Business research: compile list of German privately hold small cap companies in the area of software development for the construction industry

Dear freelancers, I am looking for someone that is able to screen various industries from a financial/business perspective. I would like to test it with one exemplary industry. I would like to compile a list of private (not stock-listed) companies in Germany in the 1) construction industry with a 2) software or software-related business model (they develop software e.g. for architects or engineers that work in construction projects). I am looking for companies that have a revenue < EUR 50m with a German origin/headquarter. If it is a part of a larger group then it is not interesting to me, e.g. part of stocklisted company with majority shareholding, then I just need the name to complete the list, but no further details or time spend on it. The deliverable is an excel file (table) with the following columns: company name, revenue, ebitda (if possible), no. of employees, business model description, value proposition, type of customers/users, ownership type (e.g. family owned, investor-backed, part of larger group), website, city. I don't have any clue if there are 10 or 50 companies in this field, but I guess rather a small number.