Skill set
Additional skills (25)
Industry fields of expertise
Sébastien in a few words
Looking for a React / Next JS frontend developer?
You're in the right place.
I am a software engineer with over 5 years of experience and a React / Next JS development specialist.
I have worked in the automotive, telecommunications, and public service sectors...
I have collaborated with companies like Groupe Rapido, Vodafone Ziggo, and ANCT.
I have certifications in continuous delivery and deployment pipeline anatomy, as well as in AWS, Next.js, and Nest.js.
As a front-end web developer, I can assist you with:
- Your website
- Web application development
- Website development
- Implementing accessibility
- Website redesign
- Front-end migration
- Setting up continuous integration and continuous deployment (CI/CD)
- Training and skill development for development teams
I am committed to developing scalable applications while respecting budgets.
I pledge to:
- Develop high-value features as early as possible
- Deliver new usable features every day
- Keep the application in a constant operational state (bug-free)
I also place great importance on transparency with my clients.
I send them a daily report at the end of the day covering all the tasks I have completed.
Do you have a project? Contact me. I respond within 24 hours.
Technical environment: React.js, Node.js, Typescript, Next.js, Express.js, Nest.js, REST, GraphQL, RPC, RPC (tRPC), Vitest, Jest, Testing Library, Playwright, internationalization (i18), accessibility (a11y), Docker, Kubernetes, Continuous Delivery, Trunk Based Development, Test Driven Development (TDD), Agile Manifesto, Kanban, PandaCSS, Tailwind CSS, React Native, Expo, Storybook, Chromatic, Gherkin, Cucumber, Gitlab CI, Gitlab Runner, Git, Github, WebSocket, MQTT, Amazon Web Services, Redux, Zustand, Jotai
Experience
- TortugaReact Native & Node.js Next.js / React.js DeveloperSPORTSOctober 2024 - Today (7 months)Toulouse, FranceTortuga was founded in 2024 by Corentin Teulet, a full-stack developer from the Toulouse region.Passionate about mountain sports, he realized that there was no dedicated space where mountain sports and outdoor enthusiasts could meet and share their passion.So he created Tortuga with the mission of fostering human connections, making the mountains accessible, inspiring and being inspired, sharing his passion for the mountains and enriching it.I joined Tortuga as technical co-founder alongside Corentin.I carried out the following tasks:- Design of the roadmap of functionalities to be developed and their prioritization using a Kanban board, based on Agile, Lean and No Estimates principles.- Technological and architectural choices, mentoring and training of developers, including interns- Front-end development of web and mobile applications with Next.js, Tailwind CSS, HeroUI/NextUI, React Native, Expo, Native Wind, TypeScript, Jotai and Tanstack Query- Back-end application development, including secure React Server Functions and REST API and RPC endpoints, communicating with the database in Next.js, Supabase, React, TypeScript, Node.js, JWT, Supabase and PostgreSQL- Development of real-time functionalities with Supabase and the WebSocket publish/subscribe protocol- Implement continuous delivery in our working practices (DevOps, Trunk Based Development, CI/CD, Observability) to ensure product stability and scalability while optimizing our resources.During this experience, Tortuga's numbers evolved as follows:- More than 600 users within 3 monthsLink to Tortuga website: https://tortuga.ovh/
- ANCTerritoiresNode.js Next / React.js developerPUBLIC SECTORFebruary 2024 - February 2025 (1 year and 1 month)Paris, FranceThe ANCT is a French public organization. It supports local authorities in their territorial challenges. The agency has 3,000 employees. It is recognized throughout Europe as a model of administrative innovation. It is affiliated with beta.gouv.fr (a program dedicated to incubating digital public services).The ANCT is developing La Suite Territoriale, a digital platform. It is designed in partnership with ANSSI and DiNum as part of the France 2030 Plan. It aims to strengthen cybersecurity for local authorities. It represents a major advancement in local digital sovereignty.The Suite offers three essential and secure tools for local authorities:- protected domain names- professional messaging- online storage spaceThese services are open source, interoperable, and hosted in France.My team consisted of:- 1 project manager- 1 UI/UX designer and Product Owner- 2 Python/Django developers- 2 React.js/Node.js/Next.js/Typescript developers- 2 deployment officersAs a Node.js React.js developer, my responsibilities were to:- Develop a tRPC API using Typescript, Node.js, Koa.js- Create interactive components and pages in TSX with React.js, Next.js, and Typescript- Implement unit and end-to-end tests with Jest, Vitest, and Playwright- Write technical documentation on Storybook and Outline in markdown- Configure the application's internationalization in English and French with react-i18nextI contributed to the following developments:- The development of an administration console ready to receive beta testers in 6 months- Access to new fundingHere is the link to the project website: https://github.com/suitenumerique/people
