Tech companies cover up their hard edges with a wide range of dubious management techniques.

hard edges 是根据具体语境翻译的，“坚硬的边缘”比喻“生硬的待人方式”，还可比喻“矛盾”。例如：

But the simple repetition of cooking and eating brings the family together, softening the hard edges like boiling water on rice.

不过烹调和用餐的简单惯例能让一家人聚在一起，软化矛盾，就像沸水煮大米一样。

《经济学人-文艺》

这不是英语学习的主流和重点，可以忽略此问题。建议网友不必纠结。