My boss just called me and asked to write a email informing our clients to not to download the update we pushed this very evening because Application is crashing when you will open that particular page.

What went wrong? One of our senior Developer, let's call him Mr. X, is totally against of testing the app before deploying it to clients. He believes that as i have created the application, i know exactly what to change to accomplish a requested feature or bug in application.

When a ticket assigned to him about a bug in the application, he simply make some changes in code, create the package and send it to test department. How do I know? He even boast it in front of us.

Most of the time it works but not every time like today. And I am pretty sure my boss is not going to ask a explanation about this to him.

I have great respect for him. It's okay to have confidence but testing before sending it to anybody will not make you junior. Will it? Being a senior You are making others to be careless about his job.

That's what happen today. Mr. X failed so does the testing department. So am I. I am the head of testing department as well.

I am not blaming him. I just cant. It was our job to test app thoroughly. I am feeling pretty bad now. His confidence made me vulnerable. Say his confidence made me clearly a fool. Lesson has been learned though.