Principal Java Software Engineer

JR United Kingdom; Basingstoke; Hybrid; GBP 60,000 - 90,000; Full time

Job summary

A leading payments consultancy is looking for a Principal Java Software Engineer in Basingstoke. You will design and develop high-availability systems for real-time transactions, utilizing modern Java technologies and contributing to architectural decisions in an agile environment. This role offers a performance bonus and opportunities to work with major global banks.

Benefits

20% performance bonus

Work with cutting-edge tech

Opportunity to collaborate with major banks

Qualifications

• Strong hands-on experience with Java 11+, ideally Java 17.
• Solid knowledge of Reactive Programming and event-driven architecture.
• Experience with CI/CD and Agile methodologies.

Responsibilities

• Design and build scalable, high-availability systems processing millions of transactions.
• Write clean, testable code using TDD and BDD.
• Collaborate within Agile teams (Kanban/Scrum).

Skills

Java 11+

Reactive Programming

Event-driven architecture

Asynchronous request handling

Agile mindset

Tools

Spring WebFlux

AKKA

Kafka

Job description

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Principal Java Software Engineer, Basingstoke

Client: Fynity

Location: Basingstoke (Hybrid – 1–2 days/week onsite)

Job Category: Other

EU work permit required: Yes

Job Views: 4

Posted: 26.06.2025

Expiry Date: 10.08.2025

Job Description:

Principal Java Software Engineer

We are hiring on behalf of a leading payments consultancy, delivering cutting-edge solutions that enable real-time, secure transactions across the globe. Join a team building asynchronous, event-driven systems using modern Java technologies to power instant payments for major financial institutions.

What You’ll Be Doing

• Design and build scalable, high-availability systems processing millions of 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 (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.

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 London office
• Opportunity to collaborate with major global banks
• Fast-paced, product-led environment where your voice matters

If you're motivated and ready to tackle complex challenges, apply now and help shape the future of payments.