Software Developer - Prime Services in Belfast

As a Full‑stack Software Engineer specializing in both front‑end and back‑end development, experienced in React or C# .NET, you will be a key member of our Prime Services Software Development team. You will contribute to the creation and enhancement of secure, responsive web applications and services tailored for front‑to‑back trading technology, including greenfield, re‑platforming and migration to AWS cloud. You will work closely with the platform engineering team to ensure seamless integration and deployment, and with QA to deliver an automation‑first and shift‑left approach to quality control.

Responsibilities

• Code across all proprietary applications and services that constitute the Marex Prime Services (Capital Markets) technology platform.
• Take accountability for the quality of your deliverables, adopt an automation‑first approach to quality control, adhere to coding standards and participate in peer reviews and pull requests.
• Work with platform engineering to automate build and deploy of existing and new systems.
• Align with Marex delivery process and agile principles, engage in scrum ceremonies, contribute to estimation and scheduling, and resolve impediments.
• Work collaboratively within the scrum team and across the technology function.

All staff

• Ensure 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.
• Model the highest level of integrity and conduct, reflecting Company Values.
• Comply with the FCA’s Code of Conduct at all times.
• Be fully aware of and adhere to internal policies that relate to your role or any other activities for which you have responsibility.
• Report any breaches of policy to Compliance and/or your supervisor as required.
• Escalate risk events immediately.
• Provide input to risk management processes, as required.

Competencies, Skills, Experience & Qualifications

• Engineering: C#, .NET 4.8, ASP.NET, React, JavaScript/TypeScript, HTML, CSS, SQL.
• Tools / Technologies / Infrastructure: Node.js, cloud/AWS, Bitbucket (Git), SQL Server, Jira.
• Design: API, HTTP/REST, JSON, micro‑services and distributed systems.
• SDLC: Agile, Scrum, Kanban, DevOps, CI/CD; understanding of and advocacy for Agentic AI / Context Engineering.

Desirable

• Engineering: Java, Vue, Angular, .NET Core, Kendo UI.
• Tools / Technologies / Infrastructure: Docker, Kubernetes, RabbitMQ, Kafka, Azure, GCP, NoSQL, DNS, NServiceBus, IIS.
• Design: Serverless, cloud‑native/PaaS, event‑driven, pub/sub, real‑time/websockets, architectural design records (ADRs).
• SDLC: Agentic AI / Context Engineering; CoPilot, Claude, Codex, building custom agents across full SDLC.
• Financial Services Ecosystem: Market data, Bloomberg; experience working in a regulated environment and knowledge of the risk and compliance requirements associated with this.

Competencies

• Excellent verbal and written communication skills.
• A collaborative team player, approachable, self‑efficient and capable of influencing a positive work environment.
• Demonstrates curiosity.
• Resilient in a challenging, fast‑paced environment.
• Ability to take a high level of responsibility in a fast‑paced, high‑volume environment.
• Excels at building relationships, networking and influencing others.

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 standards of market conduct.
• Act to deliver good outcomes for retail customers.

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. Marex is also committed to avoiding circumstances in which the appearance or possibility of conflicts of interest may exist within the hiring process.