Freelancer profile translated to English.
Back to original languageAbout Sullivan
Full Stack Developer since 2016, I specialize in the design and development of websites, SaaS platforms, custom CRM solutions, and native mobile applications.
My expertise is primarily based on the JavaScript / TypeScript ecosystem, which I use to create high-performance web, mobile web, and application solutions.
I support my clients throughout the entire creation cycle:
UX/UI, front-end development (React.js), back-end (Node.js / MySQL), as well as mobile (React Native).
This global vision allows me to design coherent, scalable products that are perfectly adapted to operational needs.
Typical Projects
Websites
SaaS Platforms
Custom CRM / ERP
APIs and microservices
Native mobile applications
Technologies
HTML / CSS / JS
Node.js (TypeScript)
React.js (TS/TSX)
MySQL
Digital Project Manager
In parallel with development, I also provide all the necessary technical documentation: functional specifications, architecture diagrams, APIs, workflows, and decision-making aids for management or technical teams.
What sets me apart
I distinguish myself through a technical approach inspired by the mobile world, focused on reliability, data consistency, and reducing network dependencies. Projects whose architecture I master fully benefit from this.
Thanks to this common standard, interfaces (web, mobile, desktop) can perform some validations without waiting for the server, reducing latency and unnecessary calls.
Key Benefits
Less latency: interfaces perform simple validations immediately, before any backend request.
Fewer errors: data is normalized and consistent across services.
Increased resilience:
in case of hosting provider failure, a continuity relay can receive requests, interact with front-end applications, and ensure zero data loss, while verifying the validity of actions.
English
Native or bilingual
French
Native or bilingual
Can work on-site
Lyon (up to 20km), Le Puy-en-Velay (up to 50km), Saint-Étienne (up to 50km), Paris (up to 20km)
Experience
- MESDEVELOPPEURS
On Malt
HTML/CSS IntegrationAugust 2021 - August 2021Simple HTML/CSS integration of a mockup provided by the client. With a few lines of JS to animate the links of the single page. - SFIRWebsite and Tool CreationE-COMMERCEDecember 2013 - Today (12 years and 6 months)Le Puy-en-Velay, FranceFounded in 2013 with the goal of creating websites, SFIR has gradually evolved towards developing business management tools. Our objective: to offer not only high-performance websites but also integrated digital solutions that truly meet our clients' operational needs.Today, we design websites with optimized user experiences, connected to custom tools: platforms, back-offices, business modules, or targeted functions based on each company's needs.Not everyone needs a complete system: some projects require a robust platform, others just a few specific components. This flexibility is at the heart of our approach.We are also capable of replicating our model on a smaller scale for external clients, by implementing personalized solutions to optimize their production and centralize their processes.
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