Show HN: AI-powered cover letter generator based on resume and job description

Hi HN! I built PayRankJobs(https://payrankjobs.ai https://payrankjobs.ai), an AI job matching service, and one of the most popular features has been the automated cover letter generation. Here's how it works: • Upload your PDF resume once • AI extracts your skills, experience, and background • Click "Create Cover Letter" on any job match in your email • An LLM analyzes both your profile AND the specific job description. • Generates a personalized cover letter tailored to that exact role • Emails it to you What makes it different from generic cover letter tools: - Uses your actual resume data (not templates) - Analyzes the specific job posting requirements - Matches your background to role needs - Avoids generic "I'm perfect for this" language The system has generated 500+ cover letters so far. Tech stack: Cloudflare Workers, OpenAI o3, PostgreSQL with pgvector, queue-based architecture for reliability. Try it: Upload a resume at https://payrankjobs.ai https://payrankjobs.ai and you'll get job matches with cover letter options. Would love feedback on the AI prompting approach or the overall UX!