The latest articles on DEV Community by Doğukan DEMİR (@doukan_demir_e475427969a). https://dev.to/doukan_demir_e475427969a https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F2219162%2Fa55369a6-155b-45e0-bc57-7a9060525089.jpg https://dev.to/doukan_demir_e475427969a en Doğukan DEMİR Sun, 31 May 2026 11:08:15 +0000 https://dev.to/doukan_demir_e475427969a/how-i-built-an-ai-interview-prep-tool-with-nextjs-claude-api-and-what-i-learned-854 https://dev.to/doukan_demir_e475427969a/how-i-built-an-ai-interview-prep-tool-with-nextjs-claude-api-and-what-i-learned-854 <p>I've been job hunting for a while. Every interview meant <br> 2-3 hours of manual prep — researching the company, <br> guessing questions, writing out answers.</p> <p>So I built Hiddea.</p> <h2> How it works </h2> <ol> <li>User pastes a job listing URL</li> <li>We scrape the listing + company page with Cheerio</li> <li>Claude API analyzes everything and generates: <ul> <li>Role-specific behavioral questions with STAR frameworks</li> <li>Technical questions based on the actual stack in the listing</li> <li>Company culture insights</li> <li>Personalized study plan</li> </ul> </li> </ol> <h2> Tech stack </h2> <ul> <li>Next.js 14 (App Router) — web + API routes</li> <li>React Native (Expo) — mobile</li> <li>PostgreSQL + Redis — database &amp; caching</li> <li>Claude API (Sonnet) — AI engine</li> <li>Drizzle ORM — type-safe queries</li> </ul> <h2> The interesting part — prompt engineering </h2> <p>The hardest part wasn't the scraping or the UI. <br> It was getting Claude to generate questions that are <br> actually specific to the listing, not generic templates.</p> <p>Key insight: you have to explicitly tell the model to <br> cross-reference the tech stack, seniority level, and <br> company size — otherwise it defaults to generic output.</p> <h2> What I learned </h2> <ul> <li>"Anyone can do this with ChatGPT" is the most common objection → True, but most people don't. The value is the setup, not the AI.</li> <li>Scraping job listings is messier than expected → LinkedIn blocks, Indeed has paywalls, Greenhouse is clean</li> <li>Prompt caching saves ~40% on Claude API costs</li> </ul> <h2> What's next </h2> <ul> <li>CV upload + matching against job requirements</li> <li>Mock interview mode</li> <li>Multi-language support (already have 4 languages)</li> </ul> <p>Try it at hiddea.com — free, no credit card needed.<br> Happy to answer questions about the implementation 👇</p> ai career nextjs showdev