Quality Assurance Specialist- MTS GUI Development

Join Euronext - Shape capital markets for future generations.

Euronext is the leading European capital market infrastructure, covering the entire capital markets value chain, from listing, trading, clearing, settlement and custody, to solutions for issuers and investors. Euronext runs MTS, one of Europe’s leading electronic fixed income trading markets, and Nord Pool, the European power market. Euronext also provides clearing and settlement services through Euronext Clearing and its Euronext Securities CSDs in Denmark, Italy, Norway and Portugal. In November 2025, Euronext successfully acquired a majority stake in the Athens Stock Exchange (ATHEX), further expanding its footprint and strengthening its pan-European market infrastructure.

As of December 2025, Euronext’s regulated exchanges in Belgium, France, Ireland, Italy, the Netherlands, Norway and Portugal host over 1,700 listed issuers with €6.7 trillion in market capitalisation, a strong blue-chip franchise and the largest global centre for debt and fund listings. With a diverse domestic and international client base, Euronext handles 25% of European lit equity trading. Its products include equities, FX, ETFs, bonds, derivatives, commodities and indices.

MTS is part of the Euronext Group, the leading European capital market, covering the entire capital markets value chain, from listing, trading, clearing, settlement and custody, to solutions for issuers and investors. We operate seven national stock exchanges, handling 25% of European lit equity trading. Our products include equities, FX, ETFs, bonds, derivatives, commodities and indices. Euronext also provides clearing and settlement services through Euronext Clearing and our network of Euronext Securities CSDs. In addition, Euronext runs MTS, one of Europe’s leading electronic fixed income trading markets, and Nord Pool, the European power market. The company has a diverse domestic and international client base.

Working with us means :

You will join a dynamic and international environment where innovation, quality and collaboration are central to our operations. You will have the opportunity to shape the direction of a major trading platform and play a key role in the development and diversification of MTS within Euronext.

The Euronext Technology & Support Centre

The ambition of the new Euronext Technology & Support Centre is to build a strong team in Greece that will support the Business Lines, IT, and Operations functions across the Group.

In its initial phase, the Centre will focus on two key initiatives:

• Graphical User Interfaces (GUI) Development Team: We will establish an in-house team responsible for developing and supporting Euronext’s Graphical User Interfaces, which are currently managed by an external provider.

• IT Clearing Test Factory: We will create an in-house Test Factory to support the Clearing House based in Italy. Euronext Clearing is a multi-asset-class clearing house that provides proven risk management capabilities for Euronext’s cash, financial and commodity derivatives markets. As the central counterparty (CCP) of choice for Euronext markets, it ensures the efficient and safe functioning of the markets.

Initial roles within the Centre will include Backend Developers, UI Developers, Business Analysts, Application Managers, and QA Engineers.

Role and key responsibilities

Join our new Tech & Support centre in Athens as a Quality Assurance Specialist in the MTS GUI Development team. You will ensure the quality, reliability and performance of the new web-based graphical user interface (GUI) for our fixed income electronic trading platforms. You will report to the Team Lead, and work closely with developers, business analysts, and technical product owners in the MTS IT team. This is an exciting opportunity to build a comprehensive QA practice from the ground up for a critical trading application and contribute to the modernisation of one of Europe's leading electronic fixed income marketplaces.

You will be primarily responsible for:

• Designing, developing and executing comprehensive test strategies and test plans for the new web-based trading GUI, covering functional, regression, integration, performance and end-to-end testing.

• Building and maintaining automated test suites using tools such as Playwright or similar frameworks, ensuring broad coverage of critical trading workflows.

• Defining and executing test scenarios for complex real-time trading interfaces.

• Collaborating with business analysts to translate acceptance criteria and user stories into detailed test cases, ensuring complete coverage of functional and non-functional requirements.

• Performing API testing (REST, WebSocket) to validate backend integration points, data integrity, error handling and real-time data streaming behaviour.

• Conducting performance and load testing to verify that the GUI meets latency, throughput and responsiveness requirements under realistic trading conditions.

• Identifying, documenting and tracking defects using issue-tracking tools (e.g. Jira), providing clear reproduction steps, impact assessments and coordination with developers for resolution.

• Contributing to the CI/CD pipeline by integrating automated tests into build and deployment processes, ensuring quality gates are maintained across environments.

• Participating in sprint ceremonies, providing QA input during planning, estimation and retrospectives, and ensuring testing activities are aligned with the agile development cadence.

• Supporting user acceptance testing (UAT) by coordinating with business stakeholders and end users, preparing test environments and documenting test results.

• Analysing the existing legacy GUI to understand current functionality and define test baselines for migration validation and feature-parity checks.

• Contributing to QA documentation, including test strategies, test case repositories, defect reports and quality metrics dashboards.

This list is non-exhaustive and may vary according to strategic priorities of the group.

Knowledge, Personality, Skills and Experience Required:

• Several years of experience in software quality assurance or test engineering, ideally in financial markets, trading platforms, capital markets technology or other real-time, data-intensive domains.

• Strong expertise in test automation for web applications, with hands-on experience in at least one modern testing framework (e.g. Playwright, or similar).

• Experience testing real-time, event-driven applications involving WebSockets, streaming data or low-latency requirements.

• Solid understanding of web application architecture, including client-server models, REST APIs, WebSockets, authentication and authorisation flows.

• Experience with API testing tools and techniques (e.g. Postman, REST Assured, custom scripts, or similar) for validating backend services and integration points.

• Familiarity with performance and load testing tools (e.g. JMeter, or similar).

• Experience working in agile environments (e.g. Scrum or Kanban) alongside developers, business analysts and product owners, with a clear understanding of defining and verifying acceptance criteria.

• Proficiency in defect tracking, test management and collaboration tools (e.g. Jira, Confluence, X-Ray or similar).

• Knowledge of JavaScript/TypeScript is a plus, enabling contribution to test automation codebases and collaboration with the development team.

• Familiarity with CI/CD tools and practices, including integrating automated tests into build pipelines (e.g. through Jenkins or similar tools).

• Familiarity with AI-assisted testing tools for test case generation, defect prediction or test data management is a plus.

• Good communication skills in English, with the ability to collaborate effectively with remote stakeholders and clearly articulate quality risks and test outcomes.

• Attention to detail, analytical mindset and a systematic approach to quality.

Apply by submitting a CV in English.