ksh (bash, sh, dash, ksh, ... posix-sh) scripting. (use search kshji, see more).
Postgresql using last 15 years. Big tables, powerful using, ... with xml, json fields.
Integration csv, json, xml, ... and databases.
Excel to PG and PG to Excel.
cgi with Apache.
API-integration using many methods: ftp, sftp, scp, http-request, pipes, ...
Some new project using Go.
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Used ksh (sh,ksh,bash,posixsh,...) since 1984. Last 25 years 95% from all codes has done using ksh (awk,sed,grep,... subtools). Textfile based datastore, webservices, "ajax" before ajax, netserver and client services using ksh, ...
ex. HP's main instructor in Finland since 1998 (shell programming, network services HP/UX), also in SCO environment. Own material for Unix commands, admin SCO+Linux, shell programming material (ksh=sh, bash, ...), socket programming using C, ...
C ? 1987-1995 mostly all was done using C. Today only some network client and server tools if speed is important.