Over the years I've worked very closely with the Oracle Database Access Group and have a lot of respect for them. I'm happy to share that they are hiring C developers.
To apply, go to irecruitment.oracle.com and enter the code IRC2401606 or IRC2403582 (depending where you want to work) in the Keyword search box.
Here is an excerpt from the job posting:
The Database Access group at Oracle is responsible for providing
functionally comprehensive, reliable, high performance, secure and
highly available access to the Oracle Database from various client
drivers, including proprietary, standards-based and open-source
drivers. The group works on the high level drivers, the Oracle Call
Interface (OCI) layer, the Oracle wire protocol (TTC) and highly
scalable server side protocol handlers that together connect an
application written in any language securely to the Oracle Database
Server to provide full featured access to the Oracle Database.
Some of the listed requirements are:
Strong C programming experience.
I believe it when they also say "Work is non-routine and very complex, involving the application of advanced technical/business skills in area of specialization". Check out the postings for all the details. I look forward to working with you.
Addendum: IRC2401606 is also available.