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Design, develop, and maintain responsive, scalable frontend applications using React.js, with a strong focus on performance, accessibility, and usability.Build intuitive, high-quality user interfaces that deliver a seamless and engaging user experience across devices.Develop, maintain, and integrate backend APIs and services using Node.js, Go, or Python.Collaborate closely with Product Managers, UX/UI Designers, and Engineering teams to define, build, and deliver new features and enhancements.Partner with UX designers to ensure implemented solutions accurately reflect the intended user experience, design specifications, and requirements.Ensure reliable and seamless integration between frontend applications, backend services, and third-party systems.Design, build, and maintain microservices and distributed systems using modern cloud-native technologies and compute platforms.Develop and support cloud-based applications and deployments, primarily leveraging AWS services.Contribute to CI/CD pipelines, deployment automation, and engineering best practices to improve development and release processes.Participate in code reviews, automated testing, debugging, and performance optimization to ensure high standards of code quality, reliability, and maintainability.Create and maintain clear technical documentation, including architecture and technical designs, workflows, APIs, and development processes.Troubleshoot production and development issues and work collaboratively with cross-functional teams to identify and implement effective solutions.Continuously evaluate and adopt modern technologies, tools, and engineering practices to improve product quality and development efficiency.

GCS is acting as an Employment Business in relation to this vacancy.

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We are hiring a Senior UI Developer to join a leading banking client working on a greenfield electronic trading platform within their Fixed Income technology team.

This is a hands-on development role building a next-generation eTrading application used by front office traders and sales teams to price, quote, and execute trades in real time.

London (Liverpool Street) | Hybrid (50% office)
💰 Up to £900-1000 per day (Inside IR35)
📅 12-month contract

They're looking for someone with:

Strong React + AG Grid experience building trading UIsSolid Java backend Front office eTrading / Fixed Income or FX backgroundExperience with low-latency systems & RFQ workflows

It's a hands-on build role (not managerial) on a brand-new platform, working closely with a lead developer.

If this sounds of interest, please apply and I'll come back to you with full details.

GCS is acting as an Employment Business in relation to this vacancy.

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