Fynity
Senior Java Software Engineer
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Senior Java Engineer – Payments
London – Hybrid (1 day per week onsite)
Are you a hands-on Java Engineer who enjoys building high-performance, distributed systems where resilience, scalability and correctness really matter?
This is an opportunity to work at the heart of real-time payments infrastructure, helping to deliver mission-critical platforms used by some of the world's largest financial institutions. We're hiring on behalf of a leading payments consultancy that designs and delivers event-driven payment platforms for Tier 1 banks across the UK and internationally.
You'll join a highly skilled engineering team responsible for building and enhancing low-latency, event-driven payment systems capable of processing millions of transactions every day. Working as a senior individual contributor, you'll collaborate with architects, engineers and client teams to design and deliver robust, scalable software that powers real-time payment processing.
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Responsibilities
- Design and develop high-performance Java applications for real-time payment processing.
- Build scalable, event-driven microservices using modern Java technologies.
- Develop asynchronous, message-driven systems with a strong focus on resilience and performance.
- Design clean, maintainable APIs and distributed system architectures.
- Work closely with architects, product teams and client stakeholders to deliver complex technical solutions.
- Contribute to technical design discussions, code reviews and engineering best practices.
- Operate within Agile (Scrum/Kanban) delivery teams.
What We're Looking For
You'll be someone who enjoys solving complex engineering problems and building highly resilient distributed systems.
We're particularly interested in engineers with:
- Strong commercial experience developing applications with Java 11+ (ideally Java 17+).
- Experience building scalable Spring Boot microservices.
- Strong experience/understanding of payments.
- Commercial experience with event-driven architectures and messaging technologies such as Kafka, JMS or Akka.
- Experience with TDD/BDD and modern CI/CD practices.
- Experience working with NoSQL databases, ideally MongoDB.
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What's On Offer
- £90,000 - £115,000 basic salary (DOE)
- 20% annual bonus
- Hybrid working (1 day per week in London)
- Opportunity to work on business-critical payment platforms used globally.
- Exposure to Tier 1 banking clients and large-scale payment networks.
- Engineering-led culture where technical excellence and innovation are genuinely valued.
- Excellent long-term career progression within a growing payments consultancy.
If you're passionate about building resilient, high-performance Java applications and want to work on technology that underpins real-time payments at global scale, we'd love to hear from you. Apply today to find out more.
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