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F5 Sr Security Researcher 
United Kingdom, England, Chelmsford 
830961899

09.07.2025

Responsibilities:

  • Researching web frameworks and servers to identify and understand emerging threats.
  • Examining and replicating newly disclosed web application vulnerabilities.
  • Focusing on WAF (Web Application Firewall) evasion techniques to preemptively bypass our defenses before hackers can.
  • Creating innovative proof of concept solutions for advanced threats and continuously refining attack signatures, all in collaboration with development teams to enhance the WAF product using our research findings.
  • Gathering web security intelligence from blogs, forums, conferences, and academic papers.
  • Building tools and infrastructure for analyzing attacks.
  • Composing and distributing insights through blogs, reports, and presenting at security conventions.
  • Periodically performing security efficacy assessments on a variety of products, including WAFs, API security solutions, application security scanners, and machine learning models, to verify and improve their defense capabilities.

Qualifications:

  • At least 2 year of experience in analyzing real web attacks or web exploitation, with a strong preference for more extensive experience.
  • Deep knowledge of networking fundamentals, the HTTP protocol, web servers, and the inner workings of web applications is essential.
  • Experience in tracking emerging web vulnerabilities in real-time.
  • Experience in building research infrastructure and Python-based tools.
  • Experience with creating and comprehending Regular Expressions for detailed pattern matching and security-related data analysis.
  • In-depth knowledge of security principles, theories, and recognized attack vectors.
  • Experience in creating attack signatures, such as with tools like SNORT. - Advantage.
  • Analyzing binary malware and malicious scripts. - Advantage.
  • Knowledge in web development (front and back end). - Advantage.

The Job Description is intended to be a general representation of the responsibilities and requirements of the job. However, the description may not be all-inclusive, and responsibilities and requirements are subject to change.

The annual base pay for this position is: $128,000.00 - $192,000.00