Senior Java Engineer - FinTech Real-Time Payments (Hybrid)

X4 Technology is seeking a Senior Software Engineer to join a market‑leading fintech platform in London. You will work on real‑time payment infrastructure, integrating scalable, resilient Java applications within a collaborative product engineering team.

You’ll contribute to architectural decisions, build high‑quality reusable code, and help shape future capabilities while embracing CI/CD, Agile delivery, and cutting‑edge tech such as Kafka, Spring, and distributed systems.