Lenny G.

At Polyconseil, I worked as a full-stack developer on a large-scale project for Hachette Livre, focusing on mainframe code analysis and visualization. I designed and built features for the web application (React, TypeScript, MUI) and contributed to the backend (Node.js, Express, Prisma, PostgreSQL). My work involved creating interactive graphs and dashboards to explore job flows, implementing APIs, and optimizing data models for performance. I also integrated authentication and group-based authorization (SAML SSO, JWT), and collaborated on AI-powered analysis pipelines using Gemini and Anthropic models. This experience allowed me to deepen my expertise in scalable architectures, DevOps practices, and close collaboration with product and technical stakeholders in an agile environment.

At Racemappr, I had the opportunity to work in a dynamic startup environment focused on data and mapping. I contributed to both the mobile and web applications, developing features with TypeScript/React, setting up and optimizing APIs, and integrating geospatial databases. I also worked on data analysis and structuring to improve the accuracy and performance of the platform. This role allowed me to strengthen my expertise in software architecture and full-stack development, while collaborating in an agile environment. By working closely with the product and technical teams, I helped define priorities and deliver impactful solutions. Overall, this experience gave me solid, hands-on skills in addressing data-driven and mapping challenges.

At Feelbat, I worked as a full-stack developer with a strong focus on the mobile application. I contributed to building and improving features using React Native, while also supporting the backend with Node.js, Express, and PostgreSQL. My role included implementing intuitive mobile interfaces, ensuring smooth API integration, and optimizing performance for a seamless user experience. On the backend side, I worked on designing endpoints, managing data models, and maintaining reliability across the system. This experience allowed me to strengthen my expertise in mobile-first development while still contributing across the full stack, and to collaborate closely with the product team in an agile environment.