C# Developer (Contract) – Investment Bank - Mid-Level / AVP
Location: London (4 days in office)
Contract: 6 Months
Rate: £600–£800 per day
Team: EMEA Markets Engineering
We are supporting a leading global investment bank in their search for a mid-level C# Developer (Contract) to join the EMEA Markets Engineering team. This is a hands-on role focused on maintaining and enhancing existing front-office systems used by traders and quants.
You will work on high-impact systems that directly influence trading and risk decisions, taking responsibility for development and ensuring their ongoing reliability.
The Role
You will take ownership of existing pricing and risk systems, contributing more on the development side than operations, while understanding how these systems are managed in production the role includes:
* Maintaining and enhancing front-office pricing and risk systems built in C#
* Collaborating with quantitative analysts and traders to understand requirements and deliver effective solutions
* Troubleshooting and resolving production issues, ensuring smooth system operation
* Working with grid and cloud-based platforms to support compute-intensive tasks
* Supporting out-of-hours critical system coverage on a rota
This is a mid-level role you will be responsible for existing systems and their ongoing maintenance, rather than leading large greenfield projects.
Essential Experience:
* 4–7+ years of experience in quantitative development or technical roles supporting trading/risk systems
* Hands-on development experience with C#
* Understanding of derivatives, pricing, and risk concepts
* Exposure to front-office / trading environments in a financial institution
* Experience maintaining or supporting production systems (DevOps-lite, more dev than ops)
* Technical degree in Computer Science, Mathematics, Physics, Engineering, or equivalent experience
Beneficial Experience:
* Experience with Python, C++, or additional programming languages
* Exposure to cloud/grid computing platforms (e.g., AWS, Azure)
* Knowledge of AI/Data Science techniques applied to financial problems
* Full-stack development experience
* Awareness of regulatory or compliance considerations
This is a high-impact mid-level contract opportunity, offering:
* £600–£800 per day
* 4 days per week in the office
* Ownership of existing front-office systems, working closely with traders and quants
* Exposure to cloud/grid infrastructure and strategic projects