Elektronik başvuru geçerli değil; üstelik iletişim bilgileri de yok.

In Turkish, a bare noun can often correspond to English the, a/an, or just a general category, depending on context.

So Elektronik başvuru geçerli değil can mean:

• The electronic application is not valid
• An electronic application is not valid
• Electronic application is not valid

Adding bir would make it feel more like an electronic application in a more specific or countable sense, but it is not necessary here. In formal notices and statements, Turkish often leaves nouns bare.

Başvuru means application, appeal, or submission, depending on context.

It comes from the verb başvurmak, which means to apply or to appeal/request officially.

So:

• başvurmak = to apply
• başvuru = application

This kind of noun formation is very common in Turkish: a verb can become a noun that names the action or result.

Geçerli is an adjective meaning valid.
To say is not valid, Turkish uses the adjective plus değil:

• geçerli = valid
• geçerli değil = not valid

This is the normal way to negate noun/adjective predicates in Turkish.

Compare:

• Başvuru geçerli. = The application is valid.
• Başvuru geçerli değil. = The application is not valid.

So değil is not a verb meaning not by itself; it is the standard negator used with nominal and adjectival predicates.

This is a very common question, because Turkish uses değil and yok differently.

• değil negates a noun or adjective predicate
• yok means there is not / does not exist / is absent

So:

• Başvuru geçerli değil. = The application is not valid.
  (geçerli is an adjective)

But:

• İletişim bilgileri yok. = There is no contact information / The contact details are missing.
  Here the idea is absence, so Turkish uses yok.

A useful pair to remember:

• var = there is / there are
• yok = there is not / there are not

So:

• İletişim bilgileri var. = There is contact information.
• İletişim bilgileri yok. = There is no contact information.

Üstelik means something like:

• moreover
• besides
• on top of that
• what’s more

It adds another negative or noteworthy point.

So the sentence structure is:

• Elektronik başvuru geçerli değil;
• üstelik iletişim bilgileri de yok.

Meaning:

• The electronic application is not valid; moreover, the contact information is missing too.

It has a slightly formal written tone.

The semicolon is a punctuation choice that links two closely related statements while keeping them separate.

The writer could also have used:

• a period: Elektronik başvuru geçerli değil. Üstelik iletişim bilgileri de yok.
• a comma in some styles, though the semicolon is clearer here

The semicolon helps show:

1. the first statement is complete
2. the second statement adds another point

So it is mainly a stylistic and punctuation choice, not a special grammar rule.

Literally:

• iletişim = communication / contact
• bilgi = information / piece of information
• bilgileri = its/the information, or the information/details, depending on structure

As a whole, iletişim bilgileri means:

• contact information
• contact details

Turkish often uses a plural form where English might prefer an uncountable singular. In English, contact information is common; in Turkish, contact details-type wording is very natural.

You may also see:

• iletişim bilgisi = contact information
• iletişim bilgileri = contact details / contact information

Both are possible, but bilgileri is extremely common in real usage.

It looks like just a plural ending, but this structure is a little more interesting.

In iletişim bilgileri, the second word is part of a noun compound. Turkish often forms these with a special ending on the second noun.

Very roughly:

• iletişim bilgisi = contact information
• iletişim bilgileri = contact details / contact information

Here -leri can reflect the pluralized compound form. In everyday learning terms, it is best to memorize iletişim bilgileri as a fixed expression meaning contact information/details.

So yes, there is a plural idea there, but the phrase works as a set noun phrase, not just as a simple information + plural combination in the English sense.

Here de means also / too.

So:

• iletişim bilgileri yok = there is no contact information
• iletişim bilgileri de yok = the contact information is also missing / there is no contact information either

It adds the sense that this is an additional problem.

That fits well with üstelik:

• The electronic application is not valid; moreover, the contact information is also missing.

Important: this de is written separately.

No. They look similar, but they are different things.

1. de = also / too

   • written separately
   • example: Ben de geldim. = I came too.

2. -de / -da = locative suffix meaning in / on / at

   • written attached to the word
   • example: Evdeyim. = I am at home.

So in your sentence:

• iletişim bilgileri de yok

the de is the separate particle meaning also/too, not the locative suffix.

Turkish word order is flexible, but the neutral order here is very natural.

The core idea is:

• İletişim bilgileri yok. = There is no contact information.

Adding de after iletişim bilgileri emphasizes that this noun phrase is also part of the problem:

• İletişim bilgileri de yok.

You could move things around for emphasis in some contexts, but this version sounds normal and clear.

A helpful way to read it is:

• As for the contact information, that is also absent.

Yes. Geçerli değil can often be translated naturally as:

• is not valid
• is invalid

Both are fine in English.

However, grammatically in Turkish, the sentence is literally:

• valid + not

So for learning purposes, it is useful to remember the Turkish structure as geçerli değil, even if natural English may prefer invalid.

Yes, it sounds fairly formal or administrative.

Reasons:

• başvuru is a common official word for application
• geçerli değil is standard formal wording
• üstelik is somewhat more formal than everyday hem de or bir de
• iletişim bilgileri is typical bureaucratic/institutional language

So this sounds like something you might read in:

• an official notice
• an email from an institution
• a website message
• an application review comment

Yes, depending on context, yok can be understood in several very similar ways in English:

• There is no contact information
• The contact information is missing
• No contact details are provided
• We don’t have your contact information

The Turkish sentence itself simply states absence. English chooses the most natural phrasing based on context.

So yok does not always translate word-for-word the same way, but the core idea is: it is absent / not available.

A more casual version might be something like:

• Elektronik başvuru geçerli değil, bir de iletişim bilgileri yok.
• Elektronik başvuru geçersiz, bir de iletişim bilgileri de yok.

Notes:

• üstelik can be replaced by bir de in more conversational speech
• geçerli değil and geçersiz are both possible; geçersiz means invalid

But the original sentence is perfectly natural, especially in written formal Turkish.