# Custom Web & Software Development in Europe | SDX > Custom websites, SaaS, MVPs and business software for European and international teams. Work directly with a senior developer based in France. Websites · SaaS & MVPs · Business software · AI ## Custom websites, SaaS & business software for European and international teams SDX Development builds professional websites, SaaS products and custom business software for companies across Europe and international markets. Based in France and working remotely, each project starts with a concrete business goal: generate qualified enquiries, launch a digital product or simplify internal operations. [Discuss your project](https://sdx-development.com/en/contact)[Explore case studies](https://sdx-development.com/en/case-studies) - Since 2013 - Full-stack - Business applications - AI & RAG Web development & business tools ## A useful website today. A solid foundation for tomorrow. Present your business, generate enquiries, centralise data or automate a process: the project starts with your objective, then brings together the content, interface and technology needed to achieve it. 1. 01 **Define the need** Audience, goals, content, users and real constraints. 2. 02 **Build the right solution** A website, redesign, web application or business tool. 3. 03 **Keep improving** A manageable, maintainable foundation that can grow. ## Four ways to move your business forward. WEB ### Professional website development Credible business websites, catalogues and e-commerce, with manageable content and a structure that makes your offer clear. [Explore custom web development →](https://sdx-development.com/en/custom-web-development) SaaS ### Custom SaaS & MVP development Online products with accounts, roles, subscriptions, APIs and a core workflow designed to test demand and develop the market. [Explore SaaS & MVP development →](https://sdx-development.com/en/saas-mvp-development) APP ### Custom business software Management tools, extranets and web applications that connect your users, data and internal processes. [Explore business software →](https://sdx-development.com/en/custom-business-software) UP ### Website redesign & improvement Modernise an existing website while reviewing useful content, search visibility, performance and security. [Plan a website redesign →](https://sdx-development.com/en/website-redesign) ## Products built around real work. Business software ### Idea to Software A business ERP connecting jobs, constraint-based scheduling, stock, invoicing and a customer extranet, with ITS Report for video inspection. - [Explore the case study →](https://sdx-development.com/en/case-studies/idea-to-software) - [Explore the platform ↗](https://www.idea-to-software.com/) Operational supervision ### RATP Toilettes Connectées An IoT supervision platform connecting equipment, operational incident reports, commands and resolution tracking. - [See the project context →](https://sdx-development.com/en/about) [Explore the project →](https://sdx-development.com/en/case-studies/operational-dashboards) Industrial website ### Résiliner An industrial website with a custom CMS: technical content, the C.A.R.E. method, project references, franchise information and diagnostic enquiries. - [Explore the case study →](https://sdx-development.com/en/case-studies/resiliner) - [Visit Résiliner ↗](https://resiliner.groupe-we.com/) One direct technical contact ## From a business website to a working software product, with continuity at every step. Since 2013, Sébastien Descloux has designed websites, interfaces and software for real working environments. Based in France, I work with European and international teams through remote workshops, regular demonstrations and written decisions, from discovery to launch and further development. - **A clearly explained solution**Understand the intended use before discussing the technology. - **Content your team can manage**Update the agreed content areas through the CMS without commissioning every routine change. - **SEO & performance**Technical SEO, mobile layouts and page speed are part of the foundation. - **Room to develop**APIs, customer areas, automation or AI can extend the product when a concrete need justifies them. Budgets & timescales ## Clear price ranges before a detailed project scope. Business websites, catalogues, e-commerce and SaaS: review indicative budgets and the main cost factors. Quotes are in euros; hosting, third-party services and maintenance are identified separately so you can plan the full investment. [View pricing](https://sdx-development.com/en/pricing) - [PHP2Shell: Two Critical PHP Vulnerabilities, Risks and Fixes](https://sdx-development.com/en/news/web-cybersecurity/two-critical-php-vulnerabilities-risks-and-fixes) — PHP2Shell: Learn about vulnerabilities CVE-2026-109618 and CVE-2026-109619, vulnerable PHP versions, and urgent measures to secure your websites and applications. - [GitHub AI Scan now detects PHP vulnerabilities in pull requests: should you add it to your CI/CD?](https://sdx-development.com/en/news/ai-cybersecurity/github-ai-scan-php-security-pull-requests-cicd) — GitHub AI Scan now supports PHP: how it works, its limitations and cost, Symfony and WordPress examples, and how to integrate it into a secure CI/CD pipeline. - [Astro 7.4: Measure and Speed Up Your Website Builds](https://sdx-development.com/en/news/web-development/timings-optimize-site-generation) — Astro 7.4: discover astro build --timings to analyze slowdowns, speed up your builds, and test experimental parallel prerendering without misleading benchmarks. ## A website to create, a workflow to simplify or a product to improve? Based in France, I support European and international businesses remotely. Share your activity, goal, timeframe and team location so we can arrange a useful first discussion. [Discuss your project](https://sdx-development.com/en/contact)[View pricing](https://sdx-development.com/en/pricing) --- [View the HTML page](https://sdx-development.com/en)