Can I use the logos of companies I worked for in my portfolio?

Just for aesthetic purposes I want to add the logo of the company I worked for near the paragraph where I talk about my work there. Same goes for a Stack Exchange or Dribbble logo, is that legal? I usually read about how you can't use logos in a way that it seems they are endorsing you, but is it using a stack exchange logo near a paragraph where I clearly state that I'm a member of the website classify as endorsement?