Senior C#/.NET Engineer - Front Office Liquidity & Risk

MARGO; Greater London; On-site; GBP 120,000 - 170,000; Full time

Job summary

MARGO in London seeks a passionate Senior C# / .NET Developer to design, modernize, and scale core front-office calculation engines. This 100% hands-on role focuses on building high-performance back-end services for liquidity and treasury systems, with real-time data flows and microservices architecture.

You will work without translation layers, contribute to CI/CD pipelines, and apply modern .NET tooling in a demanding banking environment.

Qualifications

• Proven experience as a Senior C# .NET Developer in demanding, performance-sensitive banking environments.
• Deep understanding of Object-Oriented design patterns, asynchronous programming, and multithreading.
• Solid back-end experience building event-driven services, messaging systems, and Windows Services.
• Strong MS SQL Server database expertise and experience with lightweight ORMs (Dapper).
• Practical familiarity with enterprise DevOps pipelines and AI developer tools (Copilot/Claude).
• A dedicated individual contributor mindset committed to daily hands-on coding.

Responsibilities

• Design, build, and optimize high-performance back-end calculation engines using modern C# .NET.
• Develop asynchronous, message-driven microservices and Windows Services for distributed processing.
• Build and tune database objects and data access layers with MS SQL Server and Dapper.
• Implement real-time feeds and RESTful APIs using ASP.NET Web API and SignalR.
• Leverage AI tools to accelerate testing, refactoring, and delivery.

Skills

Senior-level experience

C# .NET

Asynchronous programming

Multithreading

Object-oriented design

Windows Services

MS SQL Server

Dapper

ASP.NET Web API

SignalR

SOA / Event-driven

CI/CD tooling

DevOps pipelines

AI tools (Copilot/Claude)

Tools

Dapper

MS SQL Server

ASP.NET Web API

SignalR

Rebus

Git

TeamCity

Jenkins

Ansible

Job description

MARGO in London seeks a passionate Senior C# / .NET Developer to design, modernize, and scale core front-office calculation engines. This 100% hands-on role focuses on building high-performance back-end services for liquidity and treasury systems, with real-time data flows and microservices architecture.

You will work without translation layers, contribute to CI/CD pipelines, and apply modern .NET tooling in a demanding banking environment.