IT outsourcing: managed services, performance and cloud governance
Outsource the operation, performance and governance of your cloud and on-premise infrastructures. From managed services with 24/7 on-call cover to FinOps cost control, through application performance audits and cloud compliance, Castelis covers the full lifecycle of your environments.
Certified multi-cloud
SLAs and 24/7 monitoring
FinOps and compliance
/ Our Clients
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What is IT outsourcing?
Outsourcing your IT means entrusting all or part of the management of your information system to a provider. The term covers very different realities, which is what makes the decision hard to frame. Two scopes stand out:
- Full outsourcing: the entire infrastructure entrusted to a single partner, with service commitments
- Partial outsourcing: only monitoring, night-time on-call cover or one specific environment are delegated
- A choice driven by what your teams already do well, not by the size of your company
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Why outsource your IT infrastructure
Our teams operate your cloud and on-premise environments with clear SLAs and management based on measurable indicators.
The three benefits our clients mention most often: incidents handled without tying up their teams, a finally clear view of what their infrastructure costs, and the ability to pass an audit without improvising.
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Cloud and on-premise managed services, 24/7
Outsource your infrastructure operations to experts committed to clear SLAs, with cover ranging from business hours to 24/7 on-call.
- Monitoring and service levels
- Incident management and patching
- Backup and disaster recovery
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Cloud governance and compliance
Structure the rules, roles and controls of your cloud environments, so your practices stand up to audit against GDPR, ISO 27001 and NIS2 requirements.
- Cloud governance and audit
- GDPR and ISO 27001 compliance
- Technical documentation
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Web and application performance audit
Measure and optimise the performance of your applications and websites: we identify what actually slows them down, then we fix it.
- Audits and load testing
- Manual and automated QA
- Application monitoring and logs
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FinOps consulting: cloud cost management
Manage your cloud spending transparently across Azure, AWS and Google Cloud, by aligning finance, IT and business teams.
- Cost audit and optimisation
- Cost allocation and showback by team
- FinOps governance
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What should you outsource, and how far?
We do not sell a standard scope: the initial scoping sets out what stays with you, what we take on, and how reversibility is organised. Three questions are enough to point you in the right direction:
- What wakes your teams up at night? If on-call duty rests on two people, start with monitoring and incident handling
- Where does your budget go without explanation? A cloud bill that drifts is a FinOps issue, not a managed services one
- What would trip you up in a client audit? That is the sign to start with governance
/ Certified cloud partners
As certified Azure, AWS and Google Cloud partners, we draw on the hyperscaler ecosystem and leading technology vendors to design, operate and optimise your infrastructures according to market best practice.
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Frequently asked questions
It means entrusting all or part of the management of your information system to an external provider: day-to-day operations, monitoring, security, cost management or compliance. The scope is set during scoping and can range from night-time on-call cover alone to taking on the infrastructure in full.
Full outsourcing suits organisations with no in-house operations team, or those wanting a single partner accountable for the result end to end. Partial outsourcing is preferable when your teams already handle part of the scope: you then delegate only what blocks them, typically on-call duty, monitoring or one specific environment. The deciding factor is not company size but what your teams already do well.
Monitoring is limited to watching and alerting. Managed services cover the entire RUN lifecycle: monitoring, incident management, patching, backup, governance and reporting. It is a contractual commitment with defined SLAs, a dedicated point of contact and an organisation built around your constraints, during business hours or with 24/7 on-call cover depending on criticality.
As soon as your cloud costs exceed your forecasts without your being able to explain why. FinOps can be rolled out during a migration just as well as on existing environments. The clearest signal is being unable to attribute a cost to a team or a project.
No. Your cloud provider’s certification covers its infrastructure, not the way you configure your resources, manage access or process data. That responsibility is entirely yours, and it is precisely what we audit.
In most cases a performance audit uncovers quick wins without a rebuild: optimising slow queries, configuring caching, adding a CDN, adjusting sizing. We act on the critical points identified, then monitoring holds the level achieved over time.
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