Senior Software Engineer

Spectrum IT Recruitment; Greater London; On-site; GBP 85,000 - 110,000; Full time

Job summary

Spectrum IT Recruitment is seeking a Senior Software Developer to help architect, develop, and enhance in-house trading and research systems. You will work on greenfield projects, influence architectural decisions, and impact systems that support real-world trading strategies.

You will mainly work in a C# / .NET / SQL Server / ASP.NET ecosystem, delivering high-performance, reliable applications, mentoring peers, and collaborating with researchers and traders to translate requirements into

Qualifications

• BSc (or higher) in Computer Science or related discipline.
• 5+ years of professional software development experience.
• Strong experience with C# and the latest .NET platform.
• Experience with SQL Server, Oracle, or equivalent relational databases.
• Experience in multi-threaded and concurrent application development.
• Fluency in English with excellent communication skills.
• Exposure to financial markets or trading systems.

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 Server

Software architecture

Multithreading

Git

Windows

Trading systems

English communication

Education

BSc (or higher) in Computer Science

Tools

Git

SQL Server

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