03 / Fullstack
Haziq
AI Chat Assistant
01 / Overview
Haziq is a modern AI-powered chat application that combines intelligent conversations, document analysis, and file processing in a clean, production-ready Next.js 15 interface.
02 / The Challenge
Problem
The goal was to build a real, shippable AI product—not just a playground. It needed secure authentication, subscription management, and reliable file handling on top of streaming AI conversations that feel fast and natural.
03 / The Approach
Solution
I designed and implemented a full-stack Next.js 15 app using the Vercel AI SDK for streaming GPT-4o responses, Prisma and PostgreSQL for data persistence, Auth.js for secure multi-provider auth, and Stripe for subscription billing. The result is a focused assistant that handles chat, document uploads, and account management within a single cohesive product.
04 / Features
What I Built
AI Chat Experience
Streaming GPT-4o chat with typing indicators, conversation history, and context-aware follow-ups in a clean, distraction-free UI.
File & Document Handling
Support for multi-format file uploads (documents, images, spreadsheets) with server-side processing and AI-powered analysis.
Authentication & Accounts
Auth.js-based authentication with email, Google, and GitHub sign-in, secure sessions, and profile management screens.
Subscriptions & Billing
Stripe-powered subscriptions with clear pricing tiers, upgrade flows, and usage-aware guardrails around heavy operations.
05 / Screens
Product Shots
06 / Outcomes
Results
1 week
From blank repo to deployed AI product with auth, billing, and file handling.
Single codebase
Chat UI, API routes, background processing, and billing all live inside one Next.js app.
Production-ready
Designed and implemented with deployment, reliability, and future iteration in mind—not just as a demo.