A commitment to the client and the target audience. Not all client products will be to your liking, but it's important to respect the product and to make the end result the best possible it can be. Also, to recognize the needs of the target audience your client wants to reach and to ensure that the recipe works for the audience. For consumers, this usually means developing recipes using eight or fewer ingredients and preparation taking a half hour or less. Acute attention to detail.
Recipes are like scientific formulas.
In order to be able to replicate a dish successfully, it is essential to measure with accuracy and to write instructions accurately. Being a thorough proofreader also is a fundamental skill. Remember that for every test kitchen job, they are many, many applicants. There's no need to take on an inexperienced person and train them when experienced people already exist. So try to get experience writing or editing recipes by getting an internship in a test kitchen.