Deneme süresi bitmedikçe bu pozisyondaki performans değerlendirmesi tamamlanmayacak.

Bitmedikçe comes from the verb bitmek (to end / to be finished).

It is made up of:

• bit- = verb stem
• -me- = negation
• -dikçe = a suffix meaning as long as, until, or so long as

So bitmedikçe means roughly:

• as long as it has not ended
• until it ends
• unless it ends (depending on context)

In this sentence, it gives the idea that the evaluation will not be completed before the trial period ends.

Both forms are possible in Turkish, but they express different ideas.

• bitince = when it ends / once it ends
• bitmedikçe = until it ends / as long as it hasn’t ended

So:

• Deneme süresi bitince... focuses on the moment after the trial period ends.
• Deneme süresi bitmedikçe... focuses on the fact that before that point, something will not happen.

This sentence is emphasizing a condition that remains true up to that endpoint: the performance evaluation will not be completed while the trial period is still ongoing.

Deneme süresi is an indefinite noun compound in Turkish:

• deneme = trial, probation
• süre = duration, period
• süresi = its period / period of

In Turkish, compounds like this are very common:

• okul kapısı = school door
• iş görüşmesi = job interview
• deneme süresi = trial period / probation period

The second noun usually takes the 3rd person possessive suffix:

• süre → süresi

That is why it is deneme süresi.

Pozisyondaki means in the position or belonging to the position / associated with the position, depending on context.

It breaks down like this:

• pozisyon = position
• pozisyonda = in the position
• pozisyondaki = the one that is in the position / the one associated with that position

The suffix -ki turns a location expression into something adjectival.

So:

• bu pozisyondaki performans değerlendirmesi = the performance evaluation in/for this position

A natural English translation might be:

• the performance evaluation for this position

This is another noun compound.

• performans = performance
• değerlendirme = evaluation, assessment
• performans değerlendirmesi = performance evaluation

Just like deneme süresi, this is an indefinite compound, and the second noun takes the 3rd person possessive ending:

• değerlendirme → değerlendirmesi

So performans değerlendirmesi literally looks a bit like evaluation of performance, but in normal English we simply say performance evaluation.

The subject of the sentence is:

bu pozisyondaki performans değerlendirmesi

That whole phrase functions as one noun phrase:

• bu = this
• pozisyondaki = in/for the position
• performans değerlendirmesi = performance evaluation

So the subject is:

this position’s performance evaluation
or more naturally,
the performance evaluation for this position

A common challenge for English speakers is that Turkish often stacks several modifiers before the main noun. The main noun here is değerlendirmesi.

Tamamlanmayacak comes from tamamlanmak, which means to be completed.

It breaks down like this:

• tamamla- = to complete
• -n- = passive/reflexive-type marker here, giving tamamlanmak = to be completed
• -ma- = negation
• -yacak = future tense

So:

• tamamlanacak = will be completed
• tamamlanmayacak = will not be completed

It is passive because the sentence focuses on the evaluation, not on who completes it. Turkish often uses the passive in formal or administrative language, just like English does:

• The evaluation will not be completed

Because Turkish is normally an SOV language:

• Subject – Object – Verb

In this sentence, the structure is roughly:

• Deneme süresi bitmedikçe = until the trial period ends
• bu pozisyondaki performans değerlendirmesi = the performance evaluation for this position
• tamamlanmayacak = will not be completed

So the finite verb usually comes at the end. This is one of the biggest word-order differences from English.

In this sentence, it is closest to until.

• Deneme süresi bitmedikçe ... tamamlanmayacak
• The evaluation will not be completed until the trial period ends

Sometimes -medikçe can feel like unless in English, especially in other contexts, but here the best reading is temporal and conditional at the same time: not before that point.

So for this sentence, think:

• until the trial period ends rather than
• unless the trial period ends

Yes. A simpler version might be:

Deneme süresi bitmeden bu pozisyondaki performans değerlendirmesi tamamlanmayacak.

This also means:

• The performance evaluation for this position will not be completed before the trial period ends.

The difference is small:

• bitmedikçe emphasizes as long as it hasn’t ended
• bitmeden emphasizes before it ends / without it ending

The original sentence sounds a bit more formal and condition-like.

Yes, it sounds fairly formal and administrative.

Reasons:

• performans değerlendirmesi is workplace/HR vocabulary
• tamamlanmayacak is a formal passive future form
• the overall structure is typical of policy or process language

A more conversational Turkish sentence might be shorter or more direct, but this version fits things like:

• HR notices
• internal policy documents
• official emails
• employee evaluation procedures