Methods, systems, and apparatus, including computer programs encoded on computer storage media, for ranking developers. One of the methods includes obtaining data representing a plurality of developer actions for a developer, obtaining a net violation baseline for the code base, wherein the net violation baseline represents a measure of violation introductions compared to violation removals by a typical high-productivity developer of the code base, obtaining a developer action baseline for the code base, the developer action baseline representing a number of developer actions for the typical high-productivity developer of the code base. A net violation value and a developer action value are computed for the developer. A score is computed for developer including comparing the sum of the net violation value and the net violation baseline to the sum of the developer action value and the developer action baseline. The developer is ranked relative to other developers by the score.