C# Developer - Equity Derivatives Technology Risk (AVP)

Citigroup; Greater London; Hybrid; GBP 62,000 - 102,000; Full time

Benefits offered by this job

Discretionary annual bonus

Private medical care

Life insurance

Pension plan

Paid parental leave

Special discounts

Learning and development resources

27 days annual leave

Job summary

Citi in London is seeking an AVP-level software engineer to develop and maintain applications for its Equity Derivatives Technology Risk team. The role covers a multi-year transformation across execution, prime, clearing, and cross-product margining.

You will re-engineer the technology estate to boost performance, resilience, and post-trade processes, collaborating with senior engineers and business partners.

Qualifications

• Strong C# knowledge with exposure to .NET Framework 4.5.2+ and .NET 5+.
• Experience on large and complex projects; performance analysis and optimization.
• Ability to write comprehensive unit tests (NUnit, xUnit, Shouldly).
• Familiarity with OpenAPI/Swagger, REST, authentication, TLS.
• Experience with high-volume financial systems or trading platforms.
• Broad tech exposure: Python, Java, Bash; Linux OS.
• Version control and CI/CD: Git, GitHub/GitLab.
• Messaging: Kafka, RabbitMQ, Solace.
• Strong communication and independent working style.

Responsibilities

• Develop and maintain applications for the Equity Derivatives Technology Risk team.
• Lead part of multi-year transformation across equities platform.
• Improve performance, resiliency, and post-trade processes.
• Collaborate with engineers and partners to deliver next-gen equity tech.
• Conduct performance testing and profiling for high-volume data.
• Troubleshoot and resolve code issues and bottlenecks.
• Use tools to identify system enhancements.
• Take on assigned responsibilities as required.

Skills

C# expertise

.NET familiarity

Algorithms and design

Unit testing

Web tech REST

High-volume finance

Python

Java

Bash

Git CI/CD

Kafka

Linux

Design patterns

Tools

Git

GitHub

GitLab

OpenAPI

Swagger

REST

CI/CD

Kafka

RabbitMQ

Solace

Job description

Salary: £62,000 - 102,000 per year

Requirements:

• Strong C# knowledge with exposure to .Net Framework 4.5.2+ and .Net 5+
• Good understanding of algorithms, system design and architecture, design patterns, implementation, and unit testing
• Experience in a developer role on large and complex projects
• Understanding of .Net performance analysis and optimization approaches
• Ability to write comprehensive unit tests using frameworks such as NUnit, xUnit, Shouldly, or equivalents
• Familiarity with web technologies including OpenAPI/Swagger, REST, authentication, and TLS
• Experience or familiarity with high-volume, low-latency, highly available financial systems, trading platforms, or financial data processing
• Broad technical experience with exposure to languages such as Python, Java, and Bash, as well as operating systems such as Linux
• Experience with version control and CI/CD tools such as Git and GitLab/GitHub
• Understanding of messaging technologies such as Kafka, RabbitMQ, or Solace
• Strong understanding of design patterns and how to use them to solve complex technical problems
• Proven ability to work with development team members and other partners with minimal supervision
• Strong verbal and written communication skills and excellent interpersonal skills
• Ability to learn new skills quickly and work with attention to detail
• Strong analytical, problem-solving, and program execution skills
• Ability to manage work, time, and resources efficiently
• Ability to work under pressure and prioritize effectively in a highly dynamic, global environment
• Ability to understand the big picture and apply analytical skills to address issues
• Ability to use applications development procedures and concepts, and basic knowledge of other technical areas to identify and define system enhancements
• Ability to operate with a limited level of direct supervision
• Ability to exercise independence of judgement and autonomy

Responsibilities:

• Develop and maintain applications for our Equity Derivatives Technology Risk team
• Work on our multi-year transformation of the Equities Technology platform across execution, prime, clearing, and cross-product margining
• Re-engineer our technology estate to improve performance, resiliency, and modernized post-trade, clearing, and margin processes
• Collaborate with high-calibre engineers and business and product partners to define and deliver the next generation of Equities technology
• Conduct performance testing and profiling to ensure robustness and scalability for high-volume financial data processing
• Troubleshoot, diagnose, and resolve code issues and performance bottlenecks
• Use script tools and code analysis to identify and define necessary system enhancements
• Take on assigned job responsibilities as required

Technologies:

• .NET Framework
• Bash
• C#
• CI/CD
• Git
• GitHub
• GitLab
• Java
• Kafka
• Linux
• Network
• OpenAPI
• Python
• REST
• RabbitMQ
• Swagger
• Web
• ASP.NET
• AI
• Support

More:

We are Citi, and our Tech team is helping to redefine global finance at scale, with systems processing $5 trillion across our network and operating in more than 180 countries. Our Equities Technology team is undertaking a bold, multi-year transformation to build a best-in-class global platform across execution, prime, clearing, and cross-product margining. We are re-engineering our technology estate to deliver world-leading performance, resiliency, advanced execution, global market connectivity, and modernised post-trade, clearing, and margin processes. In this full-time AVP role based in London, we offer a business casual workplace with a hybrid working model of up to 2 days working from home per week, competitive base salary with annual review, 27 days annual leave plus bank holidays, discretionary annual performance bonus, private medical care and life insurance, employee assistance program, pension plan, paid parental leave, special discounts, and access to learning and development resources. We are committed to a diverse, inclusive workplace where everyone feels comfortable coming to work as their whole self and can thrive.

last updated 36 week of 2026