Remote Source

    Consultant, Application Security Penetration Tester

    United Kingdom
    Full-Time
    Mid (3-6 yrs)
    IT & Security
    Posted on January 9, 2026
    The Consultant works closely with Project Managers, Delivery Directors, and other Delivery team members to lead engagements, assessing the security of various types of client applications and supporting infrastructure against security best practices. The Consultant is a technical leader with broad technical skills, meeting the objectives of their engagements, collaborating with clients, mentoring teammates, and providing subject matter expertise across one or more technical domains. The Consultant is a trusted advisor to clients, and through objective testing and results reporting, supports the client in making well-informed, risk-based decisions to improve overall security posture.
    What You'll Do
  1. Working independently and collaboratively with a team to both lead and support
  2. Perform penetration testing on applications with complex technology stacks from both a: Blackbox & Whitebox perspective
  3. Dynamically flex your skills when assessing emerging or custom technologies
  4. Contextualize vulnerabilities and assess realistic impact to a client accounting for mitigating and aggravating factors
  5. Manage priorities and tasks to achieve utilization targets
  6. Operate with professionalism both internally and with clients
  7. Ensure quality reports and services are delivered efficiently and on time
  8. Maintains strong depth of knowledge in the practice area
  9. Collaborate with project managers, quality management, sales and other delivery team members to drive customer satisfaction and meet project deliverables
  10. Up to 10% travel
  11. What You'll Bring
  12. Application penetration testing and assessment tradecraft and methodologies (including browser-based, API)
  13. Strong working knowledge of at least two programming or scripting languages
  14. Strong understanding of security principles and industry best practices
  15. Minimum of 2 years’ experience in a consulting/professional services role
  16. Minimum of 2 years’ experience in Application Security and/or Software Development
  17. Proficiency in Web Application Penetration Testing
  18. Strong overall technical skills, with strong expertise in at least one of the following:
  19. Mobile Application Penetration Testing
  20. Thick Application Penetration Testing
  21. Hardware Penetration Testing
  22. Secure Code Review
  23. Container Penetration Testing
  24. Cloud Penetration Testing
  25. Network Active Directory Penetration Testing
  26. AI Penetration Testing
  27. Strong consulting skills including:
  28. Time management, performing adjacent tasks while ensuring on-time delivery, escalating issues as needed
  29. Verbal communication, leading client calls for project kickoffs and debrief
  30. Written communication & Report writing, for both executive audiences and technical staff
  31. High school diploma required
  32. Bonus Points
  33. UK CREST Certification and eligibility to be approved for and maintain UK SC level Clearance
  34. Strongly preferred CREST Certifications
  35. CREST Practitioner Security Analyst (CPSA)
  36. CREST Practitioner Threat Intelligence Analyst (CPTIA)
  37. AWAE, OSCP, OSCE, OSEE offensive security certifications
  38. Significant development and engineering backgrounds
  39. Cloud Service penetration testing tradecraft and methodologies across multiple service providers (e.g. AWS, GCP, etc.).
  40. Mobile platform and application penetration testing tradecraft and methodologies across both iOS and Android.
  41. Red/Purple Team tradecraft and methodologies
  42. Social engineering in all its forms
  43. AWS Certified Solutions Architect – Professional, AWS Certified Security, AWS Certified Advanced Networking, AWS Certified SysOps Administrator
  44. Network, Database, System administration experience and certifications
  45. Apply for this position

    Company:  Coalfire

    Provides cybersecurity and compliance services for tech, healthcare, and finance industries.
    ✅ Remote-First Company
    1001-5000 employees
    Cybersecurity
    HQ: United States