Our company needs an agency to provide Coding/Tech Maintenance

We are a group of 6 companies with several websites, web applications and databases. We need an agency that's able to do basic Server Maintenance (backups, configurations, software updates, security patches, etc) on a monthly basis, and that can additionally give us a quote for software development on an hourly basis.

The right agency will have managed at least 10 similar projects in the past and should have a DevOps Specialist in the team applying for the position. We use a Dedicated Bare Metal Cloud Server from OVH running a Proxmox VM, MailCow Dockerized with SOGo for our company emails and Larevel/PHP, React.JS/Vue.JS/.NET Core, Wordpress websites and applications, with MySQL and SQL Server for the databases.

Please share details about your agency's previous experiment with this model of working and this stack, and we'll be happy to schedule an interview.