אני רוצה לשתף אותך בהחלטה לפני שאני חותמת על החוזה.

Here לשתף does not just mean to share in the simple sense of handing something over. In the pattern לשתף מישהו ב..., it means to share something with someone, to let someone in on something, or to involve someone in something.

So לשתף אותך בהחלטה means something like:

• to share the decision with you
• to involve you in the decision
• to let you in on the decision

The exact English wording depends on context, but the Hebrew structure is very common.

The ל- is the normal marker of the Hebrew infinitive, often equivalent to English to.

So:

• לשתף = to share / to involve
• לחתום = to sign
• לרצות = to want

In אני רוצה לשתף אותך..., the structure is literally I want to share you in the decision according to Hebrew grammar, though the natural English meaning is smoother than that.

Because לשתף works with two parts:

• the person is the direct object: לשתף אותך
• the thing/topic is introduced by ב-: בהחלטה

So the pattern is:

לשתף מישהו ב משהו

Examples:

• לשתף אותך בסוד = to share a secret with you
• לשתף אותם בתוכנית = to share the plan with them
• לשתף אותנו בהחלטה = to involve us in the decision

This is just the standard verb pattern you need to learn with לשתף.

בהחלטה is made of:

• ב = in / with / regarding, depending on context
• החלטה = decision

Literally it looks like in the decision, but in this verb pattern it is better understood as in the matter of the decision or regarding the decision.

So לשתף אותך בהחלטה is not a word-for-word copy of English. It is an idiomatic Hebrew structure.

Also notice that ב + ה becomes בה in writing, so:

• ב + החלטה → בהחלטה

We know because of חותמת.

• חותם = masculine singular, signing / sign
• חותמת = feminine singular, signing / sign

So:

• אני חותם על החוזה = a male speaker
• אני חותמת על החוזה = a female speaker

Interestingly, רוצה does not clearly show gender here in normal unpointed writing, because masculine and feminine singular are spelled the same. The gender becomes clear from חותמת.

This is very common in Hebrew. The present form can refer to a near future or planned future action, especially in clauses with words like:

• לפני ש... = before
• כש... = when
• אחרי ש... = after

So לפני שאני חותמת על החוזה naturally means before I sign the contract.

Hebrew often uses the present here where English uses a present form with future meaning too, as in before I sign.

Yes. That is also correct.

There is a slight difference in feel:

• לפני שאני חותמת על החוזה sounds very natural and conversational
• לפני שאחתום על החוזה can sound a bit more concise or slightly more formal

Both mean before I sign the contract.

So both of these work:

• אני רוצה לשתף אותך בהחלטה לפני שאני חותמת על החוזה
• אני רוצה לשתף אותך בהחלטה לפני שאחתום על החוזה

Because Hebrew normally needs an explicit subject in a clause like this:

לפני שאני חותמת על החוזה

Literally: before that I am signing the contract

Even though the subject is already clear from the first part of the sentence, Hebrew still commonly repeats it in the subordinate clause.

So this repetition is normal and natural. English also does something similar:

• I want to tell you before I sign
• not usually I want to tell you before sign

With the verb לחתום, Hebrew normally uses על before the document:

• לחתום על חוזה = to sign a contract
• לחתום על מכתב = to sign a letter
• לחתום על הטופס = to sign the form

So even though על often means on, here you should think of it as part of the standard expression לחתום על.

It is just how Hebrew says to sign a document.

It can be either. In normal Hebrew spelling, אותך can refer to:

• you masculine singular, pronounced roughly otkha
• you feminine singular, pronounced roughly otakh

The spelling is the same without vowel marks, so context or speech tells you which one is meant.

החוזה means the contract, so it refers to a specific contract that speaker and listener already know about.

• על חוזה = on a contract
• על החוזה = on the contract

In this sentence, the speaker apparently means a particular contract, so החוזה is the natural choice.

If the meaning were more general, you could say:

• לפני שאני חותמת על חוזה = before I sign a contract

Yes, it is natural Hebrew.

A native speaker could say exactly this. It sounds polite, clear, and fairly natural. Depending on context, a speaker might also choose slightly different wording, for example:

• אני רוצה לשתף אותך לפני שאני חותמת על החוזה
• אני רוצה להתייעץ איתך לפני שאני חותמת על החוזה

But your sentence is perfectly good Hebrew, especially if the idea is not just consulting someone but specifically including them in the decision.