Has anybody ever interfaced irec with external sites?
Is it very complicated?
Any pointers to relevant documentation will be useful.

Creating and Maintaining Recruiting Sites Details

If your enterprise has an agreement to post job advertisements with third-party
recruiting sites, use the Job Posting Vendor Details page to record information about
the recruiting sites.
Complete the following information:

1. Enter the recruiting site name that identifies the third-party recruiting site where
your enterprise posts the job details.
2. Depending on the data transfer method that your enterprise uses, enter the following
details:
• To send job postings through HTTP, enter the Posting URL specified by the
recruiting site. Enter the user name and password to track those who submit
job postings to the recruiting sites. To base the user name or password on the
manager or recruiter who submits the posting, enter one of the following
parameters. The application dynamically includes the appropriate details for
the person when the posting is made:
#USERID
Sends the person’s unique user ID as assigned by the application, for
example, 10569.
#USERNAME
Sends the person’s Oracle Applications login name, for example, JDOE.
#EMAIL
Sends the person’s e-mail address, for example, john.doe@abc.com.
• To send job postings through e-mail, enter the receiver’s address as the
Posting URL. Enter the address in this format: mailto:{email address}, for
example, mailto:firstname.lastname@company.com.
• To send job postings using FTP, enter the username and password to enable
the manager to post job details to the FTP server. Specify the Posting
URL as FTP URL with the directory that stores the job postings. For
example, ftp://fptserver.mycompany.com/inbound_postings.
Note: You can use the FTP method only if the destination
server supports Passive File Transfer Protocol (PASV) data
transfers. The FTP feature is a beta version and may not work
on all servers.
3. Specify the style sheet that defines the job-posting format. By default, iRecruitment
sends the job posting details in the HR-XML JobPositionPosting format. If you use
the default JobPositionPosting.xsl stylesheet, then you must leave the Stylesheet
field blank. To send the job postings in a format other than the default HR-XML
format, enter the name of the style sheet.
4. Provide other details:

• Provide the Date From and Date To information to specify how long your job
advertisements appear on the recruiting site.
• Enter the posting cost of the job advertisements for the specified period.

Also, it includes the DMZ Configuration:
Oracle E-Business Suite R12 Configuration in a DMZ [ID 380490.1]

DMZ : The DMZ, which stands for DeMilitarized Zone consists of the portions of a corporate network that are between the corporate intranet and the Internet. The main benefit of a properly-configured DMZ is better security: in the event of a security breach, only the area contained within the DMZ is exposed to potential damage, while the corporate intranet remains somewhat protected.

This document describes methods for making a subset of Oracle E-Business Suite Release 12 functionality accessible via the Internet to external users. May be also for 3rd party websites.. am not sure yet.. just find out..

Thanks,
Navya

Has anyone ever implemented this previously?

How have people completed the mapping of your own internal categorisations to the external job site categories?

The seeded functionality seems to give you the ability to generate an XML file from a limited set of data, but not any conversion options or options to use additional fields.

Cheers