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# Senior Software Engineer, Java

- **Company:** FDJ UNITED
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Cloud Computing, Data Infrastructure, Software Engineering, Data Streaming, Event Driven Architecture, Apache Flink, Apache Kafka, Spark Streaming, Video Streaming
- **Published:** September 7, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/senior-software-engineer-java/46388661

## About the Role

systems, including trader-facing tools.Your experience5+ years software engineering experience in building distributed systems.Excellent Java skillsExperience with streaming technologies (Apache Flink preferred; Kafka Streams, Spark Streaming, etc.).Solid understanding of event-driven architecture and asynchronous processing patterns.Experience handling data consistency challenges such as at-least-once processing, idempotency, and event ordering.Experience building high-throughput, low-latency systems in production environments.Ability to model complex domain logic and translate business requirements into robust technical solutions.Experience in cloud computing, ideally AWS.Proactive and ability to deal with and account for uncertainty, with the flexibility to learn by iteration.Nice to HaveExperience in sports betting, trading platforms, or financial systems.Experience building real-time alerting or monitoring systems.Exposure to modern data platforms or lakehouse architectures.We
believe talent knows no boundaries. Our hiring process focuses solely on your skills, experience, and potential to contribute to our team. We welcome applicants from all backgrounds and evaluate each candidate based on merit, regardless of personal characteristics as the age, gender, origin, religion, sexual orientation, neurodiversity or disability. #J-18808-Ljbffr

## Description

for a Senior Software Engineer to help build and evolve our next-generation trading risk platform, powering real-time liability and exposure management across multiple brands and markets.You'll primarily work on our Core Liability engine - a modular, event-driven system - delivering fast, accurate, and real-time insight into live positions and risk. This platform underpins critical trading decisions and represents a major step forward in scalability, resilience, and streaming architecture across our technology estate.What You'll DoDesign and build distributed, real-time streaming components within a Flink-based architecture.Develop and maintain services that process the full bet lifecycle, from acceptance through settlement, cancellation, and cashout.Implement complex financial calculations, including multi-bet and bet-builder logic, ensuring accuracy and consistency at scale.Build systems that aggregate exposure and generate real-time risk insights across outcomes, markets, and, customers.Contribute to a granular alerting framework that detects and publishes meaningful changes in liability.Ensure correctness in a high-throughput environment through robust handling of ordering, duplication, and idempotency.Optimise streaming jobs for latency, throughput, and resource efficiency.Collaborate closely with trading and product teams to translate domain requirements into scalable, reliable systems.Contribute to a modular architecture where components evolve independently and scale with increasing demand.What You'll Work OnA real-time liability platform providing live visibility into exposure and risk across brands and jurisdictions.A Flink-based streaming ecosystem composed of specialised components for ingestion, enrichment, calculation, aggregation, and alerting.Event-driven systems that process high volumes of bet events with strong consistency guarantees.Outcome-level alerting that enable faster and more informed trading decisions.Integration with downstream


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