Staff Backend Engineer

Barcelona, Spain

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🚀 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 ❤️

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📍Barcelona, Spain | 💰 Base salary for this role is depending on experience + benefits | Hybrid model: 3 days a week in the office

About the Position

We have over 650 engineers across Monzo who design and build our in-house banking platform. We have big ambitions for the future, and technology plays a big role in creating a bank our customers want, so engineers at Monzo collaborate across disciplines to solve interesting challenges throughout the company.

These range from the products our customers use every day to underlying infrastructure, security, payments and finance, customer operations, financial crime, and data, to name just a few areas. As a bank, there is scope for impact across a huge number of opportunities.

We contribute to open source software as much as possible. Our blog is a good place to learn even more about what we do!

Responsibilities

• Collaborate with cross-functional teams to build and support a particular part of Monzo.
• Work in a squad alongside product managers, marketers, user researchers, designers, mobile engineers, web engineers, data analysts, business analysts, writers, and more.
• Build and support a part of Monzo belonging to our wider collectives.

Requirements

• Strong experience working on the backend of a technology product.
• A product mindset: you care about customer outcomes and you want to make data-informed decisions.
• Comfortable working in a team that deals with ambiguity.
• Interested in distributed systems and writing resilient software.
• Experience with strongly-typed languages (Go, Java, C, Scala, etc.).

Technologies

• Go to write our application code.
• Cassandra for most persistent data storage.
• Kafka for our asynchronous message queue.
• Envoy Proxy for RPC.
• Kubernetes and Docker to schedule and run our services.
• AWS for most of our infrastructure.
• React for internal web dashboards.

We Offer

• Base salary range for this role is depending on experience + equity + stock options & benefits.
• Flexible working hours.
• Learning budget of €1,200 a year for books, training courses, and conferences.

About the Company

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 the application stage 😊

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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. You can read more in our blog, 2026 Diversity and Inclusion Report and 2025 Gender Pay Gap Report.

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👤 Identity Survey

Our goal at Monzo is to make money work for everyone. To do that, working at Monzo must work for everyone. We want to create an equitable, engaged, and innovative workplace which gives people from all backgrounds the support they need to thrive and grow.

Making Monzo work for everyone starts right at the beginning of every Monzonaut's journey: when they apply to work here. This demographic survey will help us better understand the people who apply to work at Monzo. It'll help us see how different groups progress through our hiring process, and where we need to make improvements to be more inclusive. If you choose to fill it out, all of the information you give us is:

• Voluntary. And we've included a "prefer not to say" option for every question. It'd be helpful if you still fill out the survey even if you choose "prefer not to say" for every question, as it's useful for us to understand & record this. We won't know if you choose to fill this survey in or not.
• Anonymous to Monzo. We can't tie your responses to you and they won't make a difference to the outcome of your application. We'll only use grouped responses for equal opportunities monitoring in our hiring process.

For more information on how we'll use this data, please read our candidate privacy notice.

By filling out this survey, you agree that we can use your responses for the purposes we've mentioned above. You are not letting us know if we need to make any adjustments to the hiring process because of disability or neurodiversity - to do this please email us.

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