As a developer I work closely with my managers and designers etc to ensure that our project goes smoothly and that we create a good product. I don't necessarily decide what we build but I have a lot of ways to influence what we build and how.
We talk about stuff, we plan stuff, I chip in and people listen. Whenever I see devs complaining about how terrible their project management is I think to myself that the dev is probably at least partially responsible.
Maybe I'm just lucky to have good colleagues, but when I talk about software engineering topics people listen and take it seriously. I think that's a big part of our job as developers, we know the tech and we guide our managers just as they guide us. We're a team, we work together.