Born in San Luis Obispo, California, to an English mother and an American father, Rachubka possesses dual nationality, having moved to England with his family when he was seven years old.

The 2001–02 season saw Rachubka go on a three-month loan to Manchester United's Belgian feeder club Royal Antwerp, followed by six months with Oldham Athletic.

At the end of the season, Manchester United received a £200,000 bid for Rachubka from Charlton Athletic, and he left the club without having conceded a goal in any of his three appearances.

After failing to dislodge Dean Kiely in his two years at Charlton, Rachubka was loaned out five times, all in 2004; firstly to Burnley in February, then from March to the end of the 2003–04 season he was at Huddersfield Town.

Rachubka was sent on loan to Peterborough United as cover for Mark Tyler and played four League Two matches over the Christmas and New Year period of 2006–07.

[9] On 2 April he was named in the Press Association's League One "Team of the Week", alongside Blackpool teammate Wes Hoolahan, for his performance in the 2–1 win over Crewe Alexandra.

[11] Blackpool's other 'keepers, Rhys Evans and Lewis Edge, also picked up concurrent injuries, which led to Seasiders boss Simon Grayson bringing in Manchester City's Joe Hart on loan as an emergency stand-in.

[15] Following his performance in Blackpool's 2–0 win over Peterborough United on 26 September 2009 at Bloomfield Road, Rachubka was named in The Championship "Team of the Week".

[21] Manager Ian Holloway said it was an error not to have named Rachubka in his initial 25 man squad for the first half of the season.

[34] However, Rachubka made three errors in the first 30 minutes against his old club Blackpool which put Leeds 3–0 down, before being substituted at half time for rookie goalkeeper Alex Cairns.

[35] Manager Simon Grayson reacted by signing Reading goalkeeper Alex McCarthy on loan and revealing Rachubka was going to be taken out of the team for a few weeks to rebuild his confidence.

[42] On 1 December 2012, Rachubka joined Accrington Stanley initially on a week-long emergency loan basis due to an injury sustained to first choice goalkeeper Ian Dunbavin.

[49] After establishing himself as the number one goalkeeper towards the end of the season ahead of Mark Oxley, and a string of excellent performances, Rachubka was rewarded with a new one-year contract extension.

[53] He made his debut for the Wanderers on 16 January 2016, when coming on as a 12th-minute substitute for midfielder Josh Vela in a 3–0 defeat against Nottingham Forest at The City Ground after Amos had been sent off for a foul on Jamie Ward.

[55] After spending a season with Bury following his release by Bolton, Rachubka signed for Indian Super League side Kerala Blasters in August 2017, linking up with former Manchester United teammate Wes Brown.