Principal Java Software Engineer

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

Job summary

A leading payments consultancy seeks a Principal Java Software Engineer to design scalable systems that process millions of real-time transactions. Located in Bolton, you'll work in a hybrid capacity with responsibilities including collaboration within Agile teams and a focus on architectural decisions. Ideal for candidates experienced in high-performance systems within financial tech.

Benefits

20% performance bonus

Hybrid working – 1–2 days/week onsite

Work with cutting-edge tech

Opportunity to collaborate with major global banks

Fast-paced product-led environment

Qualifications

• Experience with Java 11+ and Java 17 preferred.
• Strong knowledge of reactive programming frameworks such as Spring WebFlux.
• Ability to handle complex distributed systems.

Responsibilities

• Design and build high-availability systems for real-time transactions.
• Collaborate within Agile teams to enhance the product development process.
• Contribute to architectural decisions in a fast-evolving environment.

Skills

Java 11+

Reactive Programming

Real-time Messaging Systems

Problem Solving

Agile Methodologies

Job description

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Principal Java Software Engineer, Bolton, Greater Manchester

Client: Fynity

Location: Bolton, Greater Manchester, United Kingdom

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

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

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.