Employment contributes to well-being, yet many autistic people who want to work face barriers to meaningful employment. Much research focuses solely on employment rates, rather than taking a more holistic view of professional trajectories and occupational experiences. We conducted semi-structured interviews with 18 autistic adults to explore their experiences of, and perspectives on, career success. Our participants highlighted the overarching importance of finding fulfilment in one's career. Using reflexive thematic analysis, we identified five additional key themes: (1) volatile career journeys, (2) the need for continuing career support, (3) the impact (positive or negative) of social interactions, (4) the important role of organisations and (5) the catastrophic impact of poor experiences. Our findings highlight the importance of tailored, lifelong employment support and inclusive workplaces in enabling autistic people to thrive at work. Enabling autistic career fulfilment requires moving beyond entry-level hiring to foster sustainable, fulfilling employment for all autistic people.