I was in the same position about a year ago. I spent about three years at a company, it was my first real job and the members of my team were not just colleague

I was in the same position about a year ago. I spent about three years at a company, it was my first real job and the members of my team were not just colleagues, but also friends. But then a really good opportunity came up and I decided to leave. I just walked up to my boss and told him about the offer that I got. He asked if there was anything they could do to keep me, but the fact was they'd never be able to top the offer I got. So, I guess, my advice would be: 1. Be honest. 2. Notify your boss well ahead of time. Finish up your work. 3. If possible, write some docs and train other employees. I happened to be the only guy maintaining a certain system, so before leaving I made sure the knowledge was shared with the team members, wrote checklists of what to do in emergency situations, etc. 4. I don't know if it's appropriate in your office, but if it is, throw a good-bye party, preferably with some alcohol. When is the next time you'll get to drink with your work buddies? :) Note that it may seem like a lot of work to finish up projects, write docs and train others. It is. Fortunately, I had plenty of time between the offer and actually leaving my previous job, but that was because the new employer had to do some visa work. Your situation might be different, though, but even if you don't have much time, try to squeeze in as much as possible. It's more a courtesy to your teammates rather than a favor to the company.