Léo Mieulet

Technical lead of REGARDS; an open-source software to perennialize and valorize space data - Analysis of complex modifications to the existing architecture to propose appropriate solutions - Reviewed all Pull Requests prior to code integration into stable branches, ensuring high standards of quality and reliability - Improved code quality and design standards to accommodate increased data volume and ensure system stability - Training and support for team members - Providing technical expertise on the technologies and tools used in the project - Participate on the response to the CNES HYSOPE-2 (SWOT) tender for a hydrological data dissemination platform

Developed an Ansible playbook to install and configure a Docker Swarm cluster along with associated software: - Designed for high adaptability to performance requirements, ensuring backward compatibility and cross-platform support (Red Hat 7/8, CentOS, Debian). - Created open-source documentation used by multiple development teams, enabling them to deploy their own instances independently. - Configured monitoring and log management systems to ensure the health and stability of applications and servers using Prometheus, Loki and Grafana. - Implemented security best practices, including data encryption, SSL, compliance with CIS Docker Benchmark and COTS recommendation. - Deployed and configured cluster environments with software such as Elasticsearch, RabbitMQ, Prometheus, Loki, Grafana, Kafka, Fluentbit, Fluentd... - Analyzed and resolved performance issues in systems and applications, optimizing configurations to enhance efficiency (DNS flooding, PostgreSQL index corruption..). Enhanced CI/CD pipelines to enable rapid and reliable software iterations. Technologies used: Ansible, Bash, Docker, Git, Swarm, Kubernetes (K8s), Jenkins, Nexus, Clustering, Elasticsearch, RabbitMQ, Grafana, and more.

Development and Maintenance of Java Spring Cloud Microservices - Designed and implemented REST/AMQP APIs and data processing algorithms, optimizing for horizontal scalability with service replication. - Analyzed and corrected complex algorithms in multi-threaded and multi-instance environments, ensuring robust and reliable performance - Enhanced SQL queries executed by services to minimize footprint and improve response times - Resolved unstable integration tests, ensuring a stable and reliable Continuous Integration (CI) pipeline - Developed OpenAPI documentation for microservices, enabling automated code generation for Cucumber (E2E tests), frontend clients (Javascript), and comprehensive open-source documentation with Docusaurus Technologies used: Java 17, Spring boot / Spring cloud / Sping cloud stream, Postgres, Hibernete, RabbitMQ, ElasticSearch, Maven, Intellij

Developed a modular application delivering a highly configurable solution with features such as lazy loading, infinite scrolling tables, granular access controls, responsive design, and map visualization: - Ensured the maintainability and scalability of the application codebase. - Managed the full development lifecycle, from gathering user requirements and creating low-fidelity prototypes to feature analysis, cost estimation, and implementation. - Conducted training sessions for colleagues on WebApp development best practices. - Upgraded JavaScript dependencies to their latest versions to keep the project modern, maintainable, and to prevent major breaking changes over time. Technologies used: React, Webpack, Redux, Material-UI, Lodash, TypeScript, Cesium, Babel, Docusaurus, and more.

Development of a tool in order to edit operational databases used by MAESTRO for flights management. Specification, design, development of web-services, integration and validation. Technologies : Javascript (front), Node.js, MongoDB, HTML5, CSS3, SQLite Libraries: Bootstrap, OpenLayers, JQuery Framework: Meteor.js