[jardaroh]

This all depends on what engineers you need to hand your stuff over to and what type of software as well.

For anyone learning programming I would always suggest Python as the best starting language as it is expressive and easy to read. However, if you already deal a great deal with HTML/CSS then Javascript is the best fit. Check which tech stack the engineers are using.

For example, if they use Django, then pretty much all that would be needed to learn, most likely, is the Django framework's templating language. If they use Django REST Framework and an angular frontend, then Angular would be the best to learn (javascript).

Good luck!