Principal Java Software Engineer

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

Job summary

Une société de conseil en technologies de paiement recherche un Principal Java Software Engineer pour rejoindre une équipe dynamique en charge de la création de systèmes réactifs et événementiels. Ce rôle offre l'opportunité de travailler avec des technologies de pointe, d'influencer les décisions architecturales et de collaborer avec des banques mondiales sur des projets à fort impact. Un bonus de performance de 20% est proposé, et un mode de travail hybride est alors mis en place.

Benefits

20% performance bonus

Travail avec des technologies de pointe

Collaboration avec des banques mondiales

Environnement rapide et axé sur le produit

Qualifications

• Expérience solide avec Java 11+, idéalement Java 17.
• Connaissance des systèmes réactifs comme Spring WebFlux.
• Expérience avec l'architecture événementielle et les systèmes de messagerie en temps réel.

Responsibilities

• Conception et construction de systèmes évolutifs pour traiter des millions de transactions en temps réel.
• Collaboration dans des équipes Agiles utilisant Kanban/Scrum.

Skills

Java

Reactive Programming

Real-time Messaging Systems

Agile Mindset

Job description

Social network you want to login/join with:

Principal Java Software Engineer, southampton

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Client:

Fynity

Location:

southampton, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

4

Posted:

26.06.2025

Expiry Date:

10.08.2025

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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.