What does m/w/d mean in job postings?
m/w/d stands for männlich/weiblich/divers (male/female/other). Other alternatives are m/f/d (common for job postings in English) or any other variation (f/m/d, f/m/x, w/m/d, etc.) as to exclude männlich or male to be included in the first position. Any variation of this term is used to not discriminiate against any particular gender as that would be illegal.
In German, generally the job titles are specific towards a gender. Example: for a Software-Entwickler (Software developer) job, the job title could be written in any of the following ways.
Software-Entwickler und Software-Entwicklerinnen
To simplify, companies usually write the title as "Softwareentwickler (m/w/d)".