Senior Offensive Security Engineer

Were on a mission to make money work for everyone.

Were waving goodbye to the complicated and confusing ways of traditional banking.

After starting as a prepaid card our product offering has grown a lot in the last 10 years in the UK. As well aspersonal and business bank accounts we offer joint accounts accounts for 16-17 year olds a free kids account and credit cards in the UK with more exciting things to come beyond. Our UK customers can also save invest andcombine their pensions with us.

With our hot coral cards and get-paid-early feature combined with financial education on social media and our award winning customer service we have a long history of creating magical moments for our customers!

Were not about selling products - we want to solve problems and change lives through Monzo

London/Cardiff/UK Remote 76500 - 90000 Incentive awards tied to your performance Benefits

Our Offensive Security team

Youll be joining Monzos Offensive Security team part of our wider Security collective. Were a team of curious hands on security professionals who think like attackers to help keep Monzo and our customers safe. We work across everything from customer facing products and mobile apps to cloud infrastructure internal systems and emerging technologies like AI.

Our role is to find weaknesses before others do. Through security testing red and purple teaming and adversarial research we uncover vulnerabilities demonstrate real-world impact and help teams build more secure systems. We work closely with engineers and security partners across Monzo bringing an attacker mindset into the room and helping shape security decisions through collaboration curiosity and practical expertise.

Youll play a key role by...

• 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

Wed love to hear from you if

• You have a strong attacker mindset and are naturally curious about how systems can be broken
• Youve got hands on experience in offensive security across areas like web mobile cloud or infrastructure
• Youre 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
• Youre experienced in security testing and/or have relevant certifications (e.g. OSCP CREST)

Not ticking every box Thats totally okay! Studies show that women and people of colour might hesitate to apply unless they meet every single requirement. At Monzo were dedicated to creating a diverse and welcoming team. If youre passionate about this role and keen to learn and grow with us we encourage you to apply even if you dont have everything thats listed just yet. Drop us your application wed love to hear from you!

Whats in it for you
76500 - 90000Incentive awards tied to your performance
This role can be based in our London office but were open to distributed working within the UK (with ad hoc meetings in London)
We offer flexible working hours and trust you to work enough hours to do your job well and at times that suit you and your team.
1000 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.
Plus lots more! Read our full list of benefits.

The application journey has 3 key steps

• 30 min recruiter call
• 30 min call with the hiring manager
• 2 hours of technical and behavioural interviews

This process should take around 3-4 weeks - your schedule is really important to us so we promise to be as flexible as possible!

We have some guidelines on using Artificial Intelligence (AI) to ace an application and interview at Monzo. You can read them here.

Well only close this role once we have enough applications for the next stage. Please submit your application as soon as possible to make sure you dont miss out.

#LI-OS1 #LI-REMOTE

Equal opportunities for everyone

Diversity and inclusion are a priority for us and were making sure we have lots of support for all of our people to grow at Monzo. At Monzo were embracing diversity by fostering an inclusive environment for all people to do the best work of their lives with us. This is integral to our mission of making money work for everyone. You can read more in our blog 2026 Diversity and Inclusion Report and 2025 Gender Pay Gap Report.

Were an equal opportunity employer. All applicants will be considered for employment without attention to age ethnicity religion sex sexual orientation gender identity family or parental status national origin or veteran neurodiversity or disability status.

If you have a preferred name please use it to apply. We dont need full or birth names at application stage