Senior Offensive Security Engineer

Monzo Bank

Senior Offensive Security Engineer enhancing Monzo's security through offensive security practices. Leading projects, simulating attacks, and mentoring team members in a fast-paced fintech environment.

Posted 6/5/2026full-timeRemote • 🇬🇧 United KingdomSenior💰 £76,500 - £90,000 per yearWebsite

Tech Stack

Tools & technologies

AWSCloudGoogle Cloud PlatformKubernetesMicroservices

About the role

Key responsibilities & impact

Leading offensive security projects from initial idea through to execution and reporting
Simulating real world attacks to uncover vulnerabilities across our systems, infrastructure, and products
Partnering with engineering and security teams to improve detection, response, and resilience
Bringing an attacker mindset into conversations - asking “what if?” and challenging assumptions
Producing proof-of-concept exploits to clearly demonstrate risk and drive meaningful fixes
Mentoring others in the team and acting as a highly independent technical lead on complex engagements

Requirements

What you’ll need

You have a strong attacker mindset and are naturally curious about how systems can be broken
You’ve got hands on experience in offensive security across areas like web, mobile, cloud, or infrastructure
You’re comfortable working across modern tech stacks (e.g. Kubernetes, AWS/GCP, microservices) or excited to learn
You can take ownership of ambiguous problems and drive them through to impactful outcomes
You enjoy collaborating with others and influencing teams to think more securely
You’re experienced in security testing and/or have relevant certifications (e.g. OSCP, CREST)

Benefits

Comp & perks

Incentive awards tied to your performance
£1,000 learning budget each year to use on books, training courses and conferences
We will set you up to work from home; all employees are given Macbooks and for fully remote workers we will provide extra support for your work-from-home setup
Flexible working hours and trust you to work enough hours to do your job well, and at times that suit you and your team.
Plus lots more! Read our full list of benefits.

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

offensive securityvulnerability assessmentproof-of-concept exploitssecurity testingcloud securityweb securitymobile securityinfrastructure securityrisk assessmentproblem-solving

Soft Skills

attacker mindsetcuriositycollaborationinfluencementoringindependenceownershipcommunicationcritical thinkingadaptability

Certifications

OSCPCREST