Senior Fullstack Engineer - Business Banking

At Oak North, we’re on a mission to empower the UK’s most ambitious businesses. Since 2015, we’ve lent over $18 billion across the UK and US, helped create more than 58,000 new homes and 36,000 new jobs, and supported hundreds of thousands of personal savers — all while fuelling the UK economy.

The Business Banking Payments squad's mission is to deliver a fast, reliable, and seamless payment experience that empowers our customers to move money effortlessly and securely. We own the full payments journey, from transaction initiation in the mobile and web frontends to the processing in the backend, including Fraud and AML checks and connecting to the payments schemes, ensuring that businesses can focus on growth while we handle the complexity behind the scenes.

• Have a strong technical background, including 5+ years of experience designing and engineering large-scale systems
• Measure your success in terms of business impact, not lines of code
• Internalise the best ideas from across the organisation, humbly setting a vision that others can get behind
• Embrace Dev Ops culture:
  You build it, you run it
• Work well cross-functionally and earn trust from co-workers at all levels
• Care deeply about mentorship and growing your colleagues
• Prefer simple solutions and designs over complex ones
• Enjoy working with a diverse group of people with different areas of expertise.
• You challenge the existing approach when you see the cliff edge racing towards us, but also get on board once the options have been debated and the team has made a decision.
• You're a broad thinker and have the capability to see the potential impact of decisions across the wider business
• Utilise Generative
  
  AI:
  Leverage GenAI tools to increase productivity and enhance decision‑making processes within the role
• It would be an added bonus if you have experience with/knowledge of transaction monitoring, financial crime prevention, AML, and fraud detection.
• Nice to have - Familiarity with transaction systems, statements, and reconciliation processes

• We're pragmatic about our technology choices. These are some of the things we use at the moment:
• Python
• Postgre
  
  SQL, Big Query, MySQL
• Type Script, React, styled-components
• Jest, React Testing Library, Cypress, pytest
• AWS, GCP
• ECS Fargate, Docker, Terraform, Git Hub Actions

• We expect you to work in these ways, as well as encouraging and enabling these practices from others:
• Collaborate - We work in cross‑functional, mission driven, autonomous squads that gel over time. We pair program to work better through shared experience and knowledge.
• Focus on outcomes over outputs ✅ - Solving a problem for users that translates to business results is our goal. Measurements focused on that goal help us to understand if we are succeeding.
• Practice continuous improvement - We optimise for feedback now, rather than presume what might be needed in the future and introduce complexity before it will be used. This means we learn faster. We share learnings in blame‑free formats, so that we do not repeat things that have failed, but still have confidence to innovate.
• Seek to understand our users - We constantly seek understanding from data and conversations to better serve our users' needs, taking an active part in research to hear from them directly and regularly.
• Embrace and enable continuous deployment - Seamless delivery of changes into an environment - without manual intervention - is essential for us to ensure that we are highly productive; consider resiliency; and practice security by design.
• Test outside‑in, test first - TDD keeps us confident in moving fast, and deploying regularly. We want to solve user problems, and so we test with that mindset - writing scenarios first, then considering our solution; coupling tests to behaviour, rather than implementation.
• You build it, you run it ⚙️ - We embrace Dev Ops culture and end‑to‑end ownership of products and features. Every engineer, regardless of their role, has the opportunity to lead delivery of features from start to finish.
• Be cloud native ☁️ - We leverage automation and hosted services to deliver resilient, secure services quickly and…