Learn Hardcore Hausa: Wannan wajibi ne.

wannan = this / this one
wajibi = obligatory, required, necessary
ne = a sentence-final copular particle, roughly doing the job of is in this kind of sentence

So the whole sentence means This is necessary or This is obligatory.

Why is ne at the end instead of a word meaning is in the middle?

That is normal Hausa word order for this type of sentence.

In English, you say This is necessary.
In Hausa, a very common pattern is:

subject + predicate + ne/ce

So Wannan wajibi ne is literally closer to This necessary is, even though the natural English translation is This is necessary.

Is ne basically the Hausa word for is?

Only partly. It is better to think of ne as a copular marker used in certain sentence types, especially identification and classification sentences.

So yes, in this sentence it plays a role similar to is, but Hausa does not have one single word that matches English to be in every situation. Different Hausa structures are used in different kinds of sentences.