At a Glance
- Tasks: Build high-performance, real-time payment systems using Java and modern tech.
- Company: Leading payments consultancy with a focus on innovation and collaboration.
- Benefits: Competitive salary, annual bonus, hybrid working, and exposure to global banking networks.
- Other info: Join a dynamic team with opportunities for growth in a fast-paced environment.
- Why this job: Make a real impact in the world of finance with cutting-edge technology.
- Qualifications: Strong Java experience and knowledge of asynchronous programming required.
The predicted salary is between 90000 - 115000 £ per year.
Are you a senior/lead hands-on Engineer who thrives in Banking, Financial Services or Payments environments? Do you enjoy building low-latency, high-throughput distributed systems where correctness, resilience, and performance really matter? This is an opportunity to work at the core of real-time payments infrastructure, helping to power instant transactions for some of the world's largest banks. We’re hiring on behalf of a leading payments consultancy delivering mission-critical, event-driven platforms that integrate deeply with bank infrastructure to enable secure, real-time payments at global scale.
What You’ll Be Doing:
- You’ll play a senior individual-contributor role within a high-performing engineering team, building asynchronous, message-driven systems designed for scale, resilience, and near-zero downtime.
- Design and implement high-throughput, low-latency systems processing millions of real-time payment events.
- Build event-driven architectures using modern Java and reactive frameworks.
- Work extensively with non-blocking I/O, asynchronous flows, back-pressure, and concurrency.
- Contribute to system and API design, focusing on scalability, fault tolerance, and observability.
- Collaborate closely with architects, engineers, and client teams across Europe.
- Operate in Agile environments (Scrum / Kanban) with a strong engineering culture.
Tech Stack (current & evolving):
- Java 17+, Spring WebFlux, Akka, MongoDB, Kafka, reactive streams, distributed messaging, cloud-native tooling.
What You Bring:
- Strong hands-on experience with Java 11+ (ideally Java 17) in production environments.
- Deep understanding of asynchronous and reactive programming models.
- Proven experience with event-driven architectures and real-time messaging (Kafka, JMS, Akka, etc.).
- Solid grasp of distributed systems concepts: concurrency, idempotency, fault tolerance, and resilience.
- Experience building and testing production-grade systems using TDD/BDD and CI/CD pipelines.
- Comfortable working on complex, long-lived systems where performance and reliability are critical.
- NoSQL experience, ideally.
Bonus (not essential):
- Experience in banking, payments, or financial systems, or if you’ve built real-time platforms at scale.
What’s In It For You:
- £90,000 – £115,000 base salary (DOE).
- 20% annual bonus.
- Work on event-driven, real-time systems with global impact.
- Hybrid working – 1 day a week onsite (more if you prefer).
- Exposure to major international banks and payment networks.
- A product-led, engineering-first environment where technical decisions are valued.
Payments Engineer - Java in London employer: Fynity
Fynity is an exceptional employer, offering a dynamic work environment in Hemel Hempstead where you can contribute to vital Defence and National Intelligence systems. With a strong focus on employee growth, we provide opportunities for professional development and skill enhancement, all while fostering a collaborative culture that values innovation and teamwork. Join us to be part of a mission-driven team dedicated to tackling real-world threats, with the added advantage of working in a highly secure and supportive setting.
