As head of comms and tourism, Lewis oversaw PR for the city’s failed bid to become European City of Culture 2008 and handled fallout from media coverage of Bradford’s 2001 race riots.
A council spokeswoman said there were no immediate plans to recruit for her replacement.
‘The race riots are always something people want to talk about but we built Bradford’s profile back up from that,’ said Lewis.
She has joined Precise PR as director of marketing and communications to develop its public sector business.
At Bradford, Lewis led an eight-strong comms department for three years and reported to director of marketing and comms Owen Williams. In her new role, she will report to Precise PR chief executive Paul Pascoe.
Lewis said: ‘There are so many public-private partnerships and the commercial sector is beginning to realise the financial value of the public sector in terms of contracts.’
She added that her ‘inside knowledge of the bureaucracy’ of the public sector would help the agency handle the sector’s tendering processes.
Lewis kicked off her comms career at the now abolished Department for Education and Employment before moving to the Government Information and Communication Service. She then joined the Home Office as a press officer and then a publicity officer before moving to the Cabinet Office.
l Bradford City Council has brought in public sector specialist Harrison Cowley to promote a four-day international market.
The Union European Du Commerce Ambulant (UECA) market takes place at the end of August and will offer 350 stalls.
The campaign will target the regional press to attract visitors and stall holders.