Financial planning software company Midwinter has appointed William Yang as a senior developer. Yang has six years' experience in software development and for the last three years has been the technical lead on COIN at software company Rubik. A statement from Midwinter said that Yang's hire - as well as two other key hires announced - has come off the back of growth within the Sydney based firm, whose latest cloud based advice solution - AdviceOS has begun to experience "significant traction" in the institutional market.