Freelancer profile translated to English.
Back to original languageAbout Arnaud
Full-stack software engineer with over 5 years of experience, specializing in Python, backend architecture, and cloud DevOps. I help companies design and deploy robust and scalable platforms.
Graduated from the École Nationale Supérieure des Mines de Saint-Étienne after preparatory classes at Lycée Chateaubriand, I have developed solid technical expertise combined with a pragmatic, product-oriented approach.
I worked for 4 years at RIMES Technologies, a company specializing in financial data management, where I held a full-stack developer position on critical data processing systems.
More recently, at Cyber Guru / Mantra (cybersecurity company), I designed and developed a platform for distributing cybersecurity video training. I created the project from scratch: microservices architecture (DDD), Python backend APIs (FastAPI), cloud infrastructure on GCP, queue and scheduling systems, database synchronization, email notifications, and load testing to ensure scalability. I also developed a frontend interface integrated into the main application, collaborated with product and sales teams, and mentored two junior developers.
Key skills: Python, FastAPI, API design, microservices, message queues (RabbitMQ), GCP / AWS / Azure, Docker, CI/CD (Jenkins, Azure Pipelines), testing (pytest), monitoring and performance.
Outside of development, I enjoy climbing, trail running, running, and mountaineering. I also play guitar and chess on Chess.com. I am returning from a year-long trip around the world, a very enriching personal experience.
French
Native or bilingual
English
Native or bilingual
Spanish
Conversational
Can work on-site
Paris (up to 50km)
Experience
- MantraFull Stack DeveloperOctober 2024 - February 2026 (1 year and 4 months)Paris, FranceAt Mantra / Cyber Guru, I initially joined the phishing simulation and security awareness team, where I developed chatbot-based training systems integrated with Microsoft Teams and Slack, while contributing to the administrator-facing frontend.Following the merger between Cyber Guru and Mantra, we decided to integrate Cyber Guru’s cybersecurity awareness video courses into Mantra’s existing platform. This was a key strategic initiative, as it enabled Mantra to offer an entirely new product line while preparing for the future migration of Cyber Guru’s users.Because Mantra already had a large customer base, the solution needed to be robust, scalable, and able to support large onboarding waves and cross-selling without disruption.I created the project from scratch, designed and implemented multiple microservices and APIs, managed DevOps infrastructure on GCP, set up queues and schedulers, and developed a new frontend page within the main application. The technical challenge was significant, as early architectural decisions had to be right to avoid costly rework. I applied domain-driven design principles, followed modern FastAPI standards, ensured all code was production-ready and tested, and conducted stress testing to guarantee scalability.Among other components, I built a database synchronization service, email notification systems for new course releases, release schedulers, and authentication and impersonation mechanisms for the frontend.Beyond the technical work, I collaborated closely with the sales team to understand market needs, worked with product managers to define priorities, and managed two junior developers throughout the project.Although intense, this project was extremely rewarding. I am particularly proud that my work helped raise cybersecurity awareness among a wider audience and contributed to reducing security risks for users.
- RIMES TechnologiesFull Stack DeveloperOctober 2019 - June 2023 (3 years and 8 months)Île-de-France, FranceI worked on various projects in the R&D department as a Full Stack developer.I created a visualization tool for financial assets and their data deliveries to clients, integrated with a complex existing data delivery system. The architecture utilized APIs, messaging queues, database layers, and cloud indexes.I developed visualization features for complex investment structures, leveraging graph databases on top of a microservices architecture.I applied best practices for delivery, including unit testing, pre-production testing, functional testing, and continuous integration. Additionally, I utilized Agile methodologies such as Scrum and Sprints to enhance efficiency.Additionally, I developed a new continuous integration system with Jenkins and worked on DevOps projects, such as creating a process to configure and install new pre-production servers for testing.
- RIMES TechnologiesFull-stack Developer InternApril 2019 - September 2019 (5 months)Île-de-France, FranceHelp in the creation of a Web Monitoring tool for customers in the financial sector. I mostly worked with ReactJS and Redux on this application. I also worked on a feed monitoring application created with Windows Presentation Foundation (WPF).
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Education
- Engineering Degree, Computer EngineeringEcole nationale supérieure des Mines de Saint-Etienne2019Diplôme d'ingénieur, Ingénierie informatique
- Robotics systems, computer scienceTOHOKU UNIVERSITY2017Robotics systems, computer science