Contract - Software Developer - ReactJs

Build the UI that powers real-time trading decisions.
We're looking for a hands-on Senior UI Developer to build fast, intuitive, AI-enabled trading technology for a global derivatives platform used by fast-moving business users.
You'll work close to product, UX, architecture, engineering, quants, and traders to turn complex workflows, real-time data, and business-critical requirements into clean, scalable front-end solutions.
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What You'll Do
Build Trading-Grade UI
• Build high-performance React, TypeScript, and JavaScript applications.
• Create intuitive, accessible interfaces for complex trading workflows.
• Develop reusable components, patterns, and front-end standards.
• Integrate with REST APIs, WebSockets, backend services, and Kafka event streams.
• Support secure authentication and SSO, OIDC flow.
Engineer for Quality
• Write clean, scalable, testable code.
• Improve performance, reliability, accessibility, and user experience.
• Contribute to technical design, code reviews, testing, deployment, and documentation.
• Apply CI/CD, DevOps, secure coding, automated testing, and enterprise quality standards.
• Use AI-assisted development tools responsibly to speed up delivery without lowering engineering rigour.
Work Close to the Business
• Work with product, UX, business, architecture, and engineering teams.
• Break down ambiguous requirements into estimable tasks, provide realistic timelines, and communicate progress clearly to technical and business stakeholders.
• Turn ambiguous requirements into practical technical solutions.
• Support releases, troubleshooting, and continuous improvement.
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What You'll Bring
Core Engineering Skills
• 12+ years building enterprise web applications.
• Expert React, TypeScript, modern JavaScript, HTML, CSS, and responsive design.
• Strong front-end architecture, component design, state management, performance optimisation, and automated testing.
• Hands-on experience with GitHub Actions (or equivalent), build pipelines, and basic Kubernetes concepts for deploying and troubleshooting front-end services in enterprise environments.
• Comfortable using application logs, browser devtools, distributed tracing (e.g. OpenTelemetry, Application Insights), and structured error reporting to diagnose issues in production-like environments.
Trading Platform Experience
• Experience building real-time, data-heavy UIs using WebSockets, streaming APIs, Kafka, or event-driven messaging.
• Strong API integration, microservices, and secure authentication experience.
• Financial services, commodities, energy trading, or front-office technology experience is highly desirable.
• Experience consuming or debugging real-time data flows via Kafka or Redpanda, including reading message headers, correlating events across services, and validating stream behaviour during integration and UAT.
AI-Assisted Development
• Confident using GitHub Copilot, Microsoft Copilot, Azure AI services, or equivalent tools.
• Able to use AI for coding, testing, debugging, refactoring, documentation, and pull request preparation.
• Reviews AI-generated output with the same standards for security, privacy, quality, and maintainability as any other code.
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Useful Extras
• Angular, Vue.js, Node.js, C#, SQL, GraphQL, CSS3 / SCSS, Tailwind, Bootstrap, Material UI, or AG Grid.
• Databricks dashboards, Plotly, data visualisation, analytics dashboards, or similar reporting and insight tools.
• Understanding of .NET thick-client technologies and practical approaches for converting legacy desktop applications into modern web applications.
• Playwright, Cypress, Jest, Storybook, visual regression testing, or micro-frontends.
• Pipeline authoring, PR checks, automated test gates, and deployment workflows.
• Kubernetes - Pods, services, ingress, config maps, and basic kubectl troubleshooting
• Advanced AI-assisted development workfl