Он считается опытным.

Literally, it is something like He counts/is regarded as experienced.

In natural English, it is usually translated as:

• He is considered experienced
• He is regarded as experienced

The verb считаться often means to be considered or to be regarded as.

The basic dictionary form is считаться.

Here is how считается breaks down:

• счита- = verb stem
• -ет = 3rd person singular present tense
• -ся = reflexive/postfix

So считается means is considered / is regarded in the present tense.

Because the subject is он (he), the verb is in 3rd person singular.

The -ся changes the meaning significantly.

Compare:

• считать = to count, to consider
• считаться = to be considered, to be regarded

So:

• Я считаю его умным = I consider him smart
• Он считается умным = He is considered smart

In this sentence, -ся helps create a passive-like meaning: not he considers, but he is considered.

No. Он считается опытным does not mean He considers himself experienced.

If you want to say He considers himself experienced, Russian would normally use:

• Он считает себя опытным

That is a very important difference:

• Он считается опытным = other people generally regard him as experienced
• Он считает себя опытным = he himself thinks he is experienced

Because after считаться in this meaning, Russian normally uses the instrumental case for the adjective or noun that describes how someone is regarded.

So:

• опытный = nominative masculine singular
• опытным = instrumental masculine singular

That is why the sentence is:

• Он считается опытным

not

• Он считается опытный

This is a common pattern in Russian with verbs meaning to be / become / seem / be considered.

Опытным is instrumental singular masculine.

It matches он, which is masculine singular.

Here is the adjective опытный in a few forms:

• masculine nominative: опытный
• feminine nominative: опытная
• neuter nominative: опытное
• plural nominative: опытные
• masculine instrumental: опытным

Since он is masculine singular, the instrumental form is опытным.

In present-tense Russian, the verb to be is usually omitted.

So where English says:

• He is experienced
• He is considered experienced

Russian often simply says:

• Он опытный = He is experienced
• Он считается опытным = He is considered experienced

There is no present-tense is equivalent written separately in normal Russian sentences like this.

Yes, and the meaning is different.

• Он опытный = He is experienced
  This is a direct statement about him.

• Он считается опытным = He is considered experienced
  This emphasizes reputation, general opinion, or how people see him.

So считается adds the idea of public perception or accepted opinion.

Very often, yes, but not always in exactly the same way as English passive.

It can mean:

• to be considered
• to be regarded
• sometimes to count as

For example:

• Это считается ошибкой = This is considered a mistake
• Это не считается = That doesn’t count

So the exact English translation depends on context.

Yes. Russian word order is flexible.

The neutral order is:

• Он считается опытным

But you may also see:

• Опытным он считается
• Он опытным считается

These alternatives can shift emphasis slightly. For example, putting опытным first may emphasize experienced in contrast to something else.

For a learner, the standard neutral version Он считается опытным is the best one to remember first.

Yes, very often.

For example:

• Он считается опытным врачом = He is considered an experienced doctor
• Она считается опытным специалистом = She is considered an experienced specialist

Here both the adjective and the noun are in the instrumental case:

• опытным
• врачом / специалистом

That is a very common structure in Russian.

It is fairly neutral and a little more bookish/formal than a simple everyday statement like Он опытный.

You could hear or read Он считается опытным in:

• conversation
• journalism
• biographies
• academic or professional contexts

It sounds natural, but it is slightly more formal than the direct statement without считается.

Считаться is the imperfective verb.

In this sentence, it is in the present tense:

• Он считается опытным = He is considered experienced

This works well because it describes a current general opinion or ongoing status.

A perfective form is less likely in this kind of simple general statement. For learners, the important point is that считается here expresses a present, ongoing reputation.