Senior Backend Developer
Node.js, TypeScript, AWS, Kubernetes, REST APIs, Terraform, EventBridge, SQS, and CI/CD. You’ll join a high-growth UK payments fintech building scalable B2B payments infrastructure and event-driven distributed systems. As a Senior Engineer, you’ll shape architecture, own features end-to-end, and mentor engineers.
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Senior Backend Software Engineer - FinTech
£120,000 + Share Options & Benefits Flexible office policy | South London
Tech Stack: Node.js · TypeScript · AWS · Kubernetes · REST APIs
I'm partnering with a high-growth UK payments fintech that's fundamentally rethinking how merchants and consumers pay for goods and services.
This isn't a company doing incremental work, they're building genuinely disruptive infrastructure at scale, and they're now bringing on multiple Senior Engineers to help define the next chapter of growth.
The Engineering Environment
A modern, cloud-native platform engineered for serious scale:
Node.js, TypeScript
React (frontend)
AWS cloud infrastructure
Kubernetes
Terraform (Infrastructure as Code)
Architecture Highlights
Event-driven, distributed systems (EventBridge, SQS)
Public-facing REST APIs
Fully automated CI/CD pipelines
Data science and ML-driven personalisation
Scalable B2B payments infrastructure
The Role
As a Senior Software Engineer, you'll be working be shaping architecture, not just implementing it:
Lead the design and evolution of B2B APIs and payments infrastructure
Contribute to architectural decisions across distributed systems
Partner with Product and UX during discovery and solution design
Own features end-to-end, from concept through to production
Mentor engineers and raise the bar on engineering standards
Champion best practices across testing, CI/CD, and security
What They're Looking For
8+ years in software engineering, with at least 2 years in financial services (payments, banking, or wealth) or a high-volume transaction environment (eCommerce, gaming, betting, or streaming)
Strong backend engineering experience with Node.js and TypeScript
A track record of building and maintaining public REST APIs
Solid AWS experience (Terraform a plus; Kubernetes a strong bonus)
Comfort working within distributed, event-driven architectures
A delivery-focused mindset as you take ownership and see things through
At ease in fast-moving, scale-up environments where ambiguity is the norm