- Groupe RapidoNode.js Next.js / React.js DeveloperAUTOMOBILESeptember 2021 - December 2024 (3 years and 4 months)Mayenne, FranceGroupe Rapido is a leader in Europe for recreational vehicles. This company combines innovation and French expertise. It has 1,500 employees. The group produces caravans, motorhomes, and mobile homes. Founded in 1961 in Mayenne, it operates in more than 20 countries. Its market extends to North America. It markets brands such as Itinéo, Westfalia, and Dreamer.In 2021, it launched weekandgo.com. This marketplace allows 31 partner dealers to sell their vehicles online. It also enables individuals to publish their listings.My team consisted of:- a React.js Node.js Next.js developer- a PHP/API-Platform developer- a web integrator and UI/UX designer- a project manager- a digital marketerAs a Next.js Node.js React.js developer and technical lead, my responsibilities were:- Developing UI components with React.js, Next.js, JSX, MaterialUI/MUI- Developing SQL data models, REST endpoints in Node.js, Strapi CMS, PHP 7, and API Platform- Selecting technologies- Supporting developers to improve their skills- Setting up DevOps CI/CD workflows with Docker, Gitlab CI and Gitlab Runner, Docker, Jest, Playwright- Developing regression prevention tests (unit tests with Jest, rendering/component tests with Testing Library, visual tests with Chromatic, end-to-end tests with Playwright)- Writing technical documentation with Markdown, Storybook, and JSDoc- Designing features as a team- Prioritizing features for development to respect budgetsI contributed to the following developments:- Generating an annual turnover of €50k from 2022 to 2024- 3 million annual unique visits to the siteHere is the link to my client's website: https://www.corporate-rapido.com/
2 recommendations
CT
LA
Corentin Teulet and 1 other person have recommended Sébastien
08/03/2025
Working with Sébastien on Tortuga has been an absolute pleasure. Not only is he a highly skilled technical expert, but he also brings a strategic vision that goes far beyond the purely technical aspects of a product. His ability to understand broader challenges—whether related to user experience, business strategy, or long-term scalability—makes him an invaluable asset to any project.
Tortuga wouldn’t be what it is today without his help. His problem-solving mindset, dedication, and ability to think ahead have significantly shaped the platform. If you’re looking for someone who combines deep technical expertise with a clear understanding of product goals, Sébastien is the person you need.
Tortuga wouldn’t be what it is today without his help. His problem-solving mindset, dedication, and ability to think ahead have significantly shaped the platform. If you’re looking for someone who combines deep technical expertise with a clear understanding of product goals, Sébastien is the person you need.
06/03/2025
I worked with Sébastien as part of his freelance activity.
He is serious and very involved in his career and has very advanced technical skills.
I recommend!
He is serious and very involved in his career and has very advanced technical skills.
I recommend!
Education
- Bachelor's degree, Logiciels et applications multimédiaMyDigitalSchool Paris2020Bachelor's degree, Logiciels et applications multimédia
- Certificat de fin de formation, Technologies de l'informationUdemy Alumni2020Certificat de fin de formation, Technologies de l'information
- Certificat de fin de formation, Gestion de projets en technologies de l'informationUdemy Alumni2020Certificat de fin de formation, Gestion de projets en technologies de l'information
- Certificat de fin de formation, Technologie informatique / technologie des systèmes informatiquesUdemy Alumni2020Certificat de fin de formation, Technologie informatique / technologie des systèmes informatiques
- Certificat de fin de formation, Technologie informatique / technologie des systèmes informatiquesUdemy Alumni2020Certificat de fin de formation, Technologie informatique / technologie des systèmes informatiques
Certifications
- The Anatomy of a Deployment PipelineCD Training DevOps Courses from David Farley2024
- Develop full-stack JavaScript applications with Next.js and React.jsBelieveMy2021
- AWS Cloud – The 12 Fundamental ServicesUdemy2020
- NestJS & TypeScript – Zero to HeroUdemy2020
- Serverless Framework – Build and Deploy ApplicationsUdemy2020