Senior Full Stack (Java/Kotlin/React/TS) Engineer
JUXT · London, England ·
Senior Full Stack Engineer - Java/Kotlin&React We are partnering with a Tier 1 investment bank on a major, multi-year transformation of its Prime Finance Equities platform . The Equity Accelerator programme is re-engineering core trading and post-trade systems, replacing legacy architecture with modern event-driven, cloud-native technology and delivering advanced capabilities including cross-margining and credit financing .
This is a genuine engineering role working on live, financially critical systems - not a greenfield project or generic Java delivery. What you'll be doing Build Java/Kotlin event-driven services and modern React/TypeScript applications Modernise complex legacy trading and post-trade systems Design for failure handling, ordering, replay and data integrity Apply TDD across unit, integration and E2E testing Work with Kafka, Solace, TIBCO EMS, SQL Server&MongoDB Build and deploy using Docker, Kubernetes/OpenShift&CI/CD Work with OpenTelemetry, ELK&Grafana Use AI-assisted/agentic coding tools for legacy analysis, testing and refactoring Kotlin experience or willingness to learn Event-driven / message-passing / event-sourcing experience Redux, WebSockets and API integration Genuine hands-on TDD experience Background in capital markets, trading or post-trade Experience with iterative delivery, trunk-based development and CI/CD Senior-level autonomy and strong architectural instincts Prime Brokerage, Synthetic/Swap or Cash Equities experience, plus exposure to Corporate Actions, 871(m), EMIR, MiFID, Kafka, SQL Server, Kubernetes/OpenShift or cloud-native platforms.
If you're a senior full-stack engineer looking to work on complex financial technology with real business impact, I'd be keen to speak. *We cannot offer sponsorship for this role*