A software engineer suing Twitter for sex discrimination says the company's mysterious promotions policy denies equal job opportunities for qualified women, according to court papers obtained Friday by Mashable — a document that handily alleges 10 personnel problems and five ways to fix them…Twitter's "engineering family" has eight distinct job titles…according to [Tina] Huang's lawsuit. But there is no published promotion criteria or application process…She says the policy — or really, lack of one — is why Twitter lags behind competitors in women at senior level, leadership, and management positions. She's seeking class-action status, inviting "all current and former female employees of Twitter denied promotions in the three years prior to the filing of this complaint" to join her… her filing suggests (demands, really) the following:…[A]dopting non-discriminatory and objective promotion standards…[C]reating a transparent and non-discriminatory job posting and application process…[I]nstituting an affirmative action policy to insure that women receive the share of Senior Staff Engineer and similarly-titled positions…