52 jobs in Rex Technologies GmbH

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 2,300 employees across Europe, Asia and the Americas.

For more information visit

The Enterprise Technology team sits at the centre of Marex’s technology landscape, delivering a cross- business platform that enables our trading and business streams to innovate and go to market at pace.

We provide shared capabilities including API gateways, centralised APIs, real-time data streaming, connectivity solutions and emerging AI-driven services. By building scalable, resilient and reusable platform components, the team reduces duplication, accelerates product delivery and ensures consistent standards across the organisation. Engine Room is a core part of this strategy, forming the foundation upon which next-generation digital services are built.

Marex recognises the need to provide digital services to give client’s the best possible experience. As such, the technology team at Marex is playing an increasingly important role in the evolution of the firm and enabling business growth and new products and services.

Job Reference: VN2510 & VN2511

Join the Enterprise team working on Engine Room, one of Marex’s most strategic technology initiatives. As a Full Stack C# Developer, you’ll help build and evolve a modern, enterprise-grade platform at the core of the business. We’re growing quickly and need energetic, flexible thinkers who can respond to changing demands, work collaboratively, and bring ideas to the table. If you enjoy solving complex problems in a fast-moving environment and want to help shape technology that truly matters, this is the role for you.

• Design, develop and maintain high-quality C#/.NET solutions within the Engine Room platform.
• Contribute to the development of shared enterprise capabilities including API gateways, centralised APIs, real-time data streaming, connectivity frameworks and AI-enabled services.
• Build scalable, resilient and high-performance services that support multiple business streams across Marex.
• Collaborate closely with product owners, architects and other engineering teams to translate business requirements into robust technical solutions.
• Contribute to architectural design discussions and help shape platform standards, patterns and best practices.
• Ensure solutions are secure, observable and aligned with enterprise governance and regulatory requirements.
• Support the continuous improvement of CI/CD pipelines, automated testing and DevOps practices.
• Participate actively in team discussions, technical brainstorming sessions and knowledge sharing.
• Adapt quickly to changing priorities and evolving business demands in a fast-paced environment.
• Provide support and troubleshooting for production systems where required, ensuring high availability and reliability.
• Contribute to documentation and maintain clear technical artefacts to support long-term platform sustainability.
• Promote a collaborative, inclusive and high-performing team culture.

• Ensure 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 comply with the FCA’s Code of Conduct.
• 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.
• 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.

• Strong commercial experience in C# and .NET (Core / .NET 6+) development.
• Experience building RESTful APIs and microservices in enterprise environments.
• Good working knowledge of React and modern front-end development principles.
• Experience working with AWS cloud services (e.g. ECS/EKS, Lambda, S3, RDS, API Gateway)
• Experience with event-driven architectures, ideally using Kafka.
• Understanding of CI/CD pipelines, automated testing and DevOps practices.
• Experience with Infrastructure as Code, ideally Terraform.
• Strong understanding of software design principles (SOLID, clean architecture, domain-driven design concepts).
• Experience working in Agile/Scrum delivery environments.

• Working knowledge of Node.js and/or Python.
• Experience building or contributing to enterprise platform or shared services environments.
• Exposure to API gateway technologies and distributed systems design.
• Experience implementing observability tooling (logging, monitoring, tracing).
• Financial services or capital markets experience (advantageous but not essential). · Experience using CDM as a data model (advantageous but not essential).

• Collaborative team player, approachable, self-efficient and influences a positive work environment
• Demonstrates curiosity
• Resilient in a challenging, fast-paced environment
• Ability to take a high level of responsibility in a fast pace and high-volume environment
• Excels at building relationships, networking and influencing others
• Strategic collaborator with insight and agility, able to anticipate future challenges, ensuring operational effectiveness

You must:

• 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

• Respect - Clients are at the heart of our business, with superior execution and superb client service the foundation of the firm. We respect our clients and always treat them fairly.
• Integrity - Doing business the right way is the only way. We hold ourselves to a high ethical standard in everything we do – our clients expect this and we demand it of ourselves.
• Collaborative - We work in teams - open and direct communication and the willingness to work hard and collaboratively are the basis for effective teamwork. Working well with others is necessary for us to succeed at what we do.
• Developing our People - Our people are the basis of our competitive advantage. We look to “grow our own” and make Marex the place ambitious, hardworking, talented people choose to build their careers.
• Adaptable and Nimble - Our size and flexibility is an advantage. We are big enough to support our client’s various needs, and adaptable and nimble enough to respond quickly to changing conditions or requirements. A non-bureaucratic, but well controlled environment fosters initiative as well as employee satisfaction.

Acting as a role model for the values of the Company:

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

If you would like to receive any information in a different way or would like us to do anything differently to help you, please include it in your application.

