Bad software developer

There are a lot of characteristic of bad developers, but we will stop on the most bad situation:

1. is smart (may be extremely smart), but ....

2. is confident a lot (and do not test code a lot), and...

3. loves to do better and better (even though it's not needed) 

4. loves to create perfect solution and do a lot of changes in the last minute

5. creates a lot of issues, but can to resolve them (and other people-managers think that he/she is hero)

6. he/she is technology lead or manager who continue do code changes. 

Any questions? 

Bad news: Managers often promote these people.... no comment