Positive aspects of working at Medisys Innovation Pte Ltd include opportunities to learn new things, although these may be limited, and having friendly and helpful co-workers. However, there are several potential challenges raised, such as concerns about poor management, a lack of career progression opportunities, and the company downsizing, which could impact job security. Additionally, reviewers mention a lack of documented processes and standard operating procedures, and developers being expected to develop and support systems simultaneously, which could lead to a heavy workload.