45 years with PDP11, UNIX, SQL, Oracle (starting with the incredibly buggy v3), MacOS (starting with Lisa). Solved the Nth best salesman problem in pure SQL (no rank or row_number) in 1987 with subqueries. Been running production servers on Solaris, Debian, and MacOS for 35 years. Languages with very high competence include (in rough chronological order): Basic, Pascal, C, SQL, 8086 Assembler, Perl, Javascript, Swift. Currently developing full-stack apps for iOS/macOS using Postgres and GRPC.