pointer arithmetician (idea by someone at Apple)

problemist

optimizationeer

abstractionist

algorithmist

encryptioneer

languagician

recursionist

infinite looper

object orienter

continuationeer

{Python,Perl,Ruby,Bash,Lua} scriptician

thread commander

multicore general

concurrencician

parallelista

polygoneer

regular expressionist

data baseist

assemblician

formalisationist

daemonologist

pattern matchician

computational theologist

mallocateur

hashonomer

Of course you can prepend a 'Chief' or insert some department prefix, like software, compiler, graphics, etc.

And some more, not so suited for business cards:

pointer dereferencista (not as cool as the arithmetician)

incrementer, token carrier, exceptioneer, template instantiator, connection dropper, merge sorter (sounds boring)

y combinatorian (single letters look ugly)

lazy evaluationist (i do not want 'lazy' on my card)

flux compensatorian, cybermancer, technomancer (nice, but fictional origin)

software gardener, cloud mechanist, software artificer (nice, bot not a neologism)

Discussion on reddit Discussion with more ideas on Google+