A crisis such as the COVID-19 pandemic has a tremendous impact on organisations and their employees. Building on the job demands–resources model, conservation of resources theory and the broaden-and-build theory of positive emotions, we examined the influence of job stressors on employee burnout, as well as how positive emotions can help employees thrive in tough times. We collected data from 503 Australian employees during the transition period of the COVID-19 crisis, when the country had reached a high vaccination rate and was starting to prepare to return to pre-crisis normal. Our findings show that financial insecurity has a direct impact on employee burnout, whereas a health threat has only an indirect effect. Further, our findings highlight the importance of positive emotions. Hope for the post-crisis future was found to buffer the negative impact of financial insecurity and reduce employee burnout, and feeling gratitude at work was found to mitigate the effects of burnout and enhance employee engagement even when employees are emotionally exhausted.