CreateJob.cs

 private bool CreateJob(SPWebApplication site)
        {
            bool jobCreated = false;
            try
            {
                SPTImerJobClass job = new SPTImerJobClass(JobName, site);
                SPMinuteSchedule schedule = new SPMinuteSchedule();
                schedule.BeginSecond = 0;
                schedule.EndSecond = 59;
                schedule.Interval = 15;
                job.Schedule = schedule;
 
                job.Update();
            }
            catch (Exception)
            {
                return jobCreated;
            }
            return jobCreated;
        }