At Grammarly, we found some data to back this up. We studied 100 LinkedIn profiles of native English-speakers in the consumer packaged goods industry, and each of the professionals we looked at worked for no more than three employers over the first 10 years of their career. Half were promoted to director-level or above within those 10 years, and the other half were not.
We discovered a correlation between the number of grammar and spelling errors in a profile and the trajectory of that person’s career. Here are some of our study's main takeaways...
Bad grammar on LinkedIn profiles makes me wince.