase RLS, JWT auth, RBAC)
→ AI agents & automation (voice agents, WhatsApp bots, Whisper STT)
→ CI/CD & deployment (Docker, GitHub Actions, Vercel, AWS)
Past work includes a solo-built multi-tenant pharmacy ERP with voice
prescription entry via Whisper + GPT-4 (shipped in 40 days), a
real-time messaging platform with a native Tauri desktop app, and a
live WhatsApp AI ordering agent powering a restaurant client.
I communicate clearly, flag issues early, and deliver code that's
ready for real users — not just demos. Message me with your idea and
I'll tell you exactly what's possible.
FastAPI, and LangChain — delivering clean architecture, real-time APIs,
and intelligent automation that scales.
Services include:
→ LLM integration (GPT-4, Claude, RAG pipelines, multi-agent systems)
→ Full-stack development (Next.js 15, NestJS, FastAPI, WebSockets)
→ SaaS architecture (multi-tenancy, Supabase RLS, JWT auth, RBAC)
→ AI agents & automation (voice agents, WhatsApp bots, Whisper STT)
→ CI/CD & deployment (Docker, GitHub Actions, Vercel, AWS)
Past work includes a solo-built multi-tenant pharmacy ERP with voice
prescription entry via Whisper + GPT-4 (shipped in 40 days), a
real-time messaging platform with a native Tauri desktop app, and a
live WhatsApp AI ordering agent powering a restaurant client.
I communicate clearly, flag issues early, and deliver code that's
ready for real users — not just demos. Message me with your idea and
I'll tell you exactly what's possible.
Programming Languages
JavaScript, Python, TypeScriptWhat's included
| Service Tiers |
Starter
$199
|
Standard
$1,099
|
Advanced
$2,499
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 21 days |
Number of Revisions | 2 | 3 | Unlimited |
Number of Pages | 1 | 3 | 5 |
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$30
Design Customization
(+ 2 Days)
+$150
Content Upload
(+ 1 Day)
+$80
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EC
Echo C.
Feb 20, 2025
Tutoring Software Engineering Trail Lesson
About Humayun
Full-Stack AI Engineer Next.js FastAPI LangChain Multi-Agent Systems
Rawalpindi, Pakistan - 3:45 am local time
With 2+ years of hands-on experience across the full stack, I specialise in shipping complex products solo: multi-tenant backends, LLM-orchestrated pipelines, real-time APIs, and intelligent automation agents. I've worked with remote teams across Pakistan, Canada, Saudi Arabia, and Qatar — and I treat every client engagement like a co-founder partnership.
What I bring to your project:
→ GenAI & LLM Integration — LangChain, LangGraph, OpenAI GPT-4, Whisper, RAG pipelines, multi-agent orchestration, structured output parsing
→ Full-Stack Development — Next.js 15, NestJS, FastAPI, Hono, WebSockets, REST APIs, JWT auth, Prisma ORM
→ SaaS Architecture — Multi-tenancy, Row-Level Security (Supabase), CI/CD via GitHub Actions, Docker, Turborepo
→ AI Agents & Automation — Voice agents (LiveKit, Whisper), WhatsApp bots, conversational AI, real-time event pipelines
Flagship project: I single-handedly built Ruhab — a production multi-tenant pharmacy ERP with 50+ secured REST APIs, RBAC, refresh-token rotation, and a Whisper + GPT-4 voice prescription entry system — in under 40 days.
I don't just write code. I ask the right questions, flag edge cases early, and deliver work that's ready for real users — not just a demo.
If you need a reliable senior-level AI engineer who ships on time and communicates clearly, let's talk.
Steps for completing your project
After purchasing the project, send requirements so Humayun can start the project.
Delivery time starts when Humayun receives requirements from you.
Humayun works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements Review
Analyze client brief, clarify scope, confirm tech stack and deliverables.
Step 2 — Architecture & Planning
Define system design, database schema, API structure, and AI pipeline flow.