Kirkbride follows in the footsteps her husband Andrew MacKay who recently joined the lobbying arm of Burson-Marsteller.
Both Kirkbride and MacKay decided not to stand in the 2010 general election after it emerged that they had claimed second home allowances which were deemed to be inappropriate.
The pair, whose appeals were rejected during Sir Thomas Legg's review of MPs' expenses, were forced to repay £60,000.
Tetra Strategy is run by founders James O'Keefe, a former Labour Party staffer who went on to work for Bell Pottinger, and Lee Petar, one of the founding directors of BICOM (Britain Israel Communications Centre).
In a statement, Tetra Strategy confirmed that Kirkbride was joining on 'a consultancy basis'.
A spokesman said: ‘Julie brings a wealth of parliamentary experience having been Shadow Secretary of State for Culture, Media and Sport and serving on the Business, Innovation and Skills Select Committee and Energy and Climate Change Select Committee.
‘She also brings extensive knowledge of the print and electronic media having been a correspondent for the Daily Telegraph and a producer for the BBC and ITN.
‘Julie will enhance Tetra Strategy's already strong political diversity across the three main parties enabling us to offer the very best advice to our clients.'