Senior Staff Backend Engineer

Cardiff, London or Remote (UK)

🚀 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 the Position

We are looking for a Senior Staff Backend Engineer to join our team in London, Cardiff, or remotely within the UK. As a Senior Staff Engineer, you will play a hands-on engineering leadership role, shaping the technical and product direction of our collective, and ensuring alignment with company-wide priorities.

Responsibilities

• Partner with Engineering Directors to shape the technical and product direction of a collective, providing leadership across multiple squads (30–70+ engineers) and ensuring alignment with company-wide priorities.
• Be hands-on in both coding and architecture, leading from the front.
• Partner closely with Product and Design leadership to define strategy, shape roadmaps, and make high-quality trade-offs that maximize business and customer impact across the collective.
• Mobilise teams across your collective around high-impact problems, creating clarity, alignment, and momentum, injecting urgency when needed, or slowing things down to ensure safety and long-term sustainability.
• Lead and influence architectural direction for the most complex systems, ensuring cohesive, scalable designs across multiple teams and aligning local decisions with the broader system strategy.
• Set and uphold a high bar for technical excellence across the collective, driving improvements in quality, reliability, and scalability, and fostering a culture where engineers hold each other to that standard.
• Proactively mentor, sponsor, and develop senior engineers and future leaders, multiplying your impact by enabling others to operate at a higher level.

Requirements

• Track record of leading complex, high-impact systems and driving technical direction across multiple teams.
• Strong technical judgment combined with product and business awareness, making pragmatic trade-offs.
• Experience with scalable backend, distributed, or data-intensive systems.
• Comfortable operating in ambiguous problem spaces, helping teams define direction and execute.
• Ability to influence and align senior stakeholders across engineering, product, and beyond.
• Care about outcomes and impact, using data to guide decisions.
• Enjoy mentoring and raising the bar for other engineers.

Technologies

• Go for application code.
• Cassandra for persistent data storage.
• Kafka for asynchronous message queue.
• Kubernetes and Docker for scheduling and running services.
• AWS for production infrastructure and GCP for data infrastructure.
• React for internal web dashboards.
• Feast for storing features along with various tools to train and deploy models.

We Offer

• Competitive base salary: £155,000 - £200,000 + Equity.
• Relocation assistance to the UK.
• Visa sponsorship available.
• Flexible working hours and trust to manage your schedule.
• £1,000 learning budget each year for books, training courses, and conferences.
• Macbooks for all employees, with extra support for fully remote workers.
• Plus many more benefits.

About the Company

At Monzo, we’re on a mission to make money work for everyone. We value diversity and inclusion, fostering an inclusive environment for all people to do the best work of their lives with us. We’re an equal opportunity employer, and 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.

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