Principal Software Engineer High-growth, Purpose-Led and A funded Fintech Hybrid

Principal Software Engineer High-growth, Purpose-Led and A funded Fintech Hybrid - London

Python, TypeScript, React

A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally - with real impact at scale.

The company operates at the intersection of technology and social impact, offering innovative and groundbreaking tools that enable financial stability across the world - all via a modern, mobile-first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core.

The Opportunity

As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data, and platform teams to deliver high-impact features that directly improve user financial wellbeing.

This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact.

What You'll Do:

• Design and implement distributed systems that are resilient, scalable, and secure.
• Own technical decision-making across architecture and implementation - selecting the right tools and patterns to meet evolving business needs.
• Collaborate cross-functionally with product managers, designers, and analysts to build features that deliver tangible value.
• Contribute to technical strategy, support platform scalability, and lead by example through code reviews and mentoring.
• Maintain a user-centred mindset, constantly measuring and iterating on how engineering decisions translate into product value.

Technical Environment:

• Languages & Frameworks: Python, TypeScript, React, Svelte
• Infrastructure & Tools: AWS, PostgreSQL, Snowflake, CI/CD pipelines
• Ways of Working: Agile squads, continuous delivery, outcome-oriented culture

You'll work in a collaborative, engineering-led environment where autonomy, accountability, and thoughtful innovation are valued over process-heavy delivery.

What You Bring

• Proven experience designing and delivering scalable backend systems in high-growth or high-load environments.
• Strong technical depth in backend development, with working knowledge of frontend frameworks or data infrastructure a plus.
• Demonstrated ability to lead by example - writing clean, maintainable code and supporting others through mentoring or technical leadership.
• A pragmatic, product-oriented approach to engineering: you care about elegant solutions, but you care even more about user outcomes.
• Prior experience in fintech or regulated environments is beneficial, but not essential.

If you are an innovative and experienced Senior Software Engineer with a passion for using maths based solutions to solve complex business problems, then please apply now with your latest CV.