Show HN: AI-powered cover letter generator based on resume and job description (payrankjobs.ai)

Hi HN! I built PayRankJobs(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 and you'll get job matches with cover letter options.

Would love feedback on the AI prompting approach or the overall UX!