Järveoja began his co-driving career in 2006 and he tackled a selection of Estonian regional and national championship events alongside a variety of drivers in the following two seasons.
One of those was fellow Estonian Karl Kruuda, and in 2008 the pair began a long and fruitful partnership that took them to Junior WRC and IRC level in 2010, to WRC S2000 events in 2011 and 2012 and WRC 2 in 2013.
Järveoja most successful season to date came in 2014, when he and Kruuda finished fifth in WRC 2 after wins in Finland and Sweden. The pair managed only a handful of WRC 2 appearances in 2015 and 2016 and results were largely disappointing.
In 2017, a new opportunity with Estonia's highest-profile WRC driver, Ott Tänak, propelled Järveoja straight to the top level, as team-mates to world champions Sébastien Ogier and Julien Ingrassia at the M-Sport World Rally Team.
It proved to be a breakthrough year. Järveoja and Tänak claimed two rally wins and seven podiums and were duly snapped up by Toyota for 2018.