This article examines side jobs among young people in Italy and Japan as patchwork trajectories rather than as isolated employment episodes. Drawing on open-ended survey responses collected within a larger comparative research project on youth, work, and wellbeing, the study identifies three recurring transition patterns: hospitality churn, multi-job portfolios, and study-aligned stepping stones. These qualitative patterns are analysed alongside quantitative indicators of stress and perceived risk, without making causal claims between them. Work-related stress is widespread in the sample, with 64.6 per cent of valid respondents reporting high or extreme stress levels. Perceived risks of precariousness and impoverishment differ markedly between the two national contexts: nearly one in two Italian respondents reports high risk on both dimensions, compared to fewer than one in five in Japan. The findings suggest that the boundary between formal and informal work is not a structural divide but a practical feature of the same trajectory, and that policy debates may benefit from attending to pathways of transition rather than to individual contracts in isolation. The study contributes to the sociology of youth work by offering a trajectory-centred, comparative reading of side jobs in two advanced economies.