PurposeTo cope with intensifying uncertainties coupled with the rapid advancement of information communication technology (ICT), understanding how to encourage employees' innovative workplace behavior (IWB) is imperative, with two motivational concerns: (1) the possession of critical knowledge resources characterized by intellectual capital (IC) to better reconfigure new and existing knowledge and (2) the development of career sustainability to handle ICT-enabled intricate job arrangements. The authors investigate the relationships among IC, career sustainability and IWB in Chinese cross-border e-commerce enterprises (CEEs), which are becoming increasingly prevalent and central to the global economy.Design/methodology/approachUsing data collected from 417 participants employed in Chinese CEEs, the authors used regression analyses to test the authors' hypotheses.FindingsHuman capital (HC) and structural capital (SC) exerted inverted U-shaped influences on IWB, while relational capital (RC) was positively related to IWB. Perceived career sustainability positively moderated such associations between HC and IWB and between SC and IWB; perceived career sustainability negatively moderated the positive RC-IWB relationship.Practical implicationsResults can inform managers which components of IC and how managers are related to IWB so crucial for success of CEEs with ICT-enabled, intricate architectures of knowledge exchange. The authors' results can help global managers and policymakers to more appropriately allocate scarce knowledge resources to maximize innovative behaviors in the highly competitive international business context.Originality/valueFrom the knowledge-based view (KBV) of firm innovation, the authors examine the differential effects of IC components on employee IWB amid coronavirus disease 2019 (COVID-19) through a novel lens of employees' perceptions of career sustainability, enriching the literature at the intersection of IC, knowledge management (KM) and career development. The authors' cross-level analysis links micro-level variables to organizational IC in the new normal.