A well written CV always uses the active voice and not the passive voice use. Many people do not understand what passive voice is. A passive voice formation happens when the writer makes the object of an action into the subject of a sentence. An active voice appears more powerful,direct, and effective than passive voice.
It is not a grammatical error to use ther passive voice , but it is a stylistic issue. A passive voice can lessen the impact of a statement. An active voice suggests a person did something. A passive voice can give the impression of something happens to you rather than you initiating the event. Hence using the active tense gives an impression of someone who makes things happen as opposed to someone who waits for events to happen to them.
The formula for passive voice is "to be" + past participle = passive voice
Where "to be" is one of is, are, am , was, were, has been, have been, had been, will be, will have been, being. This website has algorithms which will spot most of these cases.
Examples of passive voice use. Note how the system displays these:
Passive voice: Was (passive voice) rewarded for improving company training schemes.
Active voice: Produced excellent training schemes, leading to company recognition.
Passive voice: An award winning website was (passive voice) designed by me.
Active voice:Designed an award winning website.
Passive voice: Weekly financial reports were (passive voice) generated by me.
Active voice:Generated the weekly financial reports.