Robert Walters
Principal Java Kotlin Engineer -Fintech Scale Up
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About the Role
Our client is a London-based Fintech scale-up with operations across Europe, Asia, and South America. This role requires candidates to work 2 days per week in the London office.
Job Responsibilities
- Own architecture for critical, scalable cloud-native platforms supporting payments and merchant 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
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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
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Robert Walters Operations Limited is an employment business and employment agency and welcomes applications from all candidates
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