Over the years I have worked with almost all of the leading open source technologies, of which you will find a list below. Of course, by no means everything is listed here, nor do I claim to be an expert in all these technologies, but being tech-savvy with a broad knowledge and experience in the field, I can quickly master the necessary skills needed to support existing or new projects.
From this rather extensive list, a selection was made of only the best tools and applications that provide the building blocks and foundation for setting up and managing reliable and highly available IT environments. In this context, Ubuntu server (LTS) was chosen as the default operating system that has a proven track record of being rock solid and secure, but at the same time progressive, innovative and versatile. Ubuntu is also the driving force behind LXD (Linux containers) which, as a system container, I believe provides the best platform for building cloud agnostic and highly scalable infrastructure.
More recently, the focus has been on providing the expertise needed to successfully deploy self-hosted and web-based business applications that not only give businesses access to the latest technologies at minimal cost, but also full control over the data that is stored and who gets access. The list of available self-hosted Open Source applications is unprecedented and new projects are added daily. Some popular supported apps include Nextcloud, OnlyOffice, Collabora, RocketChat, Mautic, Matomo, SuiteCRM, Dolibarr, WordPress and Woocommerce, which I obviously use extensively myself.
Since most of these applications are mission-critical and essential to the operation of a business, the slightest glitch can jeopardize the continuity of the organization. So always consult an experienced professional before designing, building, securing and maintaining a cloud agnostic infrastructure, and make sure you have a solid backup and recovery plan that is regularly reviewed and thoroughly tested so that a disaster does not become fatal to the business.