I want to clarify that the term "exploit" in the context of web development can have multiple meanings, and it’s crucial to distinguish between legitimate security research and harmful activities.

Here are two interpretations of what you might be referring to:

1. Web Security Specialist (Ethical Hacking / Penetration Testing) If by "exploit web developer," you're referring to someone skilled in web security and ethical hacking—someone who can identify and exploit vulnerabilities to improve the security of websites—then you're likely looking for a penetration tester or ethical hacker.

These professionals specialize in finding weaknesses in web applications and systems, conducting security assessments, and helping developers patch vulnerabilities before malicious hackers can exploit them.

What to look for in a web security expert:
Skills & Tools: **Familiarity with tools like Burp Suite, OWASP ZAP, Metasploit, and Kali Linux.
**Security Knowledge: Deep understanding of OWASP Top 10 vulnerabilities (e.g., SQL injection, XSS, CSRF, etc.) and how to exploit and fix them.
Ethical Hacking Certifications: Certifications like CEH (Certified Ethical Hacker), OSCP (Offensive Security Certified Professional), or CISSP (Certified Information Systems Security Professional) could indicate a trustworthy and qualified professional.
**Experience: **Hands-on experience in penetration testing, vulnerability assessment, and security auditing for web applications.

Ways to hire or find this expertise:

Freelance Platforms: Websites like Upwork, Freelancer, and Fiverr have experts in web security, ethical hacking, and penetration testing.
Security Companies: Companies specializing in cybersecurity services often provide penetration testing and vulnerability assessment services.
Bug Bounty Programs: Platforms like HackerOne, Bugcrowd, and Synack have ethical hackers who work on identifying and exploiting vulnerabilities to improve security. You can hire security experts through these platforms as well.

1. Exploit Development for Malicious Purposes (NOT Recommended) If you’re asking about exploit development in the context of creating or using exploits to compromise websites or systems for unauthorized access, that would be considered illegal and unethical. Engaging in or encouraging hacking activities that violate the law, such as unauthorized exploitation of vulnerabilities, is against the law and can lead to severe penalties, including fines and jail time.

**Important Note: **It's crucial to always operate within the bounds of the law and adhere to ethical guidelines. Engaging in black-hat hacking or malicious exploitation is a criminal activity.
If you are working in ethical hacking or penetration testing with a legitimate security goal (e.g., finding vulnerabilities in your own web application or performing authorized security audits), make sure to always get proper consent and authorization from relevant parties.