Senior Fullstack Engineer - Business Banking - Core Banking

Company: OakNorth

Location: London

Posted: April 11th, 2026

Overview

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At OakNorth, 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.

Team Mission

The Core Banking team owns the foundational systems that power our financial products and ensure the integrity of our data and processes.

Own the financial accounts domain, including the design, creation, and lifecycle of financial products, ensuring they are compliant, scalable, and seamlessly integrated with the ledger and third-party systems.

Manage our ledger (Thought Machine Vault Core), covering its integration, data integrity, and technical migrations, while maintaining a close partnership with the Thought Machine team.

Build resilient, event-driven systems that ensure data consistency and traceability across internal platforms and external services.

Support financial and regulatory reporting, including reconciliations and compliance obligations such as FSCS.

Provide the systems and data models that ensure auditability, accuracy, and trust, from customer balances to external reports

The role

Technology

How we expect you to work

How we expect you to behave

What makes working here better

About Us We\'re OakNorth Bank and we embolden entrepreneurs to realise their ambitions, understand their markets, and apply data intelligence to everyday decisions to scale successfully at pace. Banking should be barrier-free. It\'s a belief at our very core, inspired by our entrepreneurial spirit, driven by the unmet financial needs of millions, and delivered by our data-driven tools. And for those who love helping businesses thrive? Our savings accounts help diversify the high street and create new jobs, all while earning savers some of the highest interest on the market. But we go beyond finance, to empower our people, encourage professional growth and create an environment where everyone can thrive. We strive to create an inclusive and diverse workplace where people can be themselves and succeed. Our story OakNorth Bank was built on the foundations of frustrations with old-school banking. In 2005, when our founders tried to get capital for their data analytics company, the computer said \"no\". Unfortunately, all major banks in the UK were using the same computer - and it was broken. Why was it so difficult for a profitable business with impressive cashflow, retained clients, and clear commercial success to get a loan? The industry was backward-looking and too focused on historic financials, rather than future potential. So, what if there was a bank, founded by entrepreneurs, for entrepreneurs? One that offered a dramatically better borrowing experience for businesses? No more what ifs, OakNorth Bank exists.

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