Do you mean figuratively that OP is replacing Cobol? Because I don't see that in the article. It mentions other technology that I would not associate with a sup

Do you mean figuratively that OP is replacing Cobol? Because I don't see that in the article. It mentions other technology that I would not associate with a super-conservative stack - like Databricks, JSON, Postgres and Google Analytics. So I'm a bit confused by your comment. And by all the downvotes, honestly. I just pointed out that personally I would not consider Lambda - which has been a stable and popular technology for 10 years - to be cutting-edge. It's not old but also not cutting-edge imo. I would reserve that term to newer technology. Apparently a controversial view on HN, which is interesting. To respond to your question, I did work for a bank in 2017 with moving certain burst-type processing to a set of Lambdas.