जब कर्मचारी खाता संख्या सत्यापित करे, तब पिन बदलिए।

This is a very common Hindi pairing meaning when ... then ....

• जब = when
• तब = then / at that time

So the structure is:

• जब employee verifies the account number,
• तब change the PIN.

In English, we often do not need then, but in Hindi जब ... तब ... is a natural matching pair.
Hindi can also sometimes omit तब, but keeping it makes the sentence feel clearer and more balanced.

करे here is a subjunctive-style form of करना. In this sentence, it is not describing a simple present fact like does or is doing. Instead, it is used in a time-condition sense:

• जब कर्मचारी ... सत्यापित करे = when the employee verifies / should verify / does verify

This kind of form is common after words like जब, अगर, and in formal instructions.

Compare:

• कर्मचारी सत्यापित करता है = the employee verifies / is verifying
  (a plain statement)
• जब कर्मचारी सत्यापित करे = when the employee verifies
  (part of a condition or instruction)

So करे fits the instructional, conditional style better.

Because ने is generally used with transitive verbs in the perfective past, not here.

This sentence is not in a completed past action like:

• कर्मचारी ने खाता संख्या सत्यापित की = the employee verified the account number

Instead, this sentence uses करे, which is not a perfective past form. So कर्मचारी appears without ने.

That is why:

• जब कर्मचारी ... सत्यापित करे is correct
• not जब कर्मचारी ने ... सत्यापित करे

बदलिए is a polite imperative form of बदलना = to change.

So:

• बदलिए = please change / change (formal, polite)

This is the kind of form you see in instructions, notices, customer service language, or respectful speech.

Compare:

• बदल = very blunt / basic command
• बदलो = informal command
• बदलो might be used with a friend or someone younger
• बदलें / बदलिए = polite/formal command

In this sentence, बदलिए sounds appropriate because the whole sentence is formal and instructional.

Not by itself in the same way that करना or जाना is a basic verb.
सत्यापित is a formal Sanskrit-based word meaning verified or verify-related, and in Hindi it commonly combines with करना to make the action to verify.

So:

• सत्यापित करना = to verify
• सत्यापित करे = verify / should verify / does verify in this clause

This pattern is very common in Hindi, especially in formal language:

• जाँच करना = to inspect/check
• पुष्टि करना = to confirm
• सत्यापित करना = to verify

So the real verbal engine here is करे, while सत्यापित carries the meaning of verification.

Hindi often puts nouns together in a compound-like way, especially in formal language.

• खाता = account
• संख्या = number

Together:

• खाता संख्या = account number

This is similar to English noun combinations like account number, phone number, bank account, etc.

In everyday speech, many speakers might also say:

• अकाउंट नंबर

But खाता संख्या is a more Hindi-heavy, formal version.

Because खाता संख्या is the direct object of सत्यापित करे, and direct objects in Hindi often appear with no postposition.

So:

• कर्मचारी खाता संख्या सत्यापित करे = the employee verifies the account number

There is no need for something like को here.

Hindi uses को for certain direct objects, especially specific people, animate objects, or in other special cases, but inanimate things like खाता संख्या often appear unmarked.

For the same reason: पिन is the direct object of बदलिए, and inanimate direct objects often appear without को.

So:

• पिन बदलिए = change the PIN

This is normal Hindi.

You may sometimes see को with direct objects in other contexts, but here it would usually sound unnecessary.

कर्मचारी is often used as a common-gender noun in modern Hindi, especially in official or workplace language. It can refer to an employee regardless of gender.

In this sentence, nothing else forces a masculine/feminine distinction, because:

• कर्मचारी itself does not change here
• करे also does not show gender
• बदलिए does not show the employee’s gender either

So the sentence can work for a male or female employee.

Yes, somewhat. Hindi word order is flexible, though some versions sound more natural than others.

The given order:

• जब कर्मचारी खाता संख्या सत्यापित करे, तब पिन बदलिए।

is very natural and clear.

You could also say:

• पिन तब बदलिए जब कर्मचारी खाता संख्या सत्यापित करे।

This puts emphasis on change the PIN only then.

So the order can move around, but the original version is a standard instruction-style structure.

No, not always. You can say:

• जब कर्मचारी खाता संख्या सत्यापित करे, पिन बदलिए।

and it is still understandable.

But तब helps make the pair जब ... तब ... more complete and explicit. In formal writing and instructions, that can sound better.

So:

• with तब = more balanced, slightly clearer
• without तब = still valid, a little shorter

Because several features are formal:

• सत्यापित is a formal, official word
• खाता संख्या is more formal than अकाउंट नंबर
• बदलिए is a polite/formal command
• the जब ... तब ... structure is common in formal instructions

A more conversational version might sound like:

• जब कर्मचारी अकाउंट नंबर चेक कर ले, तब पिन बदल दीजिए।

That version is less official and more everyday.
The original sentence sounds like something from a bank, form, website, or customer service instruction.

Yes. You may see both बदलिए and बदलिये in real usage.

In modern standard spelling, बदलिए is often preferred, but बदलिये is also common and widely understood.

So if you encounter both, do not worry—they represent the same polite imperative meaning here.

It follows a very useful formal instruction pattern:

• जब + subject + object + verb-subjunctive, तब + command

Here that becomes:

• जब
  • कर्मचारी
    • खाता संख्या
      • सत्यापित करे,
• तब
  • पिन
    • बदलिए

So you can learn it as a model:

• जब X करे, तब Y कीजिए
• When X happens, then do Y

This pattern is especially useful in instructions, procedures, and official writing.