Nihat Karahan — Software Engineer

Full-Stack Developer · Wyckoff, NJ

CS student at William Paterson University
5+ years shipping production apps — web, cloud & browser extensions.

Live Products

Years Coding

JavaScript TypeScript Node.js React Next.js Firebase Supabase Stripe API C++ / Python Azure · AWS PostgreSQL Chrome Extensions OpenAI API Clerk Auth Vercel

Selected Work

Chrome Extension

Walculator

Profit & WFS fee calculator for Walmart Marketplace sellers — published on the Chrome Web Store with premium subscription billing.

JavaScript Firebase Auth Stripe Chrome API Webpack REST API

Real-time profit & fee calculations for sellers

Firebase Authentication + Stripe subscription billing

Dedicated marketing site at walculatorext.com

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Web App · AI

ExamTutorAI

Upload any PDF and instantly generate flashcards, quizzes & study guides. Built for students who need to study fast and efficiently.

Next.js OpenAI API Supabase Stripe Clerk Auth Vercel

AI-powered flashcard & quiz generation from PDFs

Clerk authentication + Supabase storage backend

Stripe subscription tiers for premium access

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Extension · AI

ConfidenceCheck

AI-powered browser extension that fact-checks claims in real time as you browse — with email authentication and unlimited usage.

Chrome API Next.js Supabase OpenAI API Vercel Email Auth

Real-time AI fact-checking on any webpage

Supabase email auth — no payment barrier

Next.js backend deployed on Vercel

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Security · Web App

Vulnerability

Security scanning platform that detects vulnerabilities across web apps and codebases — delivering actionable threat reports instantly.

Next.js Clerk Auth Neon PostgreSQL Vercel OpenAI API REST API

Automated vulnerability detection & risk scoring

Clerk authentication with Neon PostgreSQL backend

AI-generated remediation suggestions per finding

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Agency · Freelance

Karahan Design

Full-service web design & development agency delivering professional websites for dental, restaurant, legal, and beauty industries.

Next.js React Tailwind CSS Vercel Framer Motion TypeScript

Custom sites for dental, restaurant & legal clients

SEO-optimized, mobile-first responsive designs

End-to-end delivery from design to deployment

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Full-Stack

End-to-end shipping from database schema to pixel-perfect UI

🔐

Auth & Payments

Clerk, Firebase Auth, Stripe — production-grade billing flows

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AI Integration

OpenAI API — from prompt engineering to deployed products

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Extensions

Published Chrome extensions with monetization & auth

☁️

Cloud & DevOps

Vercel, Azure, AWS — CI/CD pipelines and edge deployments