Senior Software Engineer

Spectrum IT Recruitment; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Spectrum IT Recruitment is actively seeking a Senior Software Developer to architect, develop and enhance in-house trading and research systems. This role offers work on greenfield projects, with influence on architectural decisions and measurable impact on live trading strategies.

You will primarily work within a C# / .NET / SQL Server / ASP.NET ecosystem, delivering high-performance, reliable software and contributing to scalability and maintainability across critical systems.

Qualifications

• Bachelor's degree in computer science or related field.
• Strong experience with C# and the latest .NET Platform.
• 5+ years of professional software development experience.
• Solid experience with relational databases (SQL Server/Oracle).
• Strong OO design, scalable system experience, and English proficiency.
• Experience with multi-threaded programming and distributed version control.
• Exposure to financial markets or trading systems is desirable.

Responsibilities

• Design, develop, and maintain high-performance applications in C# and .NET.
• Lead architectural discussions and contribute to technical direction.
• Build scalable, reliable systems to support automated trading and research.
• Develop and optimise database solutions (SQL Server or equivalent).
• Improve performance, reliability, and automation across systems.
• Mentor junior developers and promote best engineering practices.
• Participate in code reviews and enforce high standards of quality.
• Collaborate closely with researchers and traders to translate requirements into robust software solutions.
• Contribute to continuous improvement of development processes and tooling.

Skills

C#

.NET

SQL

Architecture

Multi-threading

Git

Windows

Trading systems exposure

Education

BSc in Computer Science

Tools

SQL Server

Oracle

Job description

Excellent opportunity for a Senior Software Developer to play a key role in architecting, developing, and enhancing our clients in-house trading and research systems.

This is an opportunity to work on greenfield projects, influence architectural decisions, and directly impact systems that support real-world trading strategies. As a senior member of the team, you will contribute both technically and strategically, helping shape development standards, performance optimisation, and system scalability.

You will primarily work within a C# / .NET / SQL Server / ASP.NET ecosystem, developing high-performance, reliable, and maintainable applications.

Key Responsibilities

• Design, develop, and maintain high-performance applications in C# and .NET
• Lead architectural discussions and contribute to technical direction
• Build scalable, reliable systems to support automated trading and research
• Develop and optimise database solutions (SQL Server or equivalent)
• Improve performance, reliability, and automation across systems
• Mentor junior developers and promote best engineering practices
• Participate in code reviews and enforce high standards of quality
• Collaborate closely with researchers and traders to translate requirements into robust software solutions
• Contribute to continuous improvement of development processes and tooling

Required Skills & Experience

• BSc (or higher) in Computer Science or a related scientific discipline
• Strong recent experience with C# and the latest .NET platform
• 5+ years of professional software development experience
• Solid experience with SQL Server, Oracle, or equivalent relational databases
• Strong understanding of object-oriented design principles and software architecture
• Experience building production-grade, scalable systems
• Fluency in English with excellent written and verbal communication skills
• High attention to detail and a thorough, analytical mindset
• Experience in multi-threaded and concurrent application development
• Network programming experience (TCP/UDP)
• Experience with distributed version control systems (Git)
• Strong understanding of Windows technologies
• Exposure to financial markets or trading systems