We here consider the relationship between workplace gender measures and employees’ perceived job quality, where the former cover both the gender mix of workers with the same job title and the gender of the immediate boss. Data from the 2015 European Working Conditions Survey show that men’s job evaluation is higher in gender-balanced job positions at the workplace, while that of women is higher in either gender-balanced or male-dominated positions. The gender of the immediate boss plays no significant role in employee job evaluation. There is some evidence that these correlations differ by job-quality domains. We introduce co-worker support and help, gender discrimination, and unwanted sexual attention as possible mediators of the gender-mix correlations: these change the estimated coefficients only little. Our estimated correlations could therefore reflect a pure preference for job-position gender composition. Last, we use a bounding approach to show that our main results are robust to the potential influence of unobservables. Overall, job-position gender diversity is associated with higher worker well-being.