Anderson began her career in 1972 as a personal assistant to the editor of the Sunday Times business news and office manger. She then moved to working as a personal assistant to Labour Party MPs Barbara Castle and Jack Straw.
In 1987 Anderson moved to Central Lobby Consultants as a partner and associate director.
Since 2012 Anderson has been an associate consultant at Pandic Ltd and since 2015 the managing director of Pearson-Anderson Communications Ltd. Anderson's jobs were declared on her partner's Register of Members' Financial Interests due her being 'engaged in lobbying the public sector on behalf of a third party or client'.
- BBC News Rossendale & Darwen 2010 general election results, accessed 23 July 2015.
- Linkedin Janet Anderson, accessed 23 July 2015.
- Parliament Publications Register of Members’ Financial Interests as at 13 July 2015, accessed 23 July 2015.