Quality teaching, being a key factor in shaping students' academic and personal growth, has been at the centre of scientific debate for many years. Sustainable professional development of novice teachers has recently been recognized worldwide as one of the key areas for improving the quality of teaching and learning in schools. Given that the initial years on the job are generally characterised by novice teachers as the most challenging and intense in their career, the following questions typically arise: What can be done to sustain and facilitate teaching at the early developmental stages in teachers' career? What are the contextual factors and the prerequisites leading to the quality of teaching and learning? The article presents the findings from a two-year longitudinal qualitative study aimed to contribute to the research base for understanding this crucial stage. More specifically, the purpose of this study was to provide deeper understanding and insights into key factors influencing and shaping novice teachers' early professional development and learning, as well as their capacities to effectively adapt to their new roles and operate in complex and dynamically changing open-ended school environment. The research is framed as a cross-case analysis of 4 cases of novice teachers working in public secondary schools. The data were collected through multiple sources (i.e. semi-structured in-depth interviews, questionnaire, and focus groups) over a two-year period spanning the participants' first and second full-time teaching years. Substantial differences in experiences and beliefs among the novice teachers, with varying levels of job satisfaction and professional support received, were identified in the study. The authors have also identified numerous patterns of novice teachers' teaching practice closely associated with teachers'concerns and early professional experience interpretations, which might result in substantial fluctuation in teaching quality and teacher's career paths. Implications for teacher education programs, mentoring, supervision, teachersí professional development, and future research are discussed.