Technical Architect (.Net / C# )

.NET / C# Architect – Capital Markets | Inside IR35 | Hybrid (3 Days in London) A leading financial institution is seeking a highly experienced .NET Architect to drive the technical design and implementation of a next-generation Treasury platform. This is a key role responsible for shaping system architecture, guiding development teams, and ensuring the scalability, robustness, and performance of mission-critical trading and treasury systems. Key Requirements: INSIDE IR35 Hybrid working: 3 days onsite in London Must have Capital Markets or Treasury experience Responsibilities: Define and lead the end-to-end architecture for the Treasury platform using modern .NET technologies and distributed systems design. Collaborate with business stakeholders, product owners, and senior developers to translate business needs into scalable, high-performance technical solutions. Promote engineering best practices, including design patterns, microservices, security, performance optimization, and cloud deployment. Lead the design and delivery of integrations with upstream and downstream systems such as Order Management Systems (OMS), Execution Management Systems (EMS), pricing engines, and compliance modules. Conduct architecture and code reviews, ensuring alignment with enterprise standards and industry best practices. Mentor development teams and help drive delivery within an Agile framework. Essential Skills & Experience: Proven background in .NET architecture roles within capital markets, investment banking, or other financial services environments. Deep expertise in C#/.NET Framework and .NET Core, including microservices, multithreaded programming, and real-time distributed systems. Strong understanding of treasury operations, fixed income, FX, and derivatives workflows. Solid experience with SQL Server, messaging systems (e.g., RabbitMQ, Service Bus), and API development (REST, FIX). Experience in cloud-native architecture, ideally with Microsoft Azure (Functions, Logic Apps, Cosmos DB, Blob Storage, Service Bus). Familiarity with Order Management Systems such as ThinkFolio, Aladdin, Portware, or Fidessa. Knowledge of implementing regulatory and compliance frameworks (e.g., MiFID II, UMR, BCBS). Excellent communication skills with the ability to engage both technical teams and business users. Exposure to DevOps practices including CI/CD pipelines and Infrastructure as Code (IaC). Experience modernizing legacy trading platforms or delivering greenfield systems within capital markets.