This study examines the associations of career development and career adaptability with internship performance and assesses whether work readiness functions as an intervening mechanism among Generation Z university students in Indonesia. Design/methodology/approach – A quantitative cross-sectional survey was administered online, and the submitted manuscript reports 257 responses analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) in SmartPLS 4. Because the original respondent table contains inconsistent status coding, all inferential results should be treated as provisional until the raw sample is re-verified and the model is rerun. Findings – The supplied structural output reports positive direct coefficients for career adaptability to internship performance (β = 0.279), career adaptability to work readiness (β = 0.200), career development to internship performance (β = 0.166), career development to work readiness (β = 0.262), and work readiness to internship performance (β = 0.184). The reported indirect coefficients are β = 0.037 for career adaptability through work readiness and β = 0.048 for career development through work readiness. Exact bootstrap 95% confidence intervals were not included in the supplied output and must be verified before final mediation decisions are stated. Conclusion – The current estimates suggest that career development and career adaptability are related to internship performance both directly and through work readiness, although causal claims are not warranted by the cross-sectional design. Contribution – The study’s contribution lies not merely in positioning work readiness as a mediator, but in distinguishing career development activities from career adaptability as separate career resources and examining how each may be converted into internship performance through work readiness.