I have worked in .NET/C# for the last 15 years professionally. The bulk of my open source projects in that time have been in .NET.
Since I've been fulfilling a full-stack development role I've spent a lot of time working in Javascript for the last 15 years as well.
The earliest software I wrote was in C and for a time I developed exclusively in C++. I only use these professionally in a small capacity for some legacy utilities.
My professional workspace over the last 15 years has been a mix of Windows and Linux systems. Mostly Windows Server 2012, CentOS, and Debian. My focus at the OS level has been tuning to optimize for the workload being run on a particular host.
Maintaining a large SQL server installation that backs a SAAS has been a lage part of my workload for the last 15 years. In that time I've learned a quite a lot about how to best maintain SQL server and how to best interact with it when composing software.
In addition to SQL server, I've also managed large PostgreSQL installations backing SAAS providers for the last 15 years. These systems have been ground-up designs focusing on highly structured data with minimal duplication.
I've maintained a large ElasticSearch cluster professionally as an auxillary componenet of a SAAS as a repository for log events and loose data collection.
I've maintained Exim as a inbound mail relay that primarily functions as a mail forwarder to final destinations.
I've maintained multiple PowerMTA installations sending multiple millions of daily messages.
I've setup and maintained an Apache installation as a balancing and caching proxy that handles all inbound HTTP requests for a large SAAS.
Similar to my experience with Apache but focused on working at the TCP layer.
When not parked at a keyboard, I enjoy reading, fishing, hiking, and trail running.