Senior Software Developer: Analytics

Marex is seeking a Senior C# Developer to join our Analytics Development Team in London. We’re looking for a highly skilled C# engineer with deep software engineering expertise and a strong understanding of financial markets. You’ll contribute to the design and development of advanced pricing and risk platforms, including a high-performance distributed computing and market data system that supports quantitative research and trading. This role involves close collaboration with technology, trading, and quantitative teams, ensuring solutions meet business objectives while promoting Agile best practices, robust architecture, and continuous innovation. We’re seeking a strong C# engineer who’s passionate about building scalable, high-performance systems and developing innovative products that evolve with the business.

Responsibilities

• Contribute to the architecture, design, and implementation of technology solutions developed and maintained by the team.
• Collaborate with the Software Development Manager to shape the development roadmap and define strategic priorities.
• Ensure all delivered systems meet production-quality standards, are fully documented, and support a smooth handover for long-term maintenance.
• Help define, promote, and uphold best practices in software engineering to ensure consistency, quality, and scalability across the team’s work.
• Actively participate in Agile ceremonies — including sprint planning, stand-ups, and retrospectives — ensuring principles are applied effectively.
• Support sprint delivery by ensuring stories and bugs are well-defined, prioritised, testable, and accompanied by clear acceptance criteria.
• Troubleshoot, diagnose, and resolve support issues efficiently, maintaining a professional and customer-focused approach.
• Comply with the Operational Risk Framework, meeting all regulatory, security, and company standards.
• Demonstrate and promote integrity, professionalism, and alignment with Marex values in all interactions.

• Expert in C#
• Strong in Python.
• Hands-on experience with React, JavaScript, and TypeScript for front-end development.
• Proven exceptional mathematical and analytical abilities.
• Strong understanding of risk sensitivities (“Greeks”).
• Solid experience with derivative products.
• Skilled in working with SQL Server and MongoDB databases.
• Experience implementing Infrastructure as Code using Terraform or similar tools.
• Familiar with modern CI/CD pipelines and DevOps best practices.
• Knowledge of cloud technologies, ideally AWS (Amazon Web Services).
• Proficient in using unit and integration testing frameworks to ensure code quality and reliability.
• Strong understanding of Agile and Scrum methodologies.
• Methodical approach to software architecture and design, with the ability to apply the right design patterns and principles for each project.
• Excellent verbal and written communication skills, with the ability to convey complex

• Excellent verbal and written communication skills
• A collaborative team player, approachable, self-efficient and influences a positive work environment
• Demonstrates curiosity
• Resilient in a challenging, fast-paced environment
• Ability to take a high level of responsibility in a fast pace and high-volume environment
• Excels at building relationships, networking and influencing others