There are certifying agencies. Including 1 for Data Processing professionals. However, most of us in the field could care less. 1 company I was with wanted to check out the tests they had. They had several senior people (I was 1) take tests in their field. The feedback was pretty consistant - the tests were not broken down into the correct brackets. They dumped the testing agency.
In another case I was required to take a "programming" exam as part of an interview process. Supposed to be generic questions without a language. I pointed out to the tester that 1 question had 2 different correct answers depending on a compile time switch in a language I was familiar with.
A couple of years ago, I got to help write a DB2 certification exam. The problem with that exam is that most people doing the actual work would do it with an open manual next to them, and IBM on the horn to answer questions, not closed book against a clock. (My assignment was 3 questions - 1 on each version of the exam). (A couple of the writers were people that then wrote study books for the very same test)
So the question of certification is who is qualified to write the tests? And how realistic are they?
Sorry, my best resume device is to list some of the things I have done to save companies money. The best 1 so far - found 1 line of code that was holding $10 million dollars of excess inventory. Close second - write a program from scratch and run it within 8 hours to avoid $4 million in IRS fines.