The lender, which recently said the rise in internet banking was behind a decision to close half of its branches in Edinburgh, said the specialist “TechXperts” would be in post by the end of April.
It will also give training to more than 1,500 branch staff, while customers who need support will be able access it over the phone.
RBS said more than 1.2 million of its customers regularly use online banking, with almost 900,000 using its mobile banking app.
Jane Howard, managing director of branch banking, said: “Banking is almost unrecognisable from what it was when I started my career in a branch 37 years ago.
“While more customers than ever before are taking advantage of the convenience and simplicity of mobile and online banking some people need further support.”