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Software Developer - Finance Technology

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Marex Group
Full Time position
Listed on 2026-06-03
Job specializations:
  • Software Development
    Software Engineer, DevOps
Salary/Wage Range or Industry Benchmark: 80000 - 100000 GBP Yearly GBP 80000.00 100000.00 YEAR
Job Description & How to Apply Below
Location: Greater London

As a Senior Developer specialising in C# .NET, you will be a pivotal member of our Software Development team, driving an AI‑first approach to the creation and enhancement of secure, responsive web‑based finance platforms. These platforms will modernise and extend core People Soft finance capabilities, delivering improved usability, performance, and scalability through contemporary web technologies.

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 in C# .NET, combined with your ability to apply AI‑driven techniques across the software development lifecycle, will be instrumental in delivering robust, scalable, and well‑governed applications. You will maintain a strong emphasis on testing, traceability, and deterministic system behaviour, ensuring that AI adoption enhances—rather than compromises—system integrity, auditability, and regulatory compliance.

In this role, you will apply your architectural experience to help mature our existing software estate, introducing intelligent automation where appropriate and transforming legacy People Soft‑based functionality into cloud‑native, web‑first solutions. You will work closely with the platform engineering team to ensure seamless integration and deployment, while embedding AI‑enabled tooling and practices in a controlled, transparent, and compliant manner across the development lifecycle.

Responsibilities
  • Design, develop, and test components of modern, secure web‑based finance applications, 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.
  • Adhere to development best practices and processes, including those required for SOX compliance (e.g. change control, segregation of duties, and auditability).
  • 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, particularly in AI and modern engineering practices.
  • Liaise with business users to gather and refine application requirements, particularly in the context of modernising legacy finance platforms (e.g. People Soft).
  • 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.
Skills and Experience
  • 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 with No

    SQL or RDMS databases.
  • Experience with Infrastructure as Code, Terraform or equivalent.
  • Modern CI/CD and Dev Ops 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.
  • Understanding of controls required in regulated environments, including SOX (Sarbanes‑Oxley), with a focus on auditability, segregation of duties, and change…
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