Usually, I see PhD offers announced on relevant mailing lists, e.g.: https://www.google.com/search?q=phd+position+site%3Ahttps%3A%2F%2Fmail.python.org&oq=phd+p

Usually, I see PhD offers announced on relevant mailing lists, e.g.: https://www.google.com/search?q=phd+position+site%3Ahttps%3A%2F%2Fmail.python.org&oq=phd+position+site%3Ahttps%3A%2F%2Fmail.python.org https://www.google.com/search?q=phd+position+site%3Ahttps%3A... Some PhD openings may not even be advertised, so politely asking (i.e. no generic spamming) existing students or faculty members is the only way to find out.