This study developed and field tested an electronic career guidance package for secondary schools, the e-Career Guidance System. The study was an educational research and development study and thus utilised the instrumentation research design. The formative evaluation of the developed programme was carried out using the pretest-posttest control-group quasi-experimental methodology. The researchers used the Students Career Awareness Questionnaire in collecting data for the experiment. The questionnaire was standardised, with a reliability index of 0.87. Sixty senior secondary two (SS 2) students were selected for the quasi-experiment using the purposive sampling technique. Thirty students were randomly assigned to the control group and the other thirty to the intervention group. The pretest and posttest data collected were analysed and used in testing the four null hypotheses in the study using analysis of covariance statistics. The results obtained showed that the e-Career Guidance System developed in this study produced a significant difference in the vocational self-awareness and career awareness of the sample in the experimental group in contrast to the sample in the control group. It was further observed from the analysis that gender did not interfere with the gains from the e-Career Guidance System. Based on these outcomes, the researchers concluded that the developed e-Career Guidance System has validity and could be used in the career guidance of male and female secondary school students in Akwa Ibom State and beyond.