About Marex Marex Group plc (NASDAQ: MRX) is a diversified global financial services platform providing essential liquidity, market access and infrastructure services to clients across energy, commodities and financial markets. The group provides comprehensive breadth and depth of coverage across four core services: clearing, agency and execution, market making, and hedging and investment solutions. It has a leading franchise in many major metals, energy and agricultural products, with access to 60 exchanges. The group provides access to the world’s major commodity markets, covering a broad range of clients that include some of the largest commodity producers, consumers and traders, banks, hedge funds and asset managers. With more than 40 offices worldwide, the group has over 3000 employees across Europe, Asia and the Americas. For more information visit https://www.marex.com/ Job Reference: VN2893 Overview of Marex / Department description Marex Group plc (NASDAQ: MRX) is a diversified global financial services platform providing essential liquidity, market access and infrastructure services to clients across energy, commodities and financial markets. The group provides comprehensive breadth and depth of coverage across four core services: clearing, agency and execution, market making, and hedging and investment solutions. It has a leading franchise in many major metals, energy and agricultural products, with access to 60 exchanges. The group provides access to the world’s major commodity markets, covering a broad range of clients that include some of the largest commodity producers, consumers and traders, banks, hedge funds and asset managers. With more than 40 offices worldwide, the group has over 3,000 employees across Europe, Asia and the Americas. 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 secure, scalable digital tools, software services, and infrastructure across all business units. Agile development teams align with specific business areas, while other teams handle enterprise-wide IT operations, support, security, and architecture. The Data & AI team drives productivity, compliance, and insights by leveraging a robust Data Lakehouse, decentralizing data access, improving client experiences, promoting data-driven practices, and ensuring efficient, auditable use of data in line with commercial terms. Role Summary Role specific: Architect and develop enhancements to the Security Master Platform, improving data quality, processing speed, and scalability at enterprise scale. Design and implement robust ETL pipelines to extract, transform, and load reference data from the Bloomberg Data License or alternate vendor APIs and/or file feeds. Build extensible frameworks to onboard new market data vendors and alternative reference data sources as business requirements evolve. Write, optimise, and maintain complex, high-performance SQL queries, stored procedures, and schemas tailored for large-scale financial datasets. Develop and maintain RESTful services using C#, .NET Core/.NET 8+, and Minimal APIs, following modern secure development practices. Provide day-to-day operational support to ensure seamless execution of daily data loads, batch processing, and data distribution. Monitor the platform proactively, troubleshoot data discrepancies, and rapidly resolve production issues to minimise downstream impact on trading and risk systems. Implement automated data validation rules and monitoring alerts to safeguard the accuracy and completeness of Security Master data. Develop usage-tracking capabilities across downstream data consumers to identify and eliminate unused feeds and data duplication, supporting commercial and cost optimisation. Deploy and support applications on AWS (EC2, IAM, S3, Redis) using containerised, cloud-native design principles. Build and maintain CI/CD pipelines for automated build, test, and deployment of platform enhancements. Act as a technical bridge between the Market Data Engineering team, downstream consumers (trading, risk, compliance), and external vendors. All staff: Ensuring compliance with the company’s regulatory requirements under the FCA. Adhere to the operational risk framework for your role ensuring that all regulatory or company determined parameters are complied with. Role model for demonstrating highest level standards of integrity and conduct and reflecting Company Values. At all times complying with the FCA’s Code of Conduct. To ensure that you are fully aware of and adhere to internal policies that relate to you, your role or any other activities for which you have any level of responsibility. To report any breaches of policy to Compliance and/ or your supervisor as required. To escalate risk events immediately. To provide input to risk management processes, as required. The Company may require you to carry out other duties from time to time Competencies, Skills and Experience Core Competencies Excellent verbal and written communication skills. A collaborative team player, approachable, self-efficient and influences a positive work environment. Exceptional analytical skills, with the ability to debug complex data lineage issues under time-sensitive constraints. Resilient and adaptable, comfortable balancing structured development work with fast-paced operational demands. Ability to take a high level of responsibility in a fast-paced and high-volume environment. Excels at building relationships, networking and influencing others across technical and business teams. Essential: Skills and Experience Strong commercial experience developing enterprise applications using C# and .NET Core/.NET 8+. Exper