What are stem careers that work closely with cells?

Chemical engineering, bio/ biomedical engineering

There are so many, depends on the type of cells and what you want to be doing with them. You could work in a manufacturing lab growing vats of various cells for use in other labs or you could be a pathologist, virologist or microbiologist studying prokaryotic cells and pathogens or biomedical engineer or biochemist growing clumps of cells into tissue for skin grafts or organ transplant. You could be a molecular biologist and study/alter DNA of different types of cells or any type of drug, personal care product or chemicals are often tested on living cells for toxicology or efficacy puposes.