This research assessed the effect of training and development by examining its impact on employee engagement, behaviour, and competence concerning employee performance at the Cooperative Rural Development Bank (CRDB) in Tanzania. It used Ilala and Kinondoni CRDB branches in Dar es Salaam, Tanzania, as a case study to represent other banks and other CRDB branches in Tanzania. The study employed a causal research design to collect primary data from a sample of 100 CRDB employees, all of whom had participated in training and development programs. Quantitative analysis was conducted to evaluate how the independent variables influenced variations in employee performance. The regression results indicated that increased employee engagement through training and development had an insignificant relationship with employee performance. However, improved employee behaviour resulting from training and development demonstrated a significant relationship with employee performance at CRDB Bank. Furthermore, at the 5% level of significance, the results showed a strong correlation between enhanced employee competence through training and development and employee performance. In conclusion, training and development programs provide employees with critical skills, including long-term thinking, which are essential for enhancing performance. The study recommends conducting a needs assessment before planning training programs