Senior Software Engineer - Java Engineer (Remote)

Senior Java Engineers (12x) — Contract - (Financial Services / Investment Management) Location: Remote First Engagement Type: Contract Day Rate: £600 - £700 Per Day (Monthly Pay) Our client is a leading UK investment management platform currently undertaking a major back-office transformation programme. The programme centres on the integration of a third-party institutional custody and clearing platform, replacing legacy back-office infrastructure with a modern, cloud-native architecture built to handle high-throughput financial operations across settlement, custody, corporate actions processing, and reconciliation. We are seeking multiple Senior Java Engineers to join the programme engineering team. You will be responsible for designing and delivering robust, high-performance Java services that integrate with both the incoming custody platform and existing internal systems. You will work within cross-functional agile squads and are expected to contribute from day one with minimal ramp-up. Design, develop, and deliver high-quality Java microservices in support of back-office platform integration Build and maintain RESTful and event-driven APIs supporting settlement, reconciliation, corporate actions, and custody workflows Integrate with third-party financial platform APIs and messaging systems Write clean, well-tested, production-grade code with appropriate unit, integration, and contract testing coverage Identify and resolve performance, reliability, and scalability issues Work closely with business analysts and platform specialists to understand domain requirements and translate them into technical implementations Support DevOps practices including CI/CD pipeline maintenance, deployment automation, and cloud infrastructure management Strong, demonstrable experience as a Senior Java Engineer in a production environment Proficiency in Java 11+ with Spring Boot, Spring Cloud, and associated ecosystem tooling Hands-on experience with AWS (minimum two of: ECS, Lambda, SQS/SNS, RDS/Aurora, S3, API Gateway, CloudWatch) Strong unit and integration testing discipline (JUnit, Mockito, contract testing) Experience working in agile delivery environments within complex, multi-team programmes