Sébastien TETARD

I lead the technical teams while remaining deeply hands-on in the development of both the APIs and the mobile application. I work closely with engineers on architecture, implementation, and deployment, ensuring high standards of performance, reliability, and scalability. I have strong expertise in handling sensitive technical and regulatory challenges, particularly around HDS (Health Data Hosting) certification requirements. I am also highly involved in securing infrastructure end-to-end, including data protection, access control, compliance, and best practices in cloud and system security. More broadly, I ensure that all technical decisions align with both product goals and strict healthcare compliance standards, while maintaining a pragmatic and execution-focused approach. Python Fast API, Gcloud, Docker, Postgres, Redis, Biquery, LLM, Expo React, Next JS

Daitor is a French company specializing in visual recommendation technology. It leverages artificial intelligence to analyze product images and automatically suggest visually similar items, helping e-commerce businesses increase sales and enhance the overall shopping experience. The platform is built around a proprietary computer vision algorithm that performs visual recognition on product catalogs and interfaces. It identifies visual patterns and extracts actionable features to optimize e-commerce performance and conversion rates. Key responsibilities and contributions include: • Development of a machine learning algorithm based on visual analysis of e-commerce interfaces and product catalogs • End-to-end product ownership, including design, development, and deployment • Design and development of a SaaS platform focused on e-commerce conversion optimization • Development of a client-side JavaScript SDK delivered via CDN for seamless integration • Shopify integration through a dedicated app and dynamic script injection • Design of a high-performance, scalable front-end and back-end architecture Python Fast API, AI, Qdrant, Gcloud, Docker, Postgres, Redis, Biquery, LLM, React JS

Artsper is a start-up that connects contemporary art galleries with art lovers. Founded in 2013, Artsper has established itself as the number one marketplace in France for the online sale of artworks. Our vision is to democratize contemporary art by making it accessible to everyone. • Recruitment and management of a multidisciplinary team (11 people). • Refactoring strategy and technical debt management. • Internationalization of the marketplace (4 languages, 110 countries). • Design of a hybrid infrastructure (bare metal + cloud) to handle traffic spikes while optimizing costs. • Implementation of project management processes, HR rituals, and team facilitation. • Collaboration with the Head of Product on strategy and technical roadmap. • Migration of the widewalls.ch marketplace. Symfony, React.js, Python, AWS Lambda serverless, Node.js, Angular, MongoDB, Docker, Bigquery, MySQL, PHP, Gcloud, SEO

We created Reepeat to enable you to find an alternative to new products for all your needs and for all the brands you love. From high-tech products to childcare items, including sports equipment, Reepeat selects refurbished offers from the biggest brands and leading retailers. • Design and deployment of the technical architecture. • Project management and technical leadership. • Integration of cloud solutions and microservices management. AWS, Symfony, PHP, Pyhton, Redis, Typesense, MongoDB, serverless, SEO

Consultant for the company Keyrium. • Analysis of existing systems and preparation of expert assessment reports for incoming projects • Gathering requirements defined by the project owner (business stakeholders) • Writing general functional specifications • Creation of user stories and project wireframes/zoning • Implementation of development reporting • Writing test plans and acceptance test documentation • Estimation of new features requested by the project owner • Coordination of technical teams and monitoring the development of new features defined by the business stakeholders

BACK-END DEVELOPER – WEME • Implementation of a server-side MVC architecture integrating the Smarty template engine for page rendering. • Installation of libraries enabling PDF-to-JPEG generation and indexing of textual content in the database (Text Extraction Toolkit). • Design and development of externalized Jabber and BOSH web services to build an embedded real-time messaging (RTM) system using XMPP technology. • Creation and optimization of complex MySQL queries for data display on the platform. • Writing of technical documentation and platform procedures. BACK-END DEVELOPER – ORANGE CONVENTION 2012 WEB APPLICATION • Collection of client-defined requirements. • Design of the data model (conceptual data model – CDM). • Design and development of the PHP 5 technical environment. • Front-end integration using responsive mobile technologies, with data querying via Ajax and JSON.• • Integration of a video player using the HTTP protocol to manage pseudo-streaming compatible with iOS. • Integration of an embedded RTM module using Ajax, XML, and JSON technologies for data exchange. • Research and development of touch-based technology for photo gallery manipulation on smartphones.

Clicpostal is an online greeting card company specializing in the sale of birth announcements and various other products such as photo calendars, photo albums, bookmarks, and more. • Gathering requirements expressed by the marketing teams. • Showcasing the brand’s different products through presentation pages and intuitive, user-friendly customer journeys using Ajax, jQuery, and HTML5 technologies. • Integration and distribution of promotional newsletters in HTML and CSS (approximately 80,000 prospects). • Development and deployment of PHP scripts to significantly optimize product production and management (Back Office search module, newsletter template generator). • Research and development of a PHP algorithm using the GD Image library to classify products by color. • Creation, integration, and development of the blog http://www.clicpostal.com/blog/ using WordPress.

• Gathering requirements expressed by the marketing teams. • Creation of graphic design guidelines. • Design and HTML/CSS integration of various content pages for the websites www.transatel.com and www.eurokeitai.com •Design and integration of newsletters.