think around 2010 I worked for the one and only payment processor in my country. All ATM tx, POS, online were handled. The back office handling was done with Agile and Java. It was a pile of garbage. The frontend was still a massive mainframe. It had 10k+ COBOL program running it. With comment changelog on top from somewhere end of the 70s. The code review guy was doing this for 20 years and could tell if things would be slow and not scale all the Tx with just reading the code. Until today they never replaced it and is still running on it.
sometimes you don't need fancy new stuff. Just learn the things very well at your disposal. Heck sed, awk and bunch of simple cli tools still work well on Big data sets :)
sometimes you don't need fancy new stuff. Just learn the things very well at your disposal. Heck sed, awk and bunch of simple cli tools still work well on Big data sets :)