Contact person: Resolve Android CertPathValidatorException Issue / Cloudfare Experience Essential

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Location: Camelon, United Kingdom

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need help tracking down and fixing a CertPathValidatorException that suddenly started blocking traffic from Android 16 devices inside our native Android app. The same endpoint is protected by Cloudflare and continues to load perfectly in browsers and on other Android versions, so I suspect something in the certificate chain or TLS handshake is tripping up that specific SDK level rather than a general server fault.

Nothing changed on our side—no code pushes, no Cloudflare rule edits—yet the app now throws the exception as soon as it fetches data. The error is limited to the mobile app; the public site itself remains unaffected.

I’m looking for someone who can:
• reproduce the failure on an Android 16 emulator or device
• inspect the certificate chain (Cloudflare edge, origin cert, intermediates) with tools such as OpenSSL, Qualys SSL Labs, or Android’s Network Security Config validator
• advise on or implement the remediation—whether that’s replacing a missing intermediate cert, updating the app’s network-security-config, or adjusting Cloudflare’s SSL/TLS options
• verify the fix by demonstrating successful calls from the affected Android version while keeping existing devices working

Please let me know your approach and how quickly you can begin." (client-provided description)