Proje mühendisi, sistematik testler gerçekleştirerek mekanizmanın güvenilirliğini teyit etti.

The sentence is built like this:

Proje mühendisi + sistematik testler gerçekleştirerek + mekanizmanın güvenilirliğini + teyit etti

A natural breakdown is:

• Proje mühendisi = the project engineer
• sistematik testler gerçekleştirerek = by carrying out systematic tests
• mekanizmanın güvenilirliğini = the mechanism’s reliability
• teyit etti = confirmed / verified

So the overall structure is:

Subject + adverbial action + object + main verb

This is very normal in Turkish, especially with the main verb at the end.

Gerçekleştirerek comes from gerçekleştirmek, which means to carry out, to perform, or sometimes to realize/implement, depending on context.

The ending -erek / -arak is a converb ending. It often means:

• by doing
• while doing
• and doing

So:

• testler gerçekleştirerek = by carrying out tests

In this sentence, it explains how the engineer confirmed the reliability:

• sistematik testler gerçekleştirerek = by conducting systematic tests

Because testler here is a non-specific / indefinite plural object inside the -erek phrase.

• sistematik testler = systematic tests, some systematic tests, testing in a systematic way
• sistematik testleri would suggest specific tests already known from context: the systematic tests

So the sentence presents the tests as the means used, not as a specifically identified set already established in the conversation.

This is a very common Turkish pattern:

• bare plural object = general or non-specific
• accusative-marked object = specific/definite

Mekanizmanın is mekanizma + -nın, the genitive ending.

It means:

• mekanizma = mechanism
• mekanizmanın = of the mechanism / the mechanism’s

This is the first half of a Turkish genitive–possessive construction, which is how Turkish often expresses English X’s Y or the Y of X.

So:

• mekanizmanın güvenilirliği = the mechanism’s reliability

Because this word is doing several jobs at once.

The base noun is:

• güvenilirlik = reliability

But in the phrase mekanizmanın güvenilirliği, Turkish uses a possession pattern:

• mekanizmanın = of the mechanism
• güvenilirliği = its reliability

Then, because the whole phrase is the direct object of teyit etti, it gets the accusative too:

• güvenilirliğini = its reliability as a specific object

So the full phrase means:

• mekanizmanın güvenilirliğini teyit etti = confirmed the mechanism’s reliability

Yes:

• güvenilirlik = reliability
• güvenilirliği = its/the reliability
• güvenilirliğini = its/the reliability + accusative

More specifically:

• güvenilirlik = noun stem
• -i = 3rd person possessive suffix in this construction
• -ni = accusative after a possessive ending

So:

• mekanizmanın güvenilirliği = the mechanism’s reliability
• mekanizmanın güvenilirliğini = the mechanism’s reliability, as the thing being confirmed

This is a common sound/spelling change in Turkish.

The base word ends in -k:

• güvenilirlik

When a vowel-initial suffix is added, final k often softens to ğ:

• güvenilirlik → güvenilirliği

This kind of consonant softening happens in many words, for example:

• renk → rengi
• çocuk → çocuğu

So this is not an irregular word; it is a normal Turkish sound change.

Teyit etmek is a common Turkish compound verb meaning to confirm or to verify.

It is made from:

• teyit = confirmation / verification
• etmek = to do, to make

In Turkish, many verbs are formed this way:

• a noun or verbal noun
• plus etmek

In the past tense:

• teyit etti = confirmed

It is written as two words because it is a compound verb, just like:

• kontrol etti = checked
• kabul etti = accepted
• fark etti = noticed

Turkish does not have articles like English the and a/an.

So Proje mühendisi can mean:

• the project engineer
• a project engineer

Which one is intended depends on context.

In this sentence, English would usually translate it as the project engineer, because it sounds like a specific person in context. But Turkish itself does not mark that with an article.

The same idea applies elsewhere in the sentence too.

Turkish usually places the main verb at the end.

English:

• The project engineer confirmed the mechanism’s reliability by carrying out systematic tests.

Turkish:

• Proje mühendisi ... mekanizmanın güvenilirliğini teyit etti.

That final-verb pattern is one of the biggest differences from English.

Also, Turkish often puts the manner / means phrase before the main object or before the verb:

• sistematik testler gerçekleştirerek = by carrying out systematic tests

So even if the order feels unusual from an English perspective, it is very natural in Turkish.

Not really. It is more of a stylistic pause than a strict grammatical requirement here.

You could very naturally write:

Proje mühendisi sistematik testler gerçekleştirerek mekanizmanın güvenilirliğini teyit etti.

The meaning does not change.

In modern Turkish prose, that comma is often omitted unless the writer wants a slight pause or emphasis.

Yes. Turkish allows some flexibility in word order.

For example, these are also natural:

• Proje mühendisi mekanizmanın güvenilirliğini sistematik testler gerçekleştirerek teyit etti.
• Sistematik testler gerçekleştirerek proje mühendisi mekanizmanın güvenilirliğini teyit etti.

The main verb teyit etti still usually stays at the end.

The original version is perfectly natural; changing the order mostly changes focus or emphasis, not the core meaning.