Senior React & C# Full-Stack Developer | Capital Markets | Front Office Trading | £85,000-£95,000 + Strong Bonus | Hybrid | Belfast, UK

Senior React & C# Full-Stack Developer | Capital Markets | Front Office Trading | £85,000-£95,000 + Strong Bonus | Hybrid | Belfast, UK

A Senior React & C# Full-Stack Developer is needed for a London-based Hedge Fund with operations across energy, commodities, equities, and financial markets. This role will be based in their Belfast office on a hybrid model.

You will play a key role in developing a greenfield front-office trading system, working closely with traders to build high-performance, scalable applications. The company not only develops cutting-edge internal trading platforms but also offers SaaS solutions to external clients, combining fintech innovation with front-office exposure.

Key Responsibilities:

• Develop, design, and deploy React-based front-end applications for high-performance trading systems.
• Build and maintain scalable, event-driven C# .NET backend services.
• Collaborate closely with traders and quantitative teams to optimize UI/UX and system responsiveness.
• Implement best practices in React, TypeScript, and modern front-end architectures.
• Develop and optimize API interactions between the React front-end and C# .NET backend.
• Work in a microservices and cloud-based environment (Azure/AWS) to ensure scalability and resilience.
• Participate in code reviews, CI/CD pipelines, and automated testing to ensure high-quality software delivery.

Tech Stack & Skills:

✅ Front-End: React, TypeScript, Redux, React Query, Next.js (a plus).

✅ Back-End: C# .NET Core, REST APIs, GraphQL, Entity Framework, SQL.

✅ DevOps & Cloud: Azure/AWS, Kubernetes, Docker, CI/CD pipelines.

✅ Trading & Finance: Experience in front-office trading, fintech, or capital markets is a plus.

Why Join?

🚀 Work on cutting-edge trading technology with direct front-office exposure.

💰 Competitive salary (£85,000-£95,000) + strong performance-based bonus.

🏡 Hybrid working model (Belfast-based, flexible office days).

📈 Fast-paced, high-impact role in a dynamic hedge fund environment.