The effectiveness of HR is judged by the increase in KPIs of the employees it selects. To provide an instrumental basis for such a choice, it is necessary to overcome several nonlinear effects. From previous studies and literature sources, the authors have a strong opinion that the age of the employee has the greatest impact on KPI, and its dynamics depend little on the activity profile. The KPI value of the employees of the Produpak enterprise repeats the change in the dynamics of success of people of various backgrounds: scientists, sports judges, coaches, etc. The first peak occurs at 25 years and is associated with IQ. The second peak occurs at age 39 when the worker is still relatively young and most experienced. As the starting point for calculating the KPI value, we take its average value depending on the age of the employees of a given enterprise. In the future, we will add (or subtract) values corresponding to the testing results and other secondary indicators to the basic KPI value. All test characteristics demonstrate the presence of an inflection point, where an excess of correct answers has just as bad an impact on the KPI as a lack. To calculate KPI, you need to add each factor separately to the basic KPI value from the age factor. This construction of the KPI model allows you to organize personnel work in advance in the direction of optimizing KPIs for both individual employees and the enterprise as a whole.