Role Summary

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.

• 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.

• 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.

• 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.

• 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.

• 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.

• 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.

Rex Technologies GmbH is looking for a Full‑stack Software Engineer in Belfast, UK, to enhance and develop secure, responsive web applications for trading technology. You will work within a collaborative team focused on delivering high-quality solutions and adhering to the best practices in software development.

The ideal candidate should have experience in both front‑end and back‑end development, particularly with C#, .NET, and React. A sound understanding of cloud technologies and regulatory compliance in the financial services sector is essential.

Marex Group plc is looking for a Software Developer to join the Technology department in London. You will work on key Risk Engines and enhance business processes using your full-stack Python skills, focusing on numerical processing and scalable applications.

The ideal candidate shall be proficient in Cloud Data Technologies, particularly AWS. The role promises skill development while fostering a collaborative environment.

Rex Technologies GmbH is seeking a Full‑stack Software Engineer for its Prime Services Software Development team in Belfast. This role focuses on both front‑end and back‑end development, working on secure web applications tailored for trading technology. Candidates should have strong skills in C#, .NET, and React, ensuring quality and compliance within an agile environment.

The position emphasizes collaboration across teams, automating build and deployment processes. The company supports an inclusive work culture and welcomes applications from diverse backgrounds.

Rex Technologies GmbH is seeking a Senior Full Stack Developer specializing in C# .NET to enhance secure, web-based platforms. In this pivotal role, you will leverage AI-assisted tools to improve code quality and delivery speed, ensuring compliance with financial regulations.

Ideal candidates have solid experience in C# .NET and Node.js, with an emphasis on testing and traceability. The position fosters collaboration and requires staying current with emerging technologies.

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 2,300 employees across Europe, Asia and the Americas.

For more information visit

VN2508

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. Our other teams work enterprise-wide to provide critical services including our global service desk, network and system infrastructure, IT operations, security, enterprise architecture and design. The Software Development function creates and maintains applications, frameworks and other software components to deliver to business requirements. Developers conceive, specify, design, programme, document, test, and delivery bug fixes as needed to provide high quality software solutions. Each Development team is aligned to one of Marex’s business divisions and works with a corresponding Business Technology and Application Support team.

The QA proactively assists with the business stream Enterprise with increasing the quality of the systems they build and maintain. Working with QA, developers and stakeholders to strive to improve system reliability, ensure fulfilment of business requirements, and prevent regression.

All employees are expected to understand and comply with any Sarbanes Oxley operational requirements relevant to their role.

Role specific:

• Test automation: Design, build, and maintain automated test scripts and frameworks to reduce manual work.
• Shift-left integration: Collaborate early with developers and product managers to identify risks and define quality standards before writing code.
• CI/CD support: Integrate automated tests into continuous integration and deployment pipelines to provide rapid feedback on each code change.
• Technical Testing: Conduct specialized tests beyond UI checks, including API testing. Proactively investigating into performance/load testing, and database integrity verification.
• Defect management: Involves root-cause analysis to help developers prevent bug recurrence.
• Process governance: Establish and maintain quality standards, documentation, and select appropriate testing tools within the QA team.
• Coaching: QAs and developers on test quality, automation best practices, and testing discipline.
• Requirement Analysis: Reviewing business requirements and user stories to ensure they are clear, complete, and testable.
• Defect management: Find, log, and track bugs using Jira, collaborating with developers to confirm fixes.
• Quality reporting: Preparing reports for stakeholders detailing the software's readiness for release.
• AI: Championed AI-driven quality initiatives by leveraging Generative AI and NLP to automate the conversion of user stories into Playwright scripts, reducing script development time and increasing sprint velocity.

• Ensure 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 comply with the FCA’s Code of Conduct.
• 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.
• 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.

• Excellent verbal and written communication skills.
• A collaborative team player, approachable, self-efficient and influences a positive work environment.
• Demonstrates curiosity.
• Resilient in a challenging, fast-paced environment.
• Excels at building relationships, networking and influencing others.
• Maintain a commitment to continuous professional development by acquiring proficiency in emerging tools and frameworks.
• Strategic collaborator with insight and agility, able to anticipate future challenges, ensuring operational effectiveness.
• Attention to detail and a passion for driving up the quality of software.

Essential:

• Middle Level QA Automation Engineer
• Experienced in the configuration and implementation of a cross section of automated testing approaches and tools; unit, UI, browser, contract/API, performance/load, Playwright, Postman, Swagger etc.
• Experienced in following application(s) all beneficial: JIRA, XRAY, WIKI, Bitbucket cloud, AWS, Splunk, SQL, MongoDB
• Understanding of software diagnostic tools and testing methods (automation, smoke, functionality, usability, performance, regression, and user acceptance).
• Experience working closely with development teams and championing an automation-first and shift-left approach to quality control.
• Experience working in a regulated environment and knowledge of the risk and compliance requirements associated with this.
• Agile and scrum development methodologies.

