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 Youll 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

Youll 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.