Why do qualified candidates get rejected before a recruiter even sees their resume?

I've spent years in recruitment, and one thing still surprises me:

Good candidates get rejected every day before a human ever sees their resume.

Not because they're unqualified.

Not because they lack experience.

But because their resume isn't optimized for how modern hiring systems work.

We've reviewed thousands of resumes across the UAE, India, and global markets, and the same patterns keep appearing:

• Strong candidates using outdated formats
• Critical keywords missing
• ATS parsing errors
• Resumes written for humans but not screening systems

I'm curious:

Have you ever applied for dozens of jobs and received little to no response?

What do you think was the biggest reason?

I'd love to hear your experience.