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Application Security Engineer

Job in Lewes, Lewes District, East Sussex, BN7 3FD, England, UK
Listing for: Bugcrowd
Full Time position
Listed on 2025-12-17
Job specializations:
  • IT/Tech
    Cybersecurity
Job Description & How to Apply Below
Location: Lewes

We are Bugcrowd. Since 2012, we've been empowering organizations to take back control and stay ahead of threat actors by uniting the collective ingenuity and expertise of our customers and trusted alliance of elite hackers, with our patented data and AI-powered Security Knowledge Platform™. Our network of hackers brings diverse expertise to uncover hidden weaknesses, adapting swiftly to evolving threats, even against zero-day exploits.

With unmatched scalability and adaptability, our data and AI‑driven Crowd Match™ technology in our platform finds the perfect talent for your unique fight. We aim to create a new era of modern crowdsourced security that outpaces threat actors. Unleash the ingenuity of the hacker community with Bugcrowd, visit  Based in San Francisco and New Hampshire, Bugcrowd is supported by General Catalyst, Rally Ventures, Costanoa Ventures, and others.

Job Summary

At Bugcrowd, we handle application security assessment at an epic scale. As an Application Security Engineer (ASE) you will curate and manage the incoming security vulnerability submissions to some of the world's biggest companies' bug bounty programs. Here are just a few of the reasons why we are the best:

  • A tenure at Bugcrowd often means you have worked on not only one company's security program but potentially on hundreds.
  • As an ASE at Bugcrowd you will be exposed to the Internet's best security researchers and their cutting‑edge security testing methodologies. Our ASEs quickly become technically fluent in obscure/complex XSS, SQLi, XXE, IDOR, SSTI, SSRF, and many other vulnerability types. There is no other organization that offers the learning opportunity that Bugcrowd does.
  • You will be exposed to things outside of your comfort zone. We routinely run security programs for cars, IoT devices, embedded systems, mobile applications, and more!
  • We have an awesome team and tons of perks. We've even been selected as one of "The 10 Coolest Security Startups Of 2016" by
Essential Duties & Responsibilities

An ASE is responsible for the ongoing triage and validation services of Bugcrowd managed programs. Under the direction of the Director of Technical Operations, you will be doing the following:

Take incoming submission data and curate it for validity, accuracy, and severity as well as communicate directly with Bugcrowd's clients or researchers when additional information is required.

  • Handle Incident Response – escalating and communicating about the highest severity bugs to clients.
  • Strong knowledge of OWASP Top Ten type vulnerabilities.
  • A mature skill set in one scripting/development language, often to assist with the design or development of tooling for improving the triage/validation process. The ASE position is perfect for security professionals looking to take their skills to the next level.
Education, Experience, Skills, & Abilities
  • Bachelor's degree or previous security consulting experience
  • Published and demonstrated passion for security assessment research
  • High proficiency with Burp Suite (or any other interception proxy) and a working level of experience with other industry standard tools (nmap, sqlmap, anything included in Kali Linux)
  • Ability to execute on individual projects but still contribute to the team
  • Ability to complete tasks on time
  • Strong organization, influencing, and communication skills
Working Conditions

The ideal candidate must be able to complete all physical requirements of the job with or without reasonable accommodation.

Sitting and/or standing – Must be able to remain in a stationary position 50% of the time

Carrying and/or lifting – Must be able to carry/move laptop as needed throughout the work day.

Environment – Hybrid, work‑from‑home 80% of the time and in office 20%.

ADA Statement

Bugcrowd is committed to the full inclusion of all qualified individuals. In keeping with our commitment, Bugcrowd will take the steps to assure that people with disabilities are provided reasonable accommodations. Accordingly, if reasonable accommodation is required to fully participate in the job application or interview process, to perform the essential functions of the position, and/or to receive all other benefits and…

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