Principal Java Software Engineer

JR United Kingdom; Norwich; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

A leading payments consultancy is seeking a Principal Java Software Engineer to shape the future of payments by developing scalable systems for real-time transactions. You'll work in a hybrid setup with 1-2 days in the London office, utilizing cutting-edge technology in a fast-paced environment where your contributions directly impact major financial institutions.

Benefits

20% performance bonus

Work with cutting-edge tech

Opportunity to collaborate with major global banks

Fast-paced, product-led environment

Qualifications

• 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).

Responsibilities

• Design and build scalable, high-availability systems processing millions of real-time transactions.
• Collaborate within Agile teams (Kanban/Scrum).
• Contribute to architectural decisions in a fast-evolving codebase.

Skills

Java

Reactive Programming

Event-driven architecture

Agile mindset

Job description

Principal Java Software Engineer

London (Hybrid – 1–2 days/week onsite)

Join a FinTech Powering the Future of Payments

Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? 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 financial institutions.

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

• 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

• 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

• 20% performance bonus
• Work with cutting-edge tech on globally impactful systems
• Hybrid working – 1–2 days/week in a London office
• Opportunity to collaborate with major global banks
• Fast-paced, product-led environment where your voice matters

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