Where to begin... GSK as a company is an after thought among larger industry players, their pipeline is weak, they haven't experienced significant growth in decades, and recent acquisitions suggest poor purchases and capital allocation. Structurally, there is significant bureaucracy in this company that is a death knell to innovation and efficiencies, there are many layers of middle management with countless directors, associate managers, and other fancy sounding titles. I worked at for this company for many years and I still don't know what many of these positions did and many seemed either redundant or highly specialized. When it comes to hiring individuals, there seems to be an incredible lack of attention on meaningful skill and capabilities, and more emphasis on diversity and value... which frankly is so hypocritical because this company holds a record for one the largest fines in US history related to their marketing practices and integrity. Competitors seem to be bounding ahead and no one in the company that has any kind of important role seems to offer a strategy or solution. It becomes very tiresome to listen to these people talk, but never do. If you want an okay salary and you can be easily convinced of "great things to come", by all means give this company a go, but make sure to bring you Excedrin because you will quickly start wondering how any of the people running this circus got their roles.
If you do happen to end up working for this company, you will probably have two possible career paths. The most likely is a string of rejections, failed attempts, and being told how important you are without ever advancing. The less likely path is that the cohort of dunderheads see themselves in you, salute your perceived greatness, and usher you into their special club of world-changing disrupters that benefit from titles, but not brains. This company is so built on a foundation of nonsense that it will either implode or languish against its peers for future decades. If you end up working here, it will likely be just a job and not a career. You have yourself to blame if you choose to work here.