[hueving]

The job might not be that bad. It just depends on what you find intellectually stimulating. The actual algorithm for selecting ads probably won't be what you get to work on. Ad engineer jobs are quite frequently focused on making tooling for the buyers to slice and dice data in lots of different ways to analyze the results of a campaign.

By all means, if it's a good company I would highly suggest taking the job. A job at Facebook or Google for a year working as an ad engineer is still going to be a much better experience than most 'enterprise java' positions at a non-tech company.