20+ years of programming have taught me that there is no "best" language. Some programming languages are better at certain tasks than others, and vice-versa. To make projects manageable, I always try to pick the right tool for the job.
I'm well-versed in most types of database. This includes relational as well as NoSQL databases of all kinds (e.g., graph, document, column, key-value).
Managed and proprietary databases are also where my expertise lays. Such as those by Google Cloud Platform (GCP), Amazon Web Services (AWS), and Microsoft Azure.
I typically build complex web applications with reactive components using frameworks and libraries such as Angular and React. This is especially the case for Single Page Applications (SPAs) and Progressive Web Apps (WPAs). For interactive 3D content I rely on WebGL and typically use a library such as Babylon.
Tests help us make better programs. Personally, I focus on unit testing and integration testing with the use of various frameworks and libraries; as part of a Continuous Integration pipeline.