Front office C# Developer

Location: London
Working Pattern: Hybrid, 3 days per week in the office
Sector: Investment Banking / Financial Services
Level: Vice President
Employment Type: Permanent

We are working with a leading global investment bank seeking an experienced VP-level C# Software Engineer to join its Front Office Securities Financing Technology function in London.

This is an opportunity to take technical ownership within a global engineering team responsible for developing and supporting business-critical trading platforms.

The organisation is investing significantly in its technology capabilities, evolving from a predominantly Microsoft-based environment towards a modern, cloud-enabled architecture incorporating C#, .NET Core, Java, AWS, Kafka and Redis
.

The successful candidate will combine strong hands‑on engineering expertise with the ability to independently design, architect and deliver complex software solutions supporting global trading operations.

• Design, develop and enhance high-performance C#/.NET applications supporting front office trading and securities financing activities.

• Take technical ownership of projects from initial requirements and architectural design through development, deployment and production.

• Contribute to the modernisation of existing applications and the development of strategic cloud-based platforms.

• Design scalable, maintainable solutions using modern software engineering principles and distributed technologies.

• Work collaboratively with engineering teams and business stakeholders across London, New York and Asia.

• Evaluate technical approaches, make architectural decisions and drive engineering best practices.

• Leverage AI-assisted development tools to improve engineering productivity, code quality and delivery efficiency.

• Strong commercial software engineering experience using C# and .NET
  , with excellent programming fundamentals.

• Proven experience designing and delivering complex enterprise applications within investment banking or capital markets.

• Knowledge of Securities Lending, Stock Loan, Securities Financing, Equity Financing or Equity Swaps
  .

• Demonstrable experience taking ownership of technical architecture and delivering substantial projects independently.

• Strong understanding of object‑oriented design, data structures, algorithms and software engineering principles.

• Experience working with relational databases such as SQL Server or MySQL.

• Ability to articulate architectural decisions, evaluate technical trade‑offs and solve complex engineering challenges.

• AWS or another major cloud platform, ideally involving application modernisation or cloud‑native development.

• Modern .NET / .NET Core.

• Java development experience alongside C#.

• Distributed systems, Kafka, Redis or event‑driven architectures.

• Experience developing applications supporting OTC derivatives or complex trade lifecycle processing.

• Practical experience using AI-assisted engineering tools such as Git Hub Copilot or Claude.

We are particularly interested in engineers who operate beyond simply delivering assigned development tasks.

You will be comfortable taking a business requirement, defining the technical solution, making architectural decisions and owning delivery through to production.

This is a hands‑on technical position
, suited to an experienced engineer who enjoys solving complex problems and taking genuine responsibility for the systems they build.

Candidates with a strong Java background and previous substantial C# experience will also be considered.