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F5 Consultants Linkedin · Posted 2mo ago

Senior Backend Developer

London, Westminster, United Kingdom

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Indexed description

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

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