Twitter’s newly-minted engineering blog features a list of job postings, including three new listings for “Monetization” engineers. Cue speculative gossip among those of us interested in how Twitter will monetize its huge platform and make good on promises of the “fascinating,” “non-traditional” advertising program Twitter’s COO Dick Costolo announced in November 2009.

A selection of skills the Monetization team must possess:

• Experience in developing front-end advertiser applications
• Ability to implement statistical tools for improving relevance and yield
• Experience in mining and displaying data from a real time database

The job listings don’t reveal how exactly Twitter’s own advertising system might work or how large the team might be. All they do reveal is that Twitter is ready to get cracking on the next phase.

(That said, if you’re interested working on an advertising platform for Twitter, you should join us. We’ve built it already.)