• Experienced in following domains all beneficial: Financial background

• 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

Respect – Clients are at the heart of our business, with superior execution and superb client service the foundation of the firm. We respect our clients and always treat them fairly.

Integrity – Doing business the right way is the only way. We hold ourselves to a high ethical standard in everything we do – our clients expect this and we demand it of ourselves.

Collaborative – We work in teams – open and direct communication and the willingness to work hard and collaboratively are the basis for effective teamwork. Working well with others is necessary for us to succeed at what we do.

Developing our People – Our people are the basis of our competitive advantage. We look to “grow our own” and make Marex the place ambitious, hardworking, talented people choose to build their careers.

Adaptable and Nimble – Our size and flexibility is an advantage. We are big enough to support our client’s various needs, and adaptable and nimble enough to respond quickly to changing conditions or requirements. A non-bureaucratic, but well controlled environment fosters initiative as well as employee satisfaction.

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

If you would like to receive any information in a different way or would like us to do anything differently to help you, please include it in your application.

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 2,300 employees across Europe, Asia and the Americas.

We are seeking an experienced Senior Counterparty Exposure Risk Manager to oversee the counterparty exposures of Marex Solutions business. The successful candidate will play a key role in ensuring robust risk management, monitoring exposures, and partnering with trading, structuring, and control functions to manage risk across multiple asset classes.

• Risk Oversight: Monitor and manage counterparty exposures and market risk of Marex Solutions global business, with a focus on OTC derivatives and structured and exotic derivatives in Commodities, FX, Rates & Credit, Digital Assets and cross-asset products.
• Risk Analysis: Evaluate derivative structures, assess embedded risks, and ensure they are appropriately captured in risk systems and metrics.
• Risk and Limit Frameworks: Define, review, enhance risk measurements and methodologies, and enforce risk limits; challenge the adequacy of risk-taking activities relative to approved risk appetite.
• Product Coverage: Provide independent risk assessment of new products and complex structures, ensuring risks are well understood and controlled.
• Stakeholder Engagement: Partner with sales and trading teams, structuring, model validation, finance, and risk methodology teams to ensure accurate pricing, valuation, and risk representation.
• Governance & Reporting: Deliver clear and timely risk reporting to senior management, highlighting key risk drivers, trends, and emerging risks.
• Regulatory Compliance: Ensure adherence to internal policies and external regulatory requirements, including stress testing, capital requirements, and market conduct standards.

• Technical & Analytical Skills
  • Risk Identification & Assessment: Skill in analysing potential operational, financial, and strategic risks using qualitative and quantitative methods.
  • Risk Analysis: Proficiency in using programming tools (e.g., Python, SQL, advanced Excel and PowerBI) for risk forecasting, scenario analysis, and stress testing.
  • Product Knowledge: A deep understanding of multiple asset classes (equities, fixed income, commodities, FX, derivatives) including their valuation and associated pricing models.
  • Regulatory Compliance: In-depth knowledge of relevant regulatory frameworks and ensuring the company remains compliant.
• Leadership & Interpersonal Skills
  • Communication & Stakeholder Management: The ability to articulate complex risk concepts and findings clearly and persuasively to diverse audiences, including senior management, traders, and regulatory bodies.
  • Collaboration: Proven experience in managing key stakeholders and coordinating across cross-functional teams.
  • Problem-Solving & Decision-Making: The ability to analyse issues, draw on expert advice, and make sound, well-reasoned recommendations under pressure.
  • Strategic Thinking & Business Acumen: The capacity to link risk management practices with overall business objectives and provide insights that align with the organization's goals and strategies.

• Bachelor’s or Master’s degree in Finance, Mathematics, Engineering, or a related quantitative discipline; CFA/FRM is a plus.
• Circa 15+ years of market risk or trading/structuring experience within a leading financial institution, with exposure to structured and exotic derivatives.
• Deep understanding of derivative pricing models and risk sensitivities across multiple asset classes (Equity, FX, Rates, Credit, Commodities and Digital assets).
• Strong knowledge of risk management frameworks, stress testing methodologies, and capital/regulatory requirements.
• Excellent analytical skills and ability to interpret complex risks into clear, actionable insights.
• Strong communication skills with the ability to challenge senior stakeholders and present risk issues concisely.
• Familiarity with risk systems (e.g. Sophis, Bloomberg or in-house platforms) and corresponding data flows. Programming skills (Python, VBA, SQL and PowerBI) highly advantageous.

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

If you would like to receive any information in a different way or would like us to do anything differently to help you, please include it in your application.