c# developer, banking, £750 Outside IR35, Remote, London

c# developer, banking, £750 Outside IR35, Remote, London

Posted 2 days ago by CipherTek Recruitment

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Negotiable
Outside
Remote
London, UK
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.NET Framework Active Server Pages (ASP) Application Programming Interface (API) ASP.NET ASP.NET Core Azure Kubernetes Service Back End (Software Engineering) C# (Programming Language) Containerisation Continuous Integration and Continuous Delivery Extract Transform Load (ETL) File Servers Finance Garbage Collection (Computer Science) Investments Kubernetes Microsoft SQL Servers Multithreading Performance Tuning Real Time Systems RESTful API Scalability Software Development SQL (Programming Language) Systems Design

Summary: The role of Expert .NET Developer focuses on modernizing and enhancing cross-asset trading systems for a leading investment bank. It requires a hands-on expert with strong skills in low-level C# and SQL Server, particularly in financial environments. The position offers remote work with occasional travel to London and emphasizes tackling complex, real-time data-driven applications. This is a tech-heavy role that prioritizes performance, reliability, and scalability over business knowledge.

Key Responsibilities:

  • Design, develop, and maintain RESTful APIs using .NET technologies (C#, ASP.NET Core).
  • Redesigning and refactoring high-activity tables to improve performance and maintainability.
  • Developing frameworks and tooling for Real Time monitoring of trading systems.
  • Modernising and upgrading Legacy codebases, driving best practices in .NET development.

Key Skills:

  • Expert .NET Developer: Deep knowledge.
  • SQL Server Proficiency: Strong fundamentals in querying, table design, and ETL processing large datasets (performance tuning not required).
  • ADO.NET Expertise: Familiarity with EntityFramework or other ORMs is a plus, but not essential.
  • Async & Multithreading Mastery: Experience in Real Time, data-driven applications.
  • Design and build scalable, high-performance Back End services using .NET.
  • Familiarity with containerization and orchestration (Docker, Kubernetes) is a plus.
  • Experience with CI/CD pipelines and automated testing frameworks.
  • Attention to Detail: Ability to spot rare, critical issues before they reach production.
  • Previous experience in the finance industry, ideally in trading systems.

Salary (Rate): £750/day

City: London

Country: UK

Working Arrangements: remote

IR35 Status: outside IR35

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

Role: Expert .NET Developer - Cross Asset Trading System

Location: Very Flexible. Can offer Remote with occasional travel to London City offices

Contract: 12 months

Rate: Up to £750/day (OUTSIDE IR35)

About the Role:

We are partnering with a leading investment bank on an ambitious programme to modernise and enhance their cross-asset trading systems. This is a technically challenging, hands-on role, ideal for an expert .NET developer with a strong SQL Server background and experience working in financial environments.

Please note, you MUST have very strong low level C#, able to work through complex multithreaed performance issues. Good understanding of multi-threading, garbage collection, concurrency, the CLR is very important for this role.

You will be joining a highly skilled team focused on performance, reliability, and scalability, tackling complex issues in Real Time, data-driven applications. This is purely a tech-heavy role-business knowledge is helpful but not required.

What You'll Be Doing:

  • Design, develop, and maintain RESTful APIs using .NET technologies (C#, ASP.NET Core).
  • Redesigning and refactoring high-activity tables to improve performance and maintainability
  • Developing frameworks and tooling for Real Time monitoring of trading systems
  • Modernising and upgrading Legacy codebases, driving best practices in .NET development

What We're Looking For:

  • Expert .NET Developer: Deep knowledge
  • SQL Server Proficiency: Strong fundamentals in querying, table design, and ETL processing large datasets (performance tuning not required)
  • ADO.NET Expertise: Familiarity with EntityFramework or other ORMs is a plus, but not essential
  • Async & Multithreading Mastery: Experience in Real Time, data-driven applications
  • Design and build scalable, high-performance Back End services using .NET.
  • Familiarity with containerization and orchestration (Docker, Kubernetes) is a plus.
  • Experience with CI/CD pipelines and automated testing frameworks.
  • Attention to Detail: Ability to spot rare, critical issues before they reach production
  • Previous experience in the finance industry, ideally in trading systems

Why This Role Is Exciting:

  • Work remotely while tackling cutting-edge technical challenges
  • Collaborate with a high-performing team on a strategic, high-impact programme
  • Influence system design, architecture, and long-term performance improvements
  • Competitive daily rates up to £750

If you're a highly skilled .NET developer who thrives in challenging, high-stakes environments and loves working with complex, Real Time systems, this is the perfect opportunity to make an impact.

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