Infrastructure Developers at Thoughtworks Singapore work on building and evolving systems for client organizations, focusing on technical quality and effective ways of working to meet organizational needs. Responsibilities include driving technical solutions, shaping cloud and infrastructure practice, ensuring continuous delivery and evolution of infrastructure, and providing expertise in DevOps and cloud technologies. Qualifications include experience in enterprise hosting platforms, cloud and virtualization platforms, infrastructure automation, and application hosting technologies. Familiarity with DevOps philosophies, Agile methods, and Infrastructure as Code is required.