In the contemporary digital era, organisations are increasingly challenged to attract, retain, and motivate talent while simultaneously embedding sustainability into their leadership practices. This research explores the synergy between employer branding, sustainable leadership, and employee performance within digitally transforming workplaces. Employer branding has emerged as a strategic tool to position organisations as employers of choice, while sustainable leadership emphasises long-term value creation, ethical responsibility, and stakeholder well-being. Together, these constructs influence employee engagement, productivity, and overall performance. Using a descriptive and analytical research design, this study integrates secondary data from peer-reviewed journals and conceptual models to examine how digital tools, social media platforms, and remote work environments reshape these interrelationships. A conceptual model—the Synergistic EB–SL–EP Model in the Digital Era—is proposed to illustrate the combined impact of employer branding and sustainable leadership on employee performance, moderated by digital transformation and mediated by engagement and trust. The findings suggest that organisations which align authentic employer branding with sustainable leadership principles experience higher employee commitment, enhanced performance, and stronger employer reputation. The study concludes that the integration of these three dimensions is essential for building resilient, future-ready organisations in the digital age.