Senior Staff Engineer - Platform

Senior Staff Engineer – Platform

Monzo Bank

Location: London / UK Remote

Salary: £135,000 - £184,000 + Share Options

We are looking for a Senior Staff Engineer (L70) to join our Platform collective. This is a technical leadership role with company‑wide influence, working closely with cross‑functional teams to improve Monzo’s platform resilience and enable our engineering community to build reliable, performant systems.

• Be hands‑on and deeply technical with code and infrastructure, solving complex technical challenges.
• Partner with the Engineering Director for Platform and other ICs to provide technical leadership around resilience across Monzo.
• Build a deep understanding of the platform and strengthen the reliability surface between teams by enhancing tools, patterns and guardrails.
• Promote and maintain a culture where every engineer feels supported to design, build and operate reliable systems at global scale.
• Understand cross‑team work streams, regularly providing technical advice and challenging peers.
• Lead architectural discussions for the most complex systems, arriving at robust, optimal solutions given context.
• Champion high standards by celebrating success and providing constructive feedback.
• Foster a culture of quality, championing measures to test work and making quality tooling easy.
• Pro‑actively mentor, sponsor and up‑level engineers.

• Solid software engineering foundations – robust backend services written in strongly typed languages.
• Hands‑on experience with AWS, GCP and Kubernetes; deep experience designing and maintaining global, resilient cloud systems.
• Infrastructure as Code expertise (e.g., Terraform) and a mindset of solving problems through automation.
• System curiosity – a drive to investigate complex issues and understand how distributed applications fail and scale.
• Platform mindset – enthusiasm for building a platform that enables success for everyone at Monzo, focusing on reliability, performance and developer experience.
• Comfort with ambiguity in a fast‑paced, evolving environment.

• Go for application code
• Cassandra for persistent data storage
• Kafka for asynchronous messaging
• Kubernetes & Docker for service orchestration
• AWS (production) and GCP (data infrastructure)
• React for internal web dashboards
• Feast for feature‑flag and model deployment orchestration

Competitive salary, share options and a comprehensive benefits package.

Relocation support to the UK and visa sponsorship available.

Flexible working hours and support for remote work with provided Mac Books.

£1,000 annual learning budget for books, training courses and conferences.

Additional benefits available – see our full list of benefits.

• Recruiter Call
• Initial Call
• System Design Interview
• Take‑home Task or Pair‑Coding Exercise
• Final Interview – behavioural and leadership components

The process typically takes 3–4 weeks. We’ll be flexible to accommodate your schedule.

Monzo is an equal‑opportunity employer. All applicants will be considered for employment without consideration of age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, veteran, neurodiversity or disability status. We welcome people with preferred names and do not require full or birth names at the application stage. Monzo embraces diversity by fostering an inclusive environment for all people to do the best work of their lives.

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.