Principal Backend Engineer - Fintech Payment Scale UP

Our client is a London based Fintech scale up with operations across Europe, Asia and South Americas. This role requires candidates to work 2 day per week in London office. Job Responsibilities:

• Own architecture for critical, scalable cloud-native platforms supporting payments experiences
• Build secure, resilient, compliant services for high-volume transaction processing
• Drive modern backend practices using Java 17/21, Spring Boot 3, Kotlin, and clean architecture
• Design event-driven architecture with Kafka across scalable, decoupled domains
• Define standards for API-first development, REST/gRPC, and domain-driven design (DDD)
• Set standards for availability, performance, fault tolerance, and observability
• Translate business priorities into scalable technical strategy with Product, Data, and leadership
• Lead cross-functional technical initiatives supporting growth and market expansion Job Requirement:
• 10+ years building and operating distributed, production-grade backend systems
• Senior Staff or Principal experience driving architecture across teams or domains
• Deep expertise in Java (17+), Spring Boot, and modern backend engineering
• Strong experience with microservices, event-driven architecture, and asynchronous systems
• Experience with high throughput, low latency, reliability, ideally in fintech or transaction-heavy environments
• Strong system design, data structures, and performance trade-offs knowledge
• Production experience with AWS, Docker, and Kubernetes
• Experience with observability, resilience patterns, and CI/CD
• Strong stakeholder communication, influence, and senior engineering mentorship

Robert Walters Operations Limited is an employment business and employment agency and welcomes applications from all candidates