This study investigates occurrences and tools of informal and non-formal learning at work, focusing on the Hungarian IT sector. The aim is to demonstrate that learning at work mainly manifests informally and to identify its patterns. Companies shifting towards teleworking during the pandemic further increased the importance of informal learning. The empirical research uses complex methodology of three pillars: A questionnaire about workplace learning conducted among employees in the IT sector (N = 162). Case studies of three Hungarian IT companies using questionnaires and semi-structured interviews. Learning activity logging of work-related learning events were recorded by participating employees (N = 19). According to the main conclusions there is a positive correlation between the number of available workplace learning opportunities and opinions on the efficacy of informal learning. Informal learning dominates the learning patterns of employees in a knowledge-intensive industry. In supporting employees' learning the average number of informal learning opportunities are significantly higher than those of formal learning and both employees and employers agree that this mode of learning is more effective. The results highlight that reinterpreting workplace learning is necessary due to economic, social and technological trends not to mention employer flexibility becoming more and more inevitable. Thus, the importance of informal learning is unquestionable.