I was thinking about the problems one of our clients faced with the launch of their project the other day, because things were rushed, stuff was omitted and in the end they could not meet the launch date, and I started making a list of hard lessons I learned over the years that would have helped them avoid this situation.

Feel free to add yours in the comments.

- Never deploy on Friday
- Never make infrastructure changes right before a launch
- Always have backups. Always!
- Version control is never optional
- A missed deadline is better than a failed launch
- If everything is urgent, nothing is important
- Fast and cheap, cheap and quality, quality and fast. Only one pair at a time can be achieved
- Never rush the start or the end of a project
- Stability is always better that speed
- Make technical decisions based on the needs of the project two years from now
- Code like you will be the only maintainor of the project two years from now. You probably will...
- Always test before you deploy
- You can never have too many backups (see above)
- Code without documentation is a tool without instructions
- Free or famous does not necessarily mean useful or good
- If you need multiple sentences to explain a method, you should probably refactor
- If your logic is checked beforehand, writing the code becomes way easier
- Never assume you understand a request the first time around. Always follow up and confirm

There are many more that should be on this list, but this is what came to mind now.