Senior Full Stack Developer – React, JavaScript & C# .NET

About the role

We are looking for a Senior Full Stack Developer to join our dynamic team in London. You will work on cloud‑native, scalable applications for the financial sector, using React and C# .NET Core. The role is hybrid, with three days a week onsite.

Key responsibilities

• Design, develop and maintain full‑stack applications using React.js and C# .NET Core.
• Build high‑performance backend services and RESTful APIs with a focus on scalability.
• Create responsive, modular UI components with modern JavaScript/TypeScript patterns.
• Collaborate with business stakeholders in risk, regulatory reporting and finance.
• Develop Power BI dashboards and analytical reports.
• Work with DevSecOps to optimise CI/CD pipelines and automated testing.
• Contribute to event‑driven and distributed system designs using technologies such as Kafka or Event Hub.
• Mentor junior developers and foster a collaborative agile environment.

Required profile

• Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK and modern UI patterns.
• Expertise in C# .NET Core, REST APIs and microservices architecture.
• Experience building solutions for the financial services sector.
• Solid understanding of cloud platforms (Azure preferred, AWS acceptable).
• Familiarity with CI/CD tools such as Azure DevOps, GitLab or GitHub Actions.
• Good knowledge of relational databases (SQL Server, PostgreSQL).

Required skills

• React.js
• JavaScript
• TypeScript
• Redux / RTK
• C#
• .NET Core
• REST APIs
• Microservices
• Python
• PySpark
• Power BI
• Azure DevOps
• GitLab
• GitHub Actions
• Azure
• AWS
• SQL Server
• PostgreSQL
• Kafka
• Event Hub
• CI/CD

What we offer

• Innovative projects that impact the financial sector.
• Collaboration with a talented, cross‑functional team.
• Competitive daily rate of £650 (inside IR35).
• Flexible hybrid working arrangement (3 days onsite).
• 12‑month contract with potential for extension.