What qualifications are required and recommended for web application penetration testing?

Recommended qualifications of the penetration testers performing the web application penetration testing should be OSCP qualified and CREST certified.

A solid understanding of your infrastructure's elements + ability to detect fast changes: a web application has a frontend and a backend + containers hosted on servers behind router firewall so pentester is someone who will look at data transits through stacks and systems with a great imagination how to took control over it

A solid understanding of web technologies and basic networking concepts is essential, along with familiarity with penetration testing tools like Burp Suite and Wireshark. However, based on my experience, the most critical skills are the ability to analyze complex systems and strong communication skills. I have seen that some consultants consider themselves experts solely based on their knowledge of tools, but this approach often falls short in real-world environments. True expertise requires a deeper understanding of the systems being tested and the ability to effectively communicate with stakeholders (e.g. during scoping, report readout calls etc).