With the number of publications being all-time high, academic peer review is imperative to ensure high-quality research content. The wider involvement of postgraduate, early-career researchers (ECRs) has been proposed on several platforms to address the unsustainability of the peer review process caused by a lack of peer reviewers. A survey involving 1203 academics and ECRs in ten countries revealed their attitudes towards the involvement of ECRs in the peer review process. The trends and motives were identified, with emphasis on the peer review being an oft-neglected tool in the skill development of ECRs. In light of the survey results, the transferrable skills that ECRs acquire from performing peer reviews at a crucial stage in their career development are systematically explored. The findings call for further engagement of ECRs in the peer review process under supervisory mentoring.