Hiring a Json developer can be very tricky. One reason is because there are different levels of skills and it matters what you need to use your product for. You don't want someone who's not yet perfect but will get the task done, nor do you want an expert in one field when another skill would be better for your business. But whoever we find, they should have: Big data principles and methods (especially MapReduce), experience with NoSQL databases and distributed data processing frameworks such as Spark, Hadoop-compatible programming skills using Python or Java scripting languages.