Filling a position of an employee that performed critical work for a project can be very challenging. This is especially because he/she is probably an expert in the tasks they perform for the project and know the most about whatever they’re doing. A solution could be trying to find someone on their same team that can take on the work they have been doing. For example, at my company, there was an employee on my team that was an expert in python coding. He was working on a big project that used python. Mid-project, he received an offer from another company and left. Our manager was struggling to find someone to replace him. But she quickly realized that by getting the people that were familiar with his work together they can piece together a temporary solution. So two of the employees that worked closely with him teamed up and took on the rest of the work he left behind. By piecing together their small knowledge, they were able to complete his part and the project moved on with little impact with respect to time.