Tinder, a dating app, has recently updated its Terms of Service. Among minor bureaucratic modifications, one major change aims to battle impersonations. From now on, Tinder will ban web developers who claim to be 'engineers'. While backend- and other types of software developers seem to be unaffected, many believe the ToS will be amended soon to include those as well.
In the railway context an engineer was the person who worked the engine.
In German the word comes from Latin roughly meaning inventor. Presumably the general usage of the word engineer in English has the same etymology.