Senior Software Developer, Market Making Tech

Marex Group; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Marex is seeking a Market Making Senior Software Developer in London to design, develop and maintain high‑quality applications across internal and client-facing platforms. You will build scalable services, collaborate with product owners and engineers, and help shape platform standards within a technology-driven market making context.

You will work in a dynamic, regulated environment, applying modern CI/CD, DevOps and testing practices to deliver reliable software and improve operational

Qualifications

• Experience in C# .NET.
• Experience in JavaScript/TypeScript/React/NodeJS/GraphQL.
• Experience with NoSQL or RDMS databases.
• Knowledge of CI/CD and DevOps practices.
• Experience with AWS cloud services (ECS/EKS, Lambda, S3, RDS).
• Knowledge of BDD/TDD.
• Experience in Agile/Scrum delivery environments.
• Strong software architecture and design approach.

Responsibilities

• Design, develop and maintain high-quality internal and external applications.
• Build scalable, resilient services supporting multiple business streams.
• Collaborate with product owners, architects and other teams to translate requirements.
• Contribute to architectural design discussions and platform standards.
• Ensure solutions are secure, observable and compliant with governance.
• Support CI/CD pipelines, automated testing and DevOps practices.
• Participate in team discussions and knowledge sharing.
• Adapt to changing priorities in a fast-paced environment.
• Provide production support ensuring high availability.

Skills

C# .NET

JavaScript/TypeScript/React/NodeJS

GraphQL

NoSQL or RDMS databases

CI/CD

AWS (ECS/EKS, Lambda, S3, RDS)

BDD/TDD

Agile/Scrum

Software architecture

Verbal and written communication

Tools

Docker

Microsoft Technologies

Job description

Marex is seeking a Market Making Senior Software Developer in London to design, develop and maintain high‑quality applications across internal and client-facing platforms. You will build scalable services, collaborate with product owners and engineers, and help shape platform standards within a technology-driven market making context.

You will work in a dynamic, regulated environment, applying modern CI/CD, DevOps and testing practices to deliver reliable software and improve operational