Senior Full-Stack Engineer: Java/Kotlin & Event-Driven

JUXT; Greater London; On-site; GBP 100,000 - 150,000; Full time

Job summary

JUXT is seeking a Senior Full Stack Engineer to join a Tier 1 investment bank transformation. You will build Java/Kotlin event-driven services and React/TypeScript applications that power live, financially critical systems.

You’ll modernise legacy trading and post-trade platforms, design for failure, data integrity and replay, and work across Kafka, Kubernetes, CI/CD and cloud-native stacks. Strong architectural instincts and senior autonomy are expected.

Qualifications

• Experience building Java/Kotlin event-driven services in production environments.
• Strong React/TypeScript UI development experience.
• Hands-on with Kafka-based messaging and data streaming.
• Cloud-native architectures using Docker/Kubernetes and CI/CD pipelines.
• Proficient in TDD and automated test strategies.
• Background in capital markets, trading or post-trade systems.

Responsibilities

• Build Java/Kotlin event-driven services and modern React/TypeScript applications.
• Modernise legacy trading and post-trade systems.
• Design for failure handling, ordering, replay and data integrity.
• Apply TDD across unit, integration and E2E tests.
• Work with Kafka, Solace, TIBCO EMS, SQL Server, MongoDB.
• Build and deploy using Docker, Kubernetes/OpenShift & CI/CD.
• Leverage OpenTelemetry, ELK and Grafana for observability.
• Explore AI-assisted coding tools for legacy analysis and refactoring.
• Demonstrate senior autonomy with strong architectural instincts.

Skills

Java/Kotlin event-driven

React/TypeScript

Kafka

SQL Server

MongoDB

Docker

Kubernetes/OpenShift

CI/CD

TDD

OpenTelemetry

ELK

Grafana

Redux

WebSockets

API integration

Capital markets

Event-sourcing

Trunk-based development

Job description

JUXT is seeking a Senior Full Stack Engineer to join a Tier 1 investment bank transformation. You will build Java/Kotlin event-driven services and React/TypeScript applications that power live, financially critical systems.

You’ll modernise legacy trading and post-trade platforms, design for failure, data integrity and replay, and work across Kafka, Kubernetes, CI/CD and cloud-native stacks. Strong architectural instincts and senior autonomy are expected.