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Full-Stack SaaSFeatured Project
Koolaai (LLM Chat App)
Full-Stack SaaS Platform powered by ChatGPT, Gemini & AI Image Gen
3+
Supported AI Models
bKash / Nagad
Payment Gateway
Full-Stack SaaS
Architecture
PROJECT CASE STUDY & OVERVIEW
Koolaai is an all-in-one AI productivity platform that brings together OpenAI ChatGPT, Google Gemini, and custom image synthesis models under a unified subscription platform. Features dynamic chat sessions, e-commerce image generation workflows, and localized Mobile Financial Services (bKash, Nagad, Rocket) integration.
Technical Challenges & Architectural Solutions
Engineered an asynchronous API queue system to handle concurrent LLM requests and image rendering without blocking the server main loop.
CORE FUNCTIONALITIES & FEATURES
Multi-model LLM chat switcher (ChatGPT & Gemini integration)
Custom e-commerce product image background generator
Automated subscription tier management and token tracking
Secure payment processing with local Bangladeshi MFS APIs
Responsive dark UI with instant SSE (Server-Sent Events) streaming responses
TECHNOLOGY STACK BREAKDOWN
Frontend
Next.js App RouterTypeScriptTailwind CSSFramer Motion
Backend & APIs
Node.jsExpressOpenAI APIGoogle Gemini APIbKash API
State & Database
MongoDBRedux ToolkitTanStack Query