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Arbab Mustafa

@arbabmustafa

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Full Stack Developer | MERN • Python • FastAPI • Docker • Azure | RAG Pipelines • LangChain | 25 + Apps Shipped

Germany

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What I'm looking for

I want to build and scale multi-tenant SaaS products with strong AI integrations, end-to-end ownership, and fast, reliable delivery—partnering with stakeholders to ship features that improve performance, uptime, and monetization.

I build production SaaS products end-to-end, with a focus on reliability, speed of delivery, and clean multi-tenant architecture. I ship features from brief to deployment and work directly with stakeholders to turn requirements into working systems.

Most recently, I built AI-powered SaaS and multi-tenant backend systems for international clients, shipping 24+ production SaaS applications. I combine Next.js (TypeScript) frontends with FastAPI/Python backends, designed multi-tenant data isolation, and ensured role-based access control to prevent cross-tenant leakage.

I integrate LLM capabilities into real products—connecting OpenAI GPT-4o and Anthropic Claude via LangChain, including a RAG legal assistant that cut document search time from hours to <3 seconds. I also implement practical monetization with Stripe and PayPal, including usage flows and webhook handling across multiple products.

On the engineering side, I automate releases with Docker and Azure CI/CD pipelines, reducing release time from 2 hours to 8 minutes while maintaining 99%+ uptime. I’m hands-on across backend, frontend, and DevOps, and I enjoy building systems that scale without sacrificing correctness.

Experience

Work history, roles, and key accomplishments

Full Stack Engineer

Hoods Hub

Nov 2024 - Jan 2026 (1 year 2 months)

Built AI-powered multi-tenant SaaS products end-to-end, shipping 24+ production apps from brief to deployment. Integrated GPT-4o and Claude via LangChain (RAG legal assistant cut search to <3 seconds) and implemented Stripe/PayPal subscription billing with RBAC-isolated PostgreSQL/MongoDB.

Next.js TypeScript fastAPI Lang Chain GPT 4o Anthropic: Claude Multi Tenant Data Isolation & RBAC Stripe Billing

MERN Stack Developer

TechNetCloud

Aug 2023 - Sep 2024 (1 year 1 month)

Developed backend and database architecture for production business applications, improving query performance by ~35% through PostgreSQL/MongoDB schema design and query optimization. Built secure REST APIs with JWT authentication and role-based access control.

PostgreSQL MongoDB Database Schema Design Query Optimization REST API Development JWT RBAC Backend Development

Frontend Developer

EscapeWire Solutions

Feb 2022 - May 2023 (1 year 3 months)

Built React/Next.js interfaces for a US startup, delivering 6 responsive UIs and integrating 8 REST APIs. Improved page load time by 30% through performance-focused frontend development.

React Next.js TypeScript REST APIs Responsive UI Performance Optimization Frontend Development