SeniorSoftware Developer: Analytics

Rex Technologies GmbH; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A global financial services provider is seeking a Senior C# Developer to join their Analytics Development Team in London. The successful candidate will drive the design and development of high-performance trading systems, collaborate closely with various teams, and uphold Agile best practices. Proficiency in C# and Python, alongside strong communication skills, is essential for this role, which promotes an inclusive work environment.

Qualifications

• Expert in C# programming language.
• Strong experience in Python for backend development.
• Hands-on experience with modern front-end technologies.
• Exceptional mathematical and analytical abilities.
• Solid understanding of risk sensitivities and derivative products.
• Familiarity with cloud technology, ideally AWS.

Responsibilities

• Contribute to architecture and implementation of solutions.
• Collaborate with managers to shape the development roadmap.
• Ensure systems meet production standards and are well-documented.
• Participate in Agile ceremonies and apply best practices.
• Troubleshoot and resolve support issues efficiently.

Skills

C#

Python

React

JavaScript

TypeScript

SQL Server

MongoDB

Terraform

AWS

Job description

About Marex

Marex Group plc is a diversified global financial services platform, providing essential liquidity, market access and infrastructure services to clients in the energy, commodities and financial markets. It listed on Nasdaq Global Select Market in April 2024. With more than 35 offices in Europe, US and APAC, it has unique access across markets with significant share globally both on and off exchange. The depth of knowledge amongst its teams and divisions provides its customers with clear advantage, and its technology‑led service provides access to all major exchanges, order‑flow management via screen, voice and DMA, plus award‑winning data, insights and analytics.

For more information visit www.marex.com

Marex has unique access across markets with significant share globally both on and off exchange. The depth of knowledge amongst its teams and divisions provides its customers with clear advantage, and its technology‑led service provides access to all major exchanges, order‑flow management via screen, voice and DMA, plus award‑winning data, insights and analytics.

The Technology Department delivers differentiation, scalability and security for the business. Reporting to the CEO, Technology provides digital tools, software services and infrastructure globally to all business groups. Software development and support teams work in agile ‘streams’ aligned to specific business areas. Our other teams work enterprise‑wide to provide critical services including our global service desk, network and system infrastructure, IT operations, security, enterprise architecture and design.

Software development function creates and maintains applications, frameworks and other software components to deliver to business requirements. Developers conceive, specify, design, engineer, document, test, and deliver bug fixes as needed to provide high‑quality software solutions. Each Development team is aligned to one of Marex’s business divisions and works with a corresponding Business Technology and Application Support team.

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.

Skills and Experience:

• 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 information.

Competencies:

• 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

If you’re forging a career in this area and are looking for your next step, get in touch!

Marex is fully committed to being an inclusive employer and providing an inclusive and accessible recruitment process for all. We will provide reasonable adjustments to remove any disadvantage to you being considered for this role. We value the differences that a diverse workforce brings to the company. We welcome applications from candidates returning to the workforce. Also, Marex is committed to avoiding circumstances in which the appearance or possibility of conflicts of interest may exist within the hiring process.

If you would like to receive any information in a different way or would like us to do anything differently to help you, please include it in your application.