About Line4
We are an AI engineering firm built by operators who have led some of the UK's most successful fintech companies. We specialise in financial services, regulated industries, and enterprise environments where security, compliance, and speed all matter.
Who we are
Operator-founded. AI-native. Built for speed.
Line4 was founded by engineering leaders who have built and scaled technology at ClearBank, OakNorth Bank, and Seccl. We know what it takes to deliver in regulated, high-stakes environments because we have done it ourselves.
Our AI Pods are small, dedicated engineering teams powered by agentic AI. They embed within your security perimeter to deliver real outcomes in days, not months. Whether you need to transform legacy systems, build new products, or accelerate your AI adoption, our pods are designed to move fast without cutting corners.
We work primarily with financial services companies, regulators, and enterprises that need engineering teams who understand compliance, security, and operational complexity.
Our approach
Small, focused AI Pods embedded within your security perimeter. Not outsourcing. Partnership.
Domain expertise
Our pod members have worked across the fastest growing UK fintechs, established banks, regulators, and embedded finance platforms. We understand compliance, operational realities, and the regulatory environment your products operate in.
Security-first delivery
Every AI Pod operates within your security perimeter and governance framework. Our agentic workflows are designed for regulated environments: auditable, controlled, and fully compliant with your information security policies.
AI-native from day one
AI is not an add-on. Our pods are built around agentic workflows that accelerate every stage of delivery, from discovery and assessment through to build, test, and deploy. Secure by design, fast by nature.
Our team
Small teams that scale fast
We maintain a vetted network of full-stack pod members across the UK, Brazil, and Eastern Europe. Every pod member is security-cleared, technically assessed, and experienced in regulated delivery. All locations share the same capabilities.
When you need to move, we can assemble and deploy an AI Pod in days, not months. Need to scale? We add pods, not headcount complexity. Each pod operates within your security perimeter and governance framework, and can align to your time zones when needed.
Leadership
Built by operators, not observers
Tom Harris
Co-founder, Director and Technical Advisor
CTO of OakNorth Bank and active SMF24 approved by the FCA. Former CTO of ClearBank and CTO of Seccl. Tom has led engineering organisations through hypergrowth in some of the UK's most successful fintech companies.
Andrew Gibson
Co-founder and Chief AI and Technology Officer
Nearly six years at ClearBank from Lead Developer to Senior Technology Manager. Former CTO of Sustain3, an AI-native startup. A specialist in cloud architecture for fintechs, Andrew has launched multiple generative AI solutions into production in regulated environments.
Company information
Ready to talk?
Book a conversation with our team to explore how an AI Pod can help your organisation.