From 2013 to 2016, he played with Global and scored the most goals in a single season after tallying 27 goals during the 2014 UFL season.[9]
Geylang International FC
On 10 June 2016, Geylang International announced on their Facebook page that they signed Hartmann from Global, making him the first Filipino to play in the S. League. He signed a short-term contract with Geylang that lasted until December 2016.[10] He debuted in a match against Albirex Niigata (S) at the 2016 Singapore Cup on 1 July 2016. He made 8 goals for Geylang in 11 appearances.[11] Geyland decided not to renew Hartmann's contract due to budgetary constraints[12] and clubs from Thailand, Malaysia, and the Philippines has expressed interest to sign him.[13]
Sarawak FA
He underwent trials at Sarawak in November 2016.[14] By 16 December, Hartmann signed a season-long contract with Sarawak. He scored his first goal for Sarawak against Kedah with a stunning free-kick. He scored hat trick against MISC-Mifa in Malaysia FA Cup.[12] He scored a total of seven goals from fifteen appearances, three in the league and four in the Malaysia FA Cup.[15] His contract was then terminated in May 2017.[16]
After his spell at Malaysia, he joined Thai League 1 outfit Ubon United.[18] He scored his first goal for Ubon United in a 3–1 away defeat against Nakhon Ratchasima.[19] In early May, after making 14 appearances and scoring five goals, he was one of five players released by the club.[20] He joined Ratchaburi after being released from Ubon United, reported in a FOX Sports Asiaarticle.
International career
In September 2011, he joined the Philippine national team training pool and was named in the final 20-man squad for the 2011 Long Teng Cup and the provisional Philippines under-23 squad for the 2011 Southeast Asian Games.[21][22] In the Long Teng Cup, he made his full international debut in the 3–3 draw against Hong Kong.[23]
He made his first appearance for the under-23 national team in the 3–1 loss against Vietnam in the opening match of the 2011 Southeast Asian Games.[24]
He is the youngest among the brothers Darren Hartmann, who has played for the Philippine U-21's during the 2005 Hassanal Bolkiah Trophy, and Matthew Hartmann, who was a Philippines under-23 and senior international footballer.[32]