C# developer in equity derivatives

Citi; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Hybrid working model (up to 2 days at‑

27 days annual leave (plus bank hols)

Discretionary annual bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Special discounts for employees

Learning and development resources

Job summary

Citi in London is seeking a highly capable software engineer to help redefine global finance through robust, high-volume applications. You will join a globally distributed development team and contribute to performance testing, debugging, and code optimization.

The role requires deep C# experience across .NET Framework 4.5.2+ and .NET 5+, plus familiarity with REST, OpenAPI, and modern testing frameworks. A proactive, collaborative mindset and strong communication are essential.

Qualifications

• Broad technical capability with specialist knowledge of .NET and C#.
• Strong algorithms, system design/architecture, design patterns and unit testing.
• Experience in large, distributed development teams with high availability systems.

Responsibilities

• Conduct performance testing and profiling to ensure robustness and scalability.
• Troubleshoot, diagnose, and resolve code issues and bottlenecks.
• Identify system enhancements using development procedures and script tools.

Skills

C# proficiency

.NET Framework 4.5.2+

.NET 5+

Performance testing

Unit testing (NUnit/xUnit/Shouldly)

Algorithms & system design

CI/CD (Git/GitLab/GitHub)

Linux

REST/OpenAPI/Swagger

Messaging (Kafka/RabbitMQ)

Python/Java/Bash

Security TLS

Tools

Git

GitLab/GitHub CI/CD

Job description

Описание

Engineer the future of global finance. At Citi, our Tech team doesn't just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match.

Задачи

• Conduct performance testing and profiling to ensure application robustness and scalability suited for high-volume financial data processing.
• Troubleshoot, diagnose, and resolve code issues and performance bottlenecks.
• Utilize knowledge of applications development procedures and concepts, and basic knowledge of other technical areas to identify and define necessary system enhancements, including using script tools and analyzing/interpreting code

Требования

• We are seeking a highly skilled engineer with broad technical capability along with specialist knowledge of .Net Framework and .Net 5+
• You should have good understanding of algorithms, system design/architecture, design patterns, implementation and unit testing.
• A curious and flexible mindset is a must in this role as to are the following qualities, ownership, perseverance, detail orientated and tenacity.
• The ideal candidate will be dependable and resourceful software professional who can comfortably work in a large development team in a globally distributed, dynamic work environment that fosters diversity, teamwork and collaboration.
• Proven experience in a developer role with experience on large & complex projects.
• Strong C# knowledge in addition to exposure to both .Net Framework 4.5.2+ and .Net 5+ Understanding of .Net performance analysis and optimization approaches.
• Write comprehensive unit tests utilizing frameworks like NUnit, xUnit, Shouldly, or equivalents.
• Familiarity with web technologies OpenAI/Swagger, REST, Authentication, TLS.
• Demonstrable experience or familiarity with high volume, low latency, highly available financial systems, trading platforms, or financial data processing.
• Broad technical experience with exposure to different languages such as Python, Java, Bash as well as operating systems such as Linux.
• Where candidate does not have deep exposure, they must show some basic knowledge and willingness to grow.
• Experience with version control & CI/CD tools such as Git & GitLab/GitHub.
• Understanding of one or more messaging technology such Kafka, RabbitMQ, Solace etc.
• Clear understanding various design patterns and leveraging the same to solve complex technical problems.
• Proven ability in working with the development team members and other partners, with minimal supervision.
• Strong verbal and written communications skills, excellent interpersonal skills with ability to communicate well at all levels.
• Team Player, self-starter and thorough who is willing to take on any assigned job/responsibilities.
• Ability to learn new skills quickly with little supervision and ensuring the detail is of high priority.
• Efficiently and effectively manages work, time, and resources.
• Ability to work under high-pressure situations and effectively prioritize in a highly dynamic work environment that includes a global focus.
• Strong analytical and problem solving coupled with program execution skills.
• Ability to understand the big picture - can step back and understand the context of problems before applying analytical skills to address the issues.
• Has the ability to operate with a limited level of direct supervision.
• Can exercise independence of judgement and autonomy.

Условия

• business casual workplace with a hybrid working model (up to 2 days working at home per week)
• competitive base salary (which is annually reviewed)
• 27 days annual leave (plus bank holidays)
• A discretional annual performance related bonus
• Private Medical Care & Life Insurance
• Employee Assistance Program
• Pension Plan
• Paid Parental Leave
• Special discounts for employees, family, and friends
• Access to an array of learning and development resources