My first decade of professional software development was working in assembly language. I suppose that I like low-level fundamental work.
Working on the metal. Nice!
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There is another reason that recalled while answering a newer question here just now:
Wladimir van der Laan's humble, intelligent, experienced, service-oriented, uplifting, tolerant, reluctant leadership style as lead maintainer of Bitcoin Core over a decade provided the original inspiration for me to consider returning to open source and working on Bitcoin Core. I think Wladimir is the gold standard and best example I have seen of open source maintainership that people can aspire to.
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