job search - How to show interest in a candidate when no positions are available?

I occasionally receive "cold-call" applications from graduate or postdoctoral candidates interested in working in my research group. Most of the time, they are of no interest—it's just a "form letter"-type application. However, once in a while, I get an application from someone who I would consider giving an interview to—if I actually had an open position.

What I want to do is to let people know that I am interested in such candidates, even though I don't have an open job for them. Is there a way to express this interest, and to encourage them to apply again when a new position becomes available. Is there a good way to do this—most of the time, such emails sound very trite, and that's exactly what I'm trying to avoid.

Answer

Being in the situation of looking for postdoctoral positions, I can at least give you my feelings of how I would understand that the person I contacted is interested, but cannot provide a position right now:

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  First of all, replying is already a good sign of interest. There are many persons who don't even take the time to answer to an official application for an open position (apart from the standard acknowledgement email), and you have to consider that you don't get the job if you don't hear from them. So, if you take the time to answer, that shows that you have at least a bit of interest

  
  


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  Then, if you provide a "personalized" answer, that shows that you took the time to read some of the applicant's papers, then it's clear that you are interested, and even if you can't provide a position, you might be interested in a collaboration.

  
  


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  The ideal would be if you can invite the applicant to give a talk, even though it's clear that there is no job following It would be a good opportunity for the applicant to talk about his work, to get some practice, meet new people, and that can also give you the opportunity to talk about creating a project together.

  
  

Basically, when one contacts a professor even though there are no official open positions, there are no really high expectations. But knowing that the professor is interested, but has no funding, is great, because it also opens the possibility to apply for a position in one year or two, when some funding is available. In order to show your interest, you can consider it as offering a potential collaboration: you can't provide money, but you would be glad to work with the applicant.