Full Stack Engineer C#?Backend?/?React?.NET Front End - Lorien Impellam

Full Stack Engineer (C# / .NET & React) - Investment Banking

London (Hybrid) | 6-Month Contract | Investment Bank

We are working with a leading global investment bank to hire a hands-on Full Stack Engineer to help build a brand-new, high-impact web application from the ground up.

This is a unique opportunity to take ownership of a greenfield project delivering a real-time web portal for institutional bond issuers and sales teams-providing live market insights and new issuance updates.

The Role

You will play a critical role in designing, developing, and deploying a full-stack web application , taking it from concept through to production.

This role requires someone who can hit the ground running , build the entire development pipeline , and take ownership across the full software lifecycle-not just individual development tasks.

Key Responsibilities

Back-End Development

• Design and build RESTful APIs using ASP.NET Core (6+)
• Develop clean, scalable, and testable C# code
• Manage data access using EF Core, Dapper, or similar
• Implement secure authentication (e.g. Azure AD, JWT )

Front-End Development

• Build modern, responsive UIs using React (18+) and TypeScript
• Integrate components into existing web applications (Angular or similar)
• Apply best practices for performance, accessibility (WCAG 2.1 AA), and UX
• Contribute to development of secure, client-facing portals

Build, CI/CD & Deployment

• Design and implement CI/CD pipelines (Bitbucket, TeamCity or similar)
• Create build processes using MSBuild, npm/yarn, Webpack
• Configure automated unit, integration, and UI testing
• Manage deployments across staging and production environments

Collaboration & Ownership

• Contribute to architectural decisions and code reviews
• Document APIs (Swagger/OpenAPI), deployments, and runbooks
• Mentor junior engineers and promote engineering best practices

What We're Looking For

• Strong experience in C# / .NET and React development
• Proven track record building external client-facing applications or portals
• Experience delivering end-to-end solutions-from development to production
• Strong knowledge of CI/CD pipelines, build automation, and deployments
• Comfortable working in a greenfield environment with high ownership
• A self-starter mindset with the ability to drive delivery independently

Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.