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 includingcross-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 toolsfor 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.
*We cannot offer sponsorship for this role*
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Senior Full Stack (Java/Kotlin/React/TS) Engineer employer: JUXT
At JUXT, we pride ourselves on being an excellent employer by fostering a culture of innovation and collaboration. Our London-based teams enjoy the autonomy to make impactful technical decisions while working on exciting greenfield projects for top financial institutions. With a strong focus on employee growth and development, we offer opportunities for continuous learning and career advancement in a supportive environment.
