A Platform Engineer designs, builds, and maintains scalable infrastructure to support software applications. They ensure stability, efficiency, and performance, playing a critical role in DevOps practices. Key responsibilities include cloud architecture design, automation, and monitoring systems. Required skills include proficiency in cloud services, scripting, and containerization. Collaboration with developers, system admins, and IT teams is essential. Career growth includes advancement to roles such as DevOps Architect or Site Reliability Engineer.