Staff Software Engineer, Product Integrity

📍London / UK Remote | 💰 Staff Engineer (L60) £115,000 - £150,000 + Benefits | Technology - Engineering 

About our Engineering Teams

We have around 450 engineers out of roughly 5,000 people in total - and we have big ambitions. There are many interesting challenges ahead, and we're happy for people to move between teams or to specialise, whatever you prefer. As an engineer here you'd be able to work directly with anyone across the company, and we run regular knowledge-sharing sessions so you’ll learn heaps about everything from how banks work to effective communication.

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

About Product Integrity

Our mission is to help Monzo scale effectively, empowering our technology teams to build magical experiences for our customers all over the world. 

Product Integrity exists to help Monzo scale product quality without scaling cost, risk, or manual effort — especially as we expand across markets, languages, and regulatory contexts.

Our focus is on solving a small number of hard, high-leverage problems:

• Understanding and reducing the true Cost of Quality (CoQ)
  We aim to build a credible, trusted model that makes quality costs visible — where defects, rework, incidents, and manual checks are coming from — and use that insight to materially reduce waste and risk over time.
• Scaling quality across markets and locales
  As Monzo expands internationally, we need ways to validate correctness, localisation, and customer experience without relying on manual, market-by-market QA. This includes solving localisation QA at scale and maintaining confidence as products span multiple countries, currencies, and languages.
• Building confidence through signal, not ceremony
  Teams should be able to clearly see where they have strong quality signals — and where they don’t — for critical customer journeys. The goal isn’t more tests, but the right signal in the right places to support fast, confident delivery.
• Reducing noise while preserving our incident culture
  We want to catch and resolve small issues early, before they escalate into SEVs, while still preserving Monzo’s strong, values-driven approach to incidents and learning.
• Using AI to fundamentally change the economics of quality
  We’re exploring how AI can help us move from reactive, manual quality work to proactive, scalable systems — from test generation and defect triage to root-cause analysis — increasing leverage across the organisation rather than adding process.

At its core, Product Integrity is about making high quality the default outcome as Monzo grows — not by slowing teams down, but by giving them better systems, better signal, and better trade-offs.

Staff Engineer responsibilities

A Staff Engineer at Monzo is a technical (IC) leadership position. You will have wide influence, working with other collectives to grow Monzo.

More specifically, you’ll:

• Expect to be hands on and technical with code, using your software engineering and system building skills and expertise to lean in and solve deep technical challenges
• Drive behavioural changes and accountability across Monzo using data — influencing technical and non-technical stakeholders beyond a single team or domain
• Set both technical and strategic direction in an area that cuts across backend systems, data pipelines, mobile clients, CI/CD, release processes, and analytics
• Build a deep understanding of our platform and then work to strengthen the reliability surface that sits between teams - building and enhancing the tools, patterns and guardrails that make resilient choices the easy ones
• Promote and maintain a culture where every engineer feels supported to feel confident in Monzo’s quality and product integrity
• Understand several work-streams across your group, keeping enough context to regularly provide technical advice and challenge to other engineers
• Use your expert knowledge and experience to lead architectural discussions for the most complex systems in the collective. You’ll do this in order to arrive at solutions that are robust and optimal given the context 
• Championing high standards by celebrating success and providing constructive feedback to help the team improve
• Foster a culture of quality within your collective. Proactively champion measures to test work, and make this easy
• Pro-actively mentor, sponsor and up-level engineers

🤩What we’re looking for…

To succeed in this role, you will need a strong background in both modern platform tooling and practical software development.

• Strong software engineering foundations, with significant experience designing, building, testing, and operating robust backend services using strongly-typed languages.
• Proven expertise in testing and quality at scale, including E2E testing, reliability practices, and signal-driven quality approaches.
• Experience designing or evolving platform tooling or shared systems used by many teams.
• The ability to influence technical direction without formal authority, using data, clarity of thinking, and strong communication.
• Comfort working across ambiguity and evolving problem spaces, balancing pragmatism with long-term impact.
• A track record of improving developer experience and delivery outcomes through better systems, tooling, or practices.

This is a systems and leverage role, not a test automation role. You’ll focus on solving quality problems at scale and building tools and capabilities that make high quality the default across Monzo.

What you’ll be using/ What you’ll be working on: 

We rely heavily on the following tools and technologies:

• Go to write our application code (there’s an excellent interactive Go tutorial here)
• Cassandra for most persistent data storage
• Kafka for our asynchronous message queue
• Kubernetes and Docker to schedule and run our services 
• AWS for most of our production infrastructure and GCP for most of our data infrastructure.
• React for internal Web dashboards
• Feast for storing our features along a variety of tools to train and deploy models.

🤩We’d love to hear from you if… 

• You have a track record of technical excellence, delivering resilient systems, ideally behind consumer products
• You have technically led large teams to solve complex product challenges and manage trade-offs.
• You have experience working on Backend Systems, Data-intensive systems or real-world ML deployments
• You want to be involved in building and protecting a product that you (and over 14 million others) use
• You have a quantitative mindset: you care about outcomes and you make data-informed decisions
• You’re comfortable working in a team that deals with ambiguity and have experience helping your team and partner team resolve that ambiguity 

What’s in it for you

💰 £115,000 - £150,000 base salary ➕ plus stock options 

✈️We can help you relocate to the UK 

✅ We can sponsor visas.

📍This role can be based in our London office or remotely across 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 

We're usually always hiring for Backend Engineers, so there's no closing date for this job.

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