Software Developer - Clearing Technology in London

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 Technology Department delivers differentiation, scalability and security for the business. 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. The 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.

As a Senior Full Stack Developer specialising in C# .NET, you will be a pivotal member of our Software Development team in Clearing Technology, driving an AI-first approach to the creation and enhancement of secure, responsive web-based platforms. You will leverage modern AI-assisted development tools and practices to accelerate delivery, improve code quality, and enhance developer productivity, while ensuring solutions meet the high standards of control, auditability, and reliability required within financial systems, including compliance with SOX (Sarbanes‑Oxley) requirements. Your expertise as a full stack developer in C# .NET and Node.js will be instrumental in delivering robust, scalable, and well‑governed applications. You will maintain a strong emphasis on testing, traceability, and deterministic system behaviour.

Responsibilities

• Design, develop, and test components of modern, secure web‑based post trade platforms, applying AI‑assisted development practices to improve quality and delivery speed.
• Contribute to the overall architecture and design of technology solutions, incorporating AI‑enabled tooling and automation while ensuring control, transparency, and auditability.
• Develop solutions to a high standard that are maintainable, testable, and aligned to acceptance criteria, with a strong emphasis on traceability and deterministic behaviour in regulated environments.
• Leverage AI tools responsibly across the software development lifecycle (e.g. code generation, testing, documentation), ensuring outputs are reviewed, validated, and compliant with engineering standards.
• Communicate effectively with team members, contribute ideas, and stay current with emerging technologies and modern engineering practices.
• Ensure delivered systems are production‑ready, secure, and well‑documented, supporting operational handover and ongoing audit requirements.
• Follow coding standards and defined development processes, ensuring consistency, quality, and compliance across all deliverables.
• Resolve third line support issues in a professional and timely manner, applying a structured and analytical approach to problem solving.

All staff

• Ensuring compliance with the company’s regulatory requirements under the FCA, NFA, AMF, AFM, MAS.
• 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.

Skills, Experience and Competencies

Essential skills and experience

• Experience in C# .NET, Node.js, React, JavaScript, Typescript.
• Experience leveraging AI‑assisted development tools (e.g. code generation, automated testing, developer productivity tooling) to improve delivery speed and quality.
• Strong understanding of applying AI responsibly within the software development lifecycle, ensuring traceability, auditability, and control.
• Experience of NoSQL or RDMS databases.
• Infrastructure as Code, Terraform or equivalent.
• Modern CI/CD and DevOps practices.
• Cloud technology, ideally AWS (Amazon Web Services).
• Knowledge of BDD/TDD.
• Agile and scrum development methodologies.
• Methodical approach to software architecture and design and experience employing the right design choices for a given project.
• Excellent verbal and written communication skills.

Desirable

• Understanding of financial products across derivatives, FX, commodities, cash equities or fixed income.
• Good knowledge of the post‑trade lifecycle, including confirmation/affirmation, allocations, settlement, clearing, collateral and margin, lifecycle events, reconciliations, and exceptions management.
• Exposure to embedding AI capabilities into end‑user applications (e.g. intelligent workflows, automation, or decision support).
• Experience of SOLID.
• Experience of Domain Driven Design.
• Experience working in a regulated environment and knowledge of the financial markets.

Competencies

• A collaborative team player, approachable, self-efficient, and able to foster a positive engineering culture, including adoption of AI‑first practices.
• Demonstrates curiosity, particularly in emerging technologies, AI capabilities, and continuous improvement of development practices.
• Resilient in a challenging, fast‑paced, and regulated environment.
• Excels at building relationships, networking, and influencing others across both technical and business teams.
• Strategic collaborator with insight and agility, able to anticipate future challenges, including those related to scale, regulation, and technology evolution, ensuring operational effectiveness.

Conduct Rules

• Act with integrity.
• Act with due skill, care and diligence.
• Be open and cooperative with the FCA, the PRA and other regulators.
• Pay due regard to the interests of customers and treat them fairly.
• Observe proper standard of market conduct.
• Act to deliver good outcomes for retail customers.

Company Values

• Be collaborative - by working together across the organisation, we foster teamwork, can better respond to challenges and successfully deliver for our clients.
• Act with integrity - we pride ourselves on our honesty and high ethical standards.
• Be adaptable and entrepreneurial - we embrace change as markets evolve to constantly increase our efficiency and create innovative solutions for our clients.
• Be respectful – how we treat each other, and our clients says everything about who we are.
• Nurture talent – we aim to grow our own talent and make Marex the place ambitious, hardworking and talented people choose to build their career.
• Adaptable and Nimble - Our size and flexibility is an advantage.