Principal Java Software Engineer

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

Job summary

A leading payments consultancy is seeking a Principal Java Software Engineer in Guildford to design high-scale systems for instant payments. Join a fast-paced FinTech environment where you'll contribute to core technology for major financial institutions using Java 17+, Spring, and more, with a hybrid work model in place.

Benefits

20% performance bonus

Hybrid working model

Opportunity to collaborate with global banks

Fast-paced, product-led environment

Qualifications

• Strong hands-on experience with Java 11+ (preferably Java 17).
• Solid knowledge of Reactive Programming (e.g., Spring WebFlux, AKKA).
• Experience with event-driven architecture and real-time messaging systems.

Responsibilities

• Designing and building scalable, high-availability systems for real-time transactions.
• Writing clean, testable code using TDD and BDD.
• Collaborating within Agile teams to contribute to architectural decisions.

Skills

Java

Reactive Programming

Event-driven architecture

Agile mindset

TDD

BDD

CI/CD

Job description

Principal Java Software Engineer

Location: Guildford, United Kingdom (Hybrid – 1–2 days/week onsite)

Client: Fynity

Job Category: Other

EU work permit required: Yes

Job Views: 4

Posted: 26.06.2025

Expiry Date: 10.08.2025

Job Description:

Join a FinTech powering the future of payments. We are seeking an experienced Senior/Principal Java Software Engineer to thrive in a fast-paced, agile environment, passionate about high-throughput, real-time systems. This role involves shaping core technology that powers instant payments for major financial institutions.

We are hiring for a leading payments consultancy that delivers innovative solutions integrating with bank infrastructure for real-time, secure global transactions.

What You’ll Be Doing

• Designing and building scalable, high-availability systems processing millions of real-time transactions
• Working with Java 17+, Spring WebFlux, AKKA, Kafka, and more
• Writing clean, testable code using TDD and BDD
• Contributing to architectural decisions in a dynamic codebase
• Collaborating within Agile teams (Kanban/Scrum)

What You Bring

• Strong hands-on experience with Java 11+ (preferably 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: Experience in Banking/Payments is advantageous but not mandatory—high-performance, real-time systems experience is key.

What’s In It for You

• 20% performance bonus
• Work with cutting-edge technology on globally impactful systems
• Hybrid working model – 1–2 days/week in 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 for challenging, impactful work, apply now and help shape the future of payments.