Mainly, I do infrastructure support. We do fine-tuning, information, configuration, higher-level availability, and replication. Also, single and clustering solutions - both kinds.
We do on-premises and cloud deployments. This is because some customers use Microsoft Azure, mainly in the financial sector, such as the Sri Lanka Government, who has many databases that cannot go on the cloud. The financial sector also works with on-prem databases.
I am mainly using the SQL Server from 2019. That's the latest version since last January while our customers are mainly using the 2016 and 2017 versions. This is because we are not providing the latest version. We are testing some bugs now. In terms of functionality, I think the 2017 version is better. I have not fully tested the 2019, so I cannot give a recommendation for it.