Senior Full Stack (Java/Kotlin/React/TS) Engineer

🚀Senior Full Stack Engineer – Java/Kotlin&React

📍London | Hybrid

🏦Tier 1 Investment Bank | Prime Finance

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
• Develop real-time user experiences using WebSockets
• 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

🎯 We're looking for

• Strong Java/JVM engineering experience
• Kotlin experience or willingness to learn
• Strong React + TypeScript production experience
• 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

⭐ Desirable

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*