Probably not many. He used a buffer overflow exploit (found by someone else) to achieve arbitrary code execution (in a program not designed for security). That is not a trivial task (given the limited number of op-codes he was able to use), but not something that deserves job offers.

I think you overestimate how easy it is to hire people capable of overflowing buffers on their own initiative.

I think you underestimate how easy it is to exploit buffer overflows on systems with no exploit mitigations. Come back when you have ASLR and DEP running on the gameboy.