Back End Developer (FS)

Our client, a well-established Financial Services organisation, is seeking a Senior Backend Engineer to join a core platform team responsible for building and operating enterprise-grade backend services that support multiple business-critical systems.

This role sits within a central engineering function and focuses on designing scalable, secure, and high-performance backend platforms in a regulated, data-intensive environment. The successful candidate will play a key role in architecting foundational services and owning them end-to-end in production.

Key Responsibilities

• Design and develop core backend microservices that act as shared infrastructure across multiple internal platforms
• Build and maintain data aggregation services integrating external vendor data, including reference, real-time, and historical datasets
• Design and implement event-driven and real-time data delivery architectures
• Develop and maintain authentication and identity management services, including OAuth2, token lifecycle management, and security controls
• Build and support API gateway capabilities covering routing, authentication, throttling, and traffic management
• Implement platform-level experimentation and feature management to support controlled releases
• Work closely with internal engineering teams to define stable APIs, service contracts, and platform standards

Required Experience

• 5+ years of backend engineering experience in distributed systems
• Strong background in microservices and platform architecture
• Hands-on experience with Kotlin and Spring Boot (or similar JVM frameworks)
• Experience with event-driven architectures, ideally using Apache Kafka
• Strong relational database experience, preferably PostgreSQL
• Experience owning services through the full lifecycle, including deployment and production support
• Ability to make sound architectural decisions in complex, regulated environments

Preferred Background

• Experience building or scaling platform services in Financial Services, including banking, capital markets, trading, or regulated fintech environments
• Exposure to greenfield or platform modernisation initiatives
• Experience with Redis, Kubernetes, and cloud-based infrastructure (AWS preferred)
• Familiarity with NoSQL databases and real-time data delivery mechanisms
• Experience with monitoring, observability, and production-grade support tooling
• Prior exposure to authentication, authorisation, or API management platforms