Custom development

Adapted to your company

We design and develop your custom business application. With the ability to propose proprietary and open source solutions, our teams have developed business expertise that allows us to effectively direct our responses to propose high value-added IT solutions.

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Pivot-A propos-Castelis

Development and advice

Digital innovative solutions

We design innovative digital solutions for industrial and tertiary clients, adapted to the needs of each market and organization. As a devops operator, our ability to carry out end-to-end projects, both in France and internationally, enables us to support your digital transformation over the long term.

Our objective is to adapt to the existing technical environment in order to propose sustainable solutions for our customers.

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The best open-source technologies

to meet your company needs

The technical team is involved from the pre-sales stage, and then in the project vision phase. This is essential for a good understanding of the needs and challenges of projects. No silos in our teams.

Relying on the richness of the open-source ecosystem, our engineers recommend the best solutions by explaining their advantages and disadvantages, and offer you a detailed costing. You thus become an actor of the technological choices that will accompany your company for several years.

For web services, our developers are specialized in the PHP language via the Symfony framework.

For mobile services, we have for developers specialized on native technologies, Swift (iOS) and Kotlin (Android), and on hybrid technologies, React Native.

Our technologies

We are always looking for the best Open Source technologies.



An open source PHP framework for creating web applications, APIs, and web services.



An open source web application for creating online stores.



An Open Source website creation tool, written in PHP with a simple and intuitive content management system.



An Open Source framework written in JavaScript for creating web applications.



An Open Source JavaScript library developed by Facebook to facilitate the creation of web applications.



A dynamic language for creating CSS cascading style sheets.

Web pack

Web pack

An Open Source JavaScript module bundler, with the ability to create static assets representing these modules.



A programming language created by Apple to develop iOS and Mac apps.


A mobile operating system developed by Google for smartphones, tablets, connected objects and computers.


Cloud computing services developed by Microsoft to create highly secure cloud solutions.


CRM platform with all the necessary tools for marketing, sales, customer service and content management.

Our expertises

Business applications

Development, implementation and maintenance of business applications with different technologies

Intranet and Extranet

Development of your intranet / extranet adapted to your objectives (users & employees)


Improve your website governance, reduce costs with Sitecore technology


Mobile applications development on different technologies (IOS, Android...)

Corporate websites

Corporate websites, UX and UI, design & ergonomics, in accordance with your objectives

E-commerce and B2C

Development and redesign of websites, improvement of the experience of your visitors on your site

They have chosen our digital know-how

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