Senior C# Developer - Equity Derivatives Tech Risk (Hybrid)

Citi Group; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Job summary

Citi Group is seeking a skilled C# Developer for Equity Derivatives Technology Risk in London. You will engineer scalable .NET solutions, participate in a global team, and contribute to performance, reliability and security for a fast‑moving financial platform.

Join a collaborative environment with mentorship, learning opportunities, and potential hybrid work arrangements to balance delivery and growth.

Qualifications

• Proven experience as a software engineer in C#/.NET with 4.5.2+ and 5+.
• Strong knowledge of algorithms, system design and patterns.
• Experience with unit testing frameworks and high‑volume systems.

Responsibilities

• Develop and maintain scalable C#/.NET services for equities trading
• Collaborate with global teams in a distributed environment
• Profile, optimize, and troubleshoot performance bottlenecks

Skills

C#

.NET Framework

.NET 5+

Performance optimization

Unit testing

REST / TLS

High-volume finance systems

Python / Java / Bash

Git / GitLab / GitHub

Messaging systems (Kafka, RabbitMQ, S•

Tools

NUnit

xUnit

Shouldly

OpenAPI / Swagger

Docker

Kubernetes

Job description

Citi Group is seeking a skilled C# Developer for Equity Derivatives Technology Risk in London. You will engineer scalable .NET solutions, participate in a global team, and contribute to performance, reliability and security for a fast‑moving financial platform.

Join a collaborative environment with mentorship, learning opportunities, and potential hybrid work arrangements to balance delivery and growth.