Senior Java Engineer We are seeking an experienced and opinionated Principal Java Engineer to join our high-performing engineering team, working on low latency, high-throughput systems in the payments processing domain. This hybrid role is based in the UK and offers the opportunity to build scalable, real-time services using contemporary technologies. If you're passionate about performance, have strong Core Java and Spring Boot expertise, and thrive in a collaborative yet opinionated engineering culture, we want to hear from you. Key Responsibilities Design, develop, and optimize low-latency, high-throughput backend systems using Java. Build and maintain RESTful APIs and microservices that power secure