Principal Software Engineer

New Yesterday

Job Description

Principal Software Engineer (Java)


London – 1 day a week onsite


Join a FinTech Powering the Future of Payments

Are you a seasoned individual contributor looking for a step up into a senior position within a high-performing team within the world of Banking/Payments? Are you passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that powers instant payments for some of the world’s largest Banks.


We’re hiring on behalf of a leading payments consultancy, delivering cutting-edge solutions that integrate seamlessly with bank infrastructure to enable real-time, secure transactions across the globe.



What You’ll Be Doing

You’ll be the focal point of a high-performing engineering team building asynchronous, event-driven systems using modern Java technologies.


  • Design and build scalable, high-availability systems processing millions of real-time transactions
  • Work with Java 17+, Spring WebFlux, AKKA, Kafka, and more
  • Write clean, testable code using TDD and BDD
  • Contribute to architectural decisions in a fast-evolving codebase
  • Collaborate within Agile teams (Kanban/Scrum)


What You Bring

We’re looking for engineers who are pragmatic, performance-focused, and thrive on solving complex distributed systems problems.


  • Strong hands-on experience with Java 11+ (ideally Java 17)
  • Solid knowledge of Reactive Programming (e.g., Spring WebFlux, AKKA)
  • Experience with event-driven architecture, real-time messaging systems (Kafka, JMS)
  • Familiarity with asynchronous request handling, scalability, and system resilience
  • Agile mindset, with TDD/BDD and CI/CD experience

Bonus: Background in Banking/Payments is helpful but not required – if you’ve built high-performance, real-time systems, we want to talk to you.


What’s In It for You

  • £100,000 – £115,000 base salary (DOE)
  • 20% bonus
  • Work with cutting-edge tech on globally impactful systems
  • Hybrid working – 1 day a week (or more if you’d like!)
  • Opportunity to collaborate with major global banks
  • Fast-paced, product-led environment where your voice matters



If you're a motivated Senior/Principal/Staff Java Software Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us.

Apply
Location:
London
Job Type:
FullTime
Category:
Technology

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