Im most proud of myself for setting up a little server application that some of my GitHub repos are connected to through webhooks. When I push a commit to master, the webhook fires, my server calls git pull and builds and the code is ready to go. Very little downtime and no need to ssh and scp
VanillaJS for simple interfaces / React for complex ones
PostgreSQL for the RDBMS
ElasticSearch for search features on datasets greater than 1TB
In a FreeBSD jail