Software Engineer, Backend Developer

This range is provided by Cipher Tek Recruitment. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

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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 £700/day

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.

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:

• Leading initiatives on DB modernisation and performance optimisation
• Archiving legacy data from key tables with precision to ensure smooth migrations
• 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 of .NET 8 and .NET 4.8
• SQL Server Proficiency:
  Strong fundamentals in querying, table design, and ETL processing large datasets (performance tuning not required)
• Expertise:
  Familiarity with Entity Framework or other ORMs is a plus, but not essential
• Async & Multithreading Mastery:
  Experience in low-latency, data-driven applications
• 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 £700

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.

• Seniority level
  
  Mid-Senior level

• Employment type
  
  Contract

• Job function
  
  Engineering, Consulting, and Information Technology
• Industries Investment Banking and Technology, Information and Media

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