C# / .NET Developer – Front Office Liquidity, Treasury & Risk Systems

November 5, 2026

Senior

London, United Kingdom

Indeed

Description

A tech-native consultancy is hiring a Senior C# / .NET Developer for the Front Office and Treasury IT environment of a Tier-1 investment bank in London. The seat is 100% hands-on individual contribution: building, modernizing and scaling real-time calculation engines for Liquidity Risk, Treasury ALM, XVA and financial resource management. The team is migrating toward an event-driven microservices architecture while supporting interactive UI tools used daily by several hundred users.

Responsibilities

Design, build and optimize high-performance back-end calculation engines using modern C# .NET
Develop asynchronous, message-driven microservices using Rebus and Windows Services for distributed processing
Build and tune database objects, complex queries and data access layers using MS SQL Server and Dapper
Implement real-time communication feeds and RESTful APIs using ASP.NET Web API and SignalR
Leverage LLMs and practical agentic AI workflows (Copilot, Claude) in daily engineering
Implement liquidity risk and treasury calculation logic: cash-flow time-bucketing, NSFR, RNFB, LCR or liquidity buffers
Implement cash forecasting: forward cash projections and contractual vs. behavioral maturities
Implement balance sheet and capital metrics: leverage exposure and financial resource utilization
Implement XVA and pricing adjustments: CVA, FVA, ColVA and funding costs
Implement risks and Greeks: non-linear sensitivities (Delta, Gamma, Vega) and PnL Explain
Implement pre-trade analytics: trade simulation, margin and funding impact checks, and booking workflows
Deliver clean, testable and maintainable code adhering to SOLID principles and design patterns
Participate in automated CI/CD pipelines using Git (Bitbucket), TeamCity, Jenkins or Ansible
Maintain high standards of ownership, transparency and operational risk mitigation

Requirements

Proven experience as a Senior C# .NET Developer in 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 expertise and experience with lightweight ORMs (Dapper)
Practical familiarity with enterprise DevOps pipelines and AI developer tools (Copilot/Claude)
Dedicated individual contributor mindset committed to daily hands-on coding
Front-end web development with React, Redux, TypeScript and HTML (valued)

Conditions

Permanent role with contracting opportunities also available
Access to multi-asset Front Office, Trading and Electronic Trading environments
Highly technical and challenging engineering assignments
Strong emphasis on skill development and long-term career progression
Human-sized consultancy with close support and high-quality missions
Platform operates in direct proximity to trading desks, Treasury and risk managers