Social network you want to login/join with: Interested in this role You can find all the relevant information in the description below. Principal Java Software Engineer, london col-narrow-left Client: Fynity Location: london, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 1 Posted: 23.05.2025 Expiry Date: 07.07.2025 col-wide 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 You’ll join 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 ? 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. #J-18808-Ljbffr