ActiveFence

Application Security Researcher

ActiveFence  •  London, GB (Onsite)  •  8 days ago
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Job Description

We are seeking a highly motivated and technically proficient Senior Penetration Tester to join our security research division. This role is dedicated to performing advanced offensive security assessments against the biggest companies in the world

You need to be independent, attentive to details, organized, eager to learn new things, and like to research and solve problems

What you’ll do:

  • Lead and execute comprehensive, technically rigorous penetration tests targeting complex web applications, modern API architectures, and enterprise systems for organizations with significant global presence.
  • Engage in sophisticated Red Team projects, including the identification of undisclosed API endpoints, development of novel bypass techniques for established security controls, and lateral movement within target environments.
  • Contribute substantively to the design, development, and maintenance of proprietary internal security tools and automation frameworks to enhance the efficacy and efficiency of offensive operations.

Requirements

Requirements:

  • Minimum of 3 years of proven, hands-on experience in application security analysis, with a heavy emphasis on complex API penetration testing and a mastery of the OWASP Top 10 landscape.
  • Proficiency in developing and automating tasks using at least one language like Python, JavaScript, or GoLang.
  • Strong experience with static and dynamic analysis of Android and iOS applications, including hands-on experience with techniques like detours, hooking, and runtime code manipulation
  • Deep, hands-on knowledge of the latest tactics, techniques, and procedures (TTPs) used in advanced penetration testing and network analysis.
  • Ability to author comprehensive and technically rigorous reports detailing identified vulnerabilities and research outcomes.

Nice to have:

  • OSCP, OSWE, eWPTXv2, CRTP, or other high-level offensive certifications.
  • Hands-on experience with industry-standard reversing tools like JADX, Ghidra, or IDA Pro.
  • Demonstrated online achievements, write-ups, or contributions on platforms such as HackTheBox, Pwn2Own, TryHackMe, Bug Bounty programs, or published security research.

About Alice

Alice is a trust, safety, and security company built for the AI era. We safeguard the communicative technologies people use to create, collaborate, and interact—whether with each other or with machines.

In a world where AI has fundamentally changed the nature of risk, Alice provides end-to-end coverage across the entire AI lifecycle. We support frontier model labs, enterprises, and UGC platforms with a comprehensive suite of solutions: from model hardening evaluations and pre-deployment red-teaming to runtime guardrails and ongoing drift detection.

ActiveFence

About ActiveFence

ActiveFence is the leading provider of AI security and safety solutions, protecting online experiences and AI applications for over 3 billion users, top foundation models, and the world’s largest enterprises and tech platforms.

As a trusted partner to major technology companies and Fortune 500 brands, we secure user-generated and GenAI products against prompt injection, adversarial attacks, and harmful content through Real-Time Guardrails, continuous Red Teaming, and the industry’s most advanced threat intelligence.

With unmatched detection capabilities in 117+ languages, ActiveFence empowers organizations to deliver engaging, safe, and trustworthy experiences globally, helping them innovate responsibly while staying ahead of emerging threats.

Industry
IT & Software
Company Size
201-500 employees
Headquarters
New York
Year Founded
2018
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