Senior Backend 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.

About Our Engineering Teams: We have around 400 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.

Your day-to-day: This role is all about collaborating with your team to make a difference to your customers. As a backend engineer you’ll work in a squad alongside other disciplines like product managers, marketers, user researchers, designers, mobile engineers, web engineers, data analysts, business analysts, writers and more! Together you'll build and support a particular part of Monzo. Our squads belong to our wider collectives (a word we use to describe self‑governing business units of ~100 people). They are: Core Banking, Business Banking, Wealth, Borrowing, Growth, Payments, Platform, Fincrime, Security & Expansion. All of our collectives are doing innovative work, many of which have machine learning and AI at the forefront – from fighting financial crime to building smarter financial tools – and you may have the opportunity to join a collective that gives you direct exposure to this exciting space.

How We Work: 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. Set up a work schedule that delivers impact and fits your life: At Monzo, we value connections, flexibility, and wellbeing. We keep our meetings during core hours to stay connected and believe in maintaining work/life balance. You’ll be empowered to manage your work in a way that suits you and your team, giving you the freedom for children drop‑offs and pick‑ups, walking your dog or adventurous cat, avoiding peak commuting times or gym slots, appointments, or supporting your family in an emergency.

You Should Apply If: you have strong experience working on the backend of a technology product; you want to be involved in building a product that you (and the people you know) use every day; you have a product mindset: you care about customer outcomes and you want to make data‑informed decisions; you’re comfortable working in a team that deals with ambiguity; you’re interested in distributed systems and writing resilient software; you have some experience with strongly‑typed languages (Go, Java, C, Scala etc.); you think you’d enjoy the kind of work we’re doing.

What You’ll Be Working On: We hire very technically agnostic so whilst we use the below technologies we do not expect prior knowledge, you will be fully supported in our organised onboarding to get up to speed in the below: Go to write our application code; Cassandra for most persistent data storage; Kafka for our asynchronous message queue; Kubernetes and Docker to schedule and run our services; Envoy Proxy for RPC; AWS for most of our production infrastructure and GCP for most of our data infrastructure; React for our public web apps and internal tools.

The Interview Process: Our interview process involves three main stages: 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.

What’s In It For You: £95,000 - £130,000 base salary + stock options; 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.

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.