Well, it wasn't an engineering office, but once-upon-a-time I performed an orderly shutdown of a small, heavy construction company - it took almost a year, working full time. It's mainly a business "project" so there should be a lot of similarities.
Here are my experiences and views:
1. Talk with your accountant to see if your (corporate?) structure would have value if sold outright. Other firms may receive a financial benefit by purchasing an ongoing company shell (complete with employees, minus you). If not, then...
2. Privately talk with any key employees who you want to stay on for a while. The same day tell EVERYONE in the company exactly what you plan to do. I guarantee you that the employees know more about the details of your business than you think they do - without information, rumors start. Some employees, may leave immediately, but you are probably better off without them anyway.
3. As soon as possible brief your customers/clients, suppliers, AND competitors - you want to help your employees get new jobs when the time comes.
4. Obviously, stop taking on new work. Complete existing projects in an orderly, professional manner.
5. As resources are no longer needed, get rid of them, hopefully by selling.
6. Be sure to continue the everyday administration of business matters (tax withholding, insurance coverage, bill payment, etc.)
7. As things come to a stop, do whatever it takes to help former employees get good jobs. I held a "job fair" on the final construction site and invited competitors to come interview employees. Remain available as a reference.
8. See your accountant to close out the books, file final tax return, cancel corporate charter, etc.
9. Distribute net proceeds to investors.
Doing this is a challenge, but has its rewards.
Best Wishes
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