AI designed for your business processes, not the other way around

Castelis takes your AI from prototype to production: business apps, AI agents, and data platforms that actually work at scale. One partner, from strategy to execution.

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+500 projects delivered

Since 1999, in France and internationally

+5 business sectors

Dev, cyber, cloud, data and UX under one roof

Certified security

ISO 27001:2022, GDPR and CyberVadis Platinum Medal 2025

# They chose our expertise

/ Our Clients

# Our Expertise

/ From concept to production

A single partner to move from use case to a production-ready product with measurable results, controlled compliance and optimised costs.

Custom Development

Websites, business applications, ERP and mobile. Solutions that integrate into your processes and evolve with your business needs.

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Cybersecurity

Governance, technical security, detection and response. ISO 27001:2022 certified, GDPR compliant and CyberVadis Platinum 2025 recognised.

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Cloud Infrastructure

Cloud migration, managed services and optimisation, with 24/7 monitoring, guaranteed SLAs and data hosted in France.

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Data & AI

Data pipelines, AI agents and MLOps. From architecture to industrialisation, for use cases with measurable impact on your business.

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Your challenges, our methodologies

Migrate or optimise your Cloud

Reduce costs and gain agility with a cloud infrastructure tailored to your needs.

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Secure & monitor your IS

Protect your systems, anticipate incidents and stay in control of your IT security.

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Leverage Data & AI

Transform your data into performance drivers with operational AI solutions.

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Build or optimise a business application

Tools that adapt to your business processes and evolve with your needs.

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Build or optimise a website

An online presence that drives traffic, engages your visitors and converts.

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Successfully navigate e-invoicing reform

Anticipate the legal requirement and implement a compliant solution without business disruption.

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# OUR APPROACH

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An integrated approach, from scoping to operations

Castelis is involved throughout the entire lifecycle of your digital projects: design, development, security and optimisation. Every project is scoped, managed and delivered with rigour, by multidisciplinary teams engaged from start to finish.

Deadlines met, budgets controlled
Teams dedicated to your context
A single point of contact from design to operations

Talk to an expert

An integrated approach, from scoping to operations

+500

Projects delivered

Since 1999

24/7

Run & SOC

Continuous monitoring

≥99,9%

Guaranteed SLA

High availability

Business sectors

Multi-industry

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Dedicated experts at every stage of your project

250 professionals with complementary profiles: developers, cloud architects, cyber experts, data scientists and designers, who share a common commitment: understanding your context before delivering. Each engagement is led by experienced professionals, involved from design through to operations.

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Dedicated experts at every stage of your project

# PARTNERS

/ An ecosystem to go further, faster

We work with recognised ecosystems to build solid solutions: CMS/DXP, cloud tools, data platforms and collaborative services. These partnerships accelerate your projects, secure integrations and simplify governance. You benefit from proven best practices, modern tools and lasting support to evolve your product.