In all of my experience as a Software Developer that has worked with teams, having technical Skill is important but Soft Skills are the most important.
Soft skills are individual personality traits that determine whether you will work well with your colleagues and be a good fit at a company. These are intangible but extremely important for almost every kind of position.
Soft skills include things like good communication, honesty, teamwork, punctuality, integrity, and organization.
I'd run through Various soft skills that are essential for developers in this talk