Senior Platform Engineer

We’re on a mission to make money work for everyone. We’re 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 as personal 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 and combine 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! We’re not about selling products - we want to solve problems and change lives through Monzo.

Locations & Flexible Working

Our main tech hub is in London, but our engineers live everywhere in the UK—from Brighton to the Western Isles. We value meeting in person but there’s no pressure to come into the office, even if you’re nearby. We believe you’ll do your best work if you are where you want to be. If you live outside of London and we ask you to come into the office, Monzo will support you with the costs. Our offices are naturally social, especially Tuesdays, Wednesdays and Thursdays, which happen to line up with our twice-weekly Monzo lunches & treat Thursdays. Teams also schedule time together often for work and play – in or around the office, or online.

What you’ll be working with

As a Platform Engineer at Monzo, you will work across the full breadth of our core infrastructure and application platform. This role involves a balanced split of responsibilities between two critical areas: Platform & Infrastructure Engineering and Software & Backend Engineering.

Key Responsibilities

• Platform & Infrastructure Engineering: Enhancing and maintaining our foundational tools and systems. Working hands‑on with our Kubernetes clusters, AWS infrastructure, and configuration management using Terraform. Integrating and managing various open‑source components to provide robust, scalable primitives for our engineering teams.
• Software & Backend Engineering: Building and maintaining the services that abstract and orchestrate our infrastructure. Designing and implementing backend services (APIs, controllers, etc.) that provide a simplified, self‑service experience for other engineers. Developing software for complex projects such as infrastructure migrations, high‑scale traffic management, or security tooling.

Tools & Technologies

We rely heavily on Go, Kubernetes, AWS and GCP, Terraform and Envoy Proxy for our RPC service mesh. Direct experience in these technologies is not required and our interview process can be completed in any language.

Desired Skills & Experience

• Software Engineering Foundation: Significant professional experience writing, testing, deploying robust backend services using strongly typed languages.
• Cloud & Container Experience: Hands‑on experience working with AWS and/or GCP, and proficiency with Kubernetes.
• Automation & Infrastructure as Code: Experience with Infrastructure as Code (e.g., Terraform).
• System Curiosity: Curious about systems, enjoy diving deep to investigate complex issues, and understand how modern distributed applications fail and scale.
• Platform Mindset: Excited to build a platform that enables success for everyone at Monzo, focusing on reliability, performance, and developer experience.
• Comfort with Ambiguity: Comfortable working in a fast‑paced team that deals with ambiguity and evolving requirements.

We’re on the look out for L40 & L50 Platform Engineers at the moment, you can read more in our Engineering Progression Framework.

Interview Process

• Initial Call
• Take home task or pair coding exercise
• Final interview: including a system design and a behavioural interview

Our average process takes around 4 weeks but we will always work around your availability. One of our engineers has written a detailed blog on their experience through this process, for extra details, hints and tips please see here.

What’s in it for you

• £95,000 - £130,000 base salary
• Incentive Awards tied to your performance
• We can help you relocate to the UK
• We can sponsor visas
• This role can be based in our London office, but we’re 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, at times that suit you and your team.
• Learning budget of £1,000 a year for books, training courses and conferences
• And much more, see our full list of benefits here

Equal Opportunities & Diversity

Equal opportunities for everyone. Diversity and inclusion are a priority for us and we’re making sure we have lots of support for all of our people to grow at Monzo. At Monzo, we’re 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.

We’re 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 don't need full or birth names at application stage.

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