From time to time I find that I need access to deep technical expertise within a field for a small amount of time (couple of hours to a day maximum).

This could for instance be: - Code review of some critial parts of an application before it go live the first time. - Guidance on architechture decision in a certain proogramming language in the early stage of an project - Insights from someone that have worked in depth with a specific vendors system

Many of the questions can be answeard to some extent through articels/blogs/litterature as well as Reddit/Quora/etc. But often the possibility to ask detailed follow up questions and share material confidentially would be very valuable.

On the business side expert networks of this type exisits that are used during strategy and due dilligence projects (e.g GLG and Alphasight). But so far I have not seen any viable alternative for more technical questions.

Do anyone on else have this need as well? Have you found any good solution?