Senior Penetration Tester CHECK - Cloud & App Security

Instil; Bristol; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Annual bonus

Flexible hours

Pension scheme

Private healthcare

Wellbeing program

35 days holiday

Learning & development

Community volunteering

Job summary

Instil in the UK is seeking a Senior Penetration Tester with CHECK to join our growing team. You will deliver high‑quality engagements across infrastructure, cloud, web, and mobile applications for a diverse range of clients, including software, fintech, manufacturing, engineering, legal and public sector organisations.

This hands‑on role focuses on identifying and remediating security weaknesses, shaping our methodologies, and mentoring junior testers.

Qualifications

• Experience: penetration testing across infrastructure, cloud, web, and mobile apps.
• UK security clearance required (Current).
• Minimum 2+ years in penetration testing.
• Strong methodologies for web and network testing.
• In-depth OS knowledge: Linux, Windows, AD.
• Cloud environments familiarity and cloud security reviews.
• Proficient with BurpSuite Pro, Nmap, Nessus, Kali Linux.
• Scripting skills: Python, Shell, etc.

Skills

CTM status

UK security clearance

Penetration testing experience

Web & network testing

OS knowledge

Cloud security reviews

Penetration testing tools

Scripting languages

Tools

BurpSuite Pro

Nmap

Nessus

Kali Linux

Job description

Instil in the UK is seeking a Senior Penetration Tester with CHECK to join our growing team. You will deliver high‑quality engagements across infrastructure, cloud, web, and mobile applications for a diverse range of clients, including software, fintech, manufacturing, engineering, legal and public sector organisations.

This hands‑on role focuses on identifying and remediating security weaknesses, shaping our methodologies, and mentoring junior testers.