Gregoire Yharrassarry

Context: The key role of a Market Analyst at Euronext is to ensure rigorous monitoring of the trading floor. I specialized in overseeing derivatives and commodities, as well as improving market surveillance processes. Additionally, in 2022, following the acquisition of Borsa Italiana, Euronext decided to migrate its Data Center from Basildon to Bergamo, Italy, to strengthen its relationship with the Italian stock exchange. During this migration, I was responsible for creating all possible test cases to ensure API service continuity for our clients. Responsibilities: • Coordinating client integration into the new data system. • Overseeing client integration during the Data Center migration while ensuring compliance with MiFID II reporting obligations. • Creating and maintaining the test matrix to validate post-migration functionalities. • Analyze client behavior and implement corrective measures in line with MAR requirements. • Designing test pipelines for new features. • Conducting risk analysis and developing mitigation plans. • Creating test scenarios compliant with MiFID II regulations. • Establishing functional validation procedures. • Providing production support. • Leading testing sessions with clients to ensure system reliability. • Reporting on system performance. • Developing Python dashboards to track client behavior and detect algorithmic flaws. • Creating Power BI dashboards for random alert analysis in internal audits. Technical Environment: • Tech Stack: Power BI, Python, Excel. • Daily Tools: Resilience, Matrix, Centriq, Horizon, Cisco.

Context: At Euronext Technologies, our trading algorithm testing platform was slow and unreliable. It became necessary to develop a new, faster testing platform capable of correcting the shortcomings of the previous system. Responsibilities: • Full-stack development of a trading algorithm testing platform. • Development of RESTful API endpoints. • Optimization of testing performance, achieving a 75% improvement. • Participating in code reviews and drafting technical specifications. • Engaging in sprint planning and analyzing user requirements. • Integrating client feedback into development cycles. • Developing a Python algorithm that generates React applications from XML files. • Improving test pipeline execution speed and reliability, achieving a 100% success rate. Technical Environment: • Tech Stack: AngularJS, Spring Boot, AWS, MySQL, Kafka, TypeScript, Python. • Daily Tools: Microsoft Teams, Vim, IntelliJ, Postman, Jira.