First you need to see their dedication for the work if they're working to help your company or he/she's just working for the money,
You should make an job hiring and post it online that's the fastest way to find one and you can choose from those applicant.
You can post it in social media where everyone is into webmarketing and there you can interview those who are interested for the job
And let say if their idea works they will get some bonus or let say a reward for making it.