Senior Java Software Engineer

Fynity; Greater London; Hybrid; GBP 95,000 - 115,000; Full time

Job description

This range is provided by Fynity. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

Direct message the job poster from Fynity

Practice Lead @ Fynity | Building Architecture and Product teams for leading orgs across the UK & Europe

Senior Java Software Engineer – Real-Time Systems | £95k - £115k + 20% Bonus

Are you a highly experienced Java Software Engineer looking to take on a senior hands-on role while mentoring the next generation of top talent? Do you want to work on high-performance, real-time systems that process millions of transactions in milliseconds?

This is your opportunity to join a leading payments technology consultancy, working with some of the world’s largest financial institutions to redefine the future of real-time payments.

This company is setting the bar high, so rest assured, you will be working alongside some of the industry’s most talented Developers and Engineers.

The Role

As a Senior Software Engineer, you’ll be at the forefront of building asynchronous, event-driven systems using Java 17+, Spring WebFlux, AKKA, Kafka, and more. You’ll be working fully hands-on in a high-volume, low-latency environment, contributing to architecture and design, while also mentoring and guiding other engineers to raise the technical bar across the team.

• Design and develop high-performance, scalable applications for real-time payments.
• Lead technical discussions and drive best practices in TDD & BDD methodologies.
• Optimise applications for high availability, resilience, and scalability.
• Mentor and support mid-level and junior engineers, fostering a collaborative engineering culture.
• Work in a highly agile Kanban/Scrum environment, contributing to continuous improvement.

What We’re Looking For:

• Expert-level experience in Java 11+ (ideally Java 17) and Reactive Programming (Spring WebFlux, AKKA).
• Strong knowledge of asynchronous request handling and distributed systems.
• Proven experience with event-driven architectures and real-time messaging (Kafka, JMS).
• A strong advocate for Agile methodologies (TDD, BDD) and CI/CD best practices.
• Mentorship experience, helping to upskill and guide engineers within the team.
• Experience building high-performance, mission-critical systems (Payments, Banking, or any real-time transactional systems).
• Excellent soft skills, you’ll be working in a collaborative team with stakeholders from across the business.

Not from a Banking/Payments background? If you’ve worked on complex real-time systems in other industries, we still want to hear from you!

What’s in It for You?

• £95k - £115k salary (depending on experience)
• 20% bonus (based on both company and personal performance)
• Work with cutting-edge technology in a high-impact role
• Shape the future of payments at a global scale
• Flexible hybrid working (London office, 1-2 days per week)

Ready to Take a senior role in a High-Performance Engineering Team?

If you're a senior engineer who wants to stay hands-on while mentoring others, this is your chance to work on mission-critical financial systems and drive real innovation.

Apply now and be part of the next evolution in real-time payments technology!

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering, Information Technology, and Other

Industries

• IT Services and IT Consulting, Software Development, and Computer and Network Security