Born in Loughrea, County Galway, to an English mother, Hoban played both hurling and football as a youth. He represented his town at hurling and Mervue United in football, who he helped to win promotion from the A Championship to the League of Ireland with a 5–2 aggregate victory over Kildare County in the 2008 play-off final. In July 2010, Hoban journeyed to England after being offered to train with Championship club Bristol City, managed by Steve Coppell and having just signed England international goalkeeper David James. In November he signed a one-year contract, along fellow 19-year-old Irishman Jimmy Keohane. He scored regularly for the Robins' reserve team but did not break into the first team, being loaned to local non-league team Clevedon Town before being released.
Dundalk
Hoban returned to Mervue United and then moved to League of Ireland Premier Division side Dundalk in 2013. In his first season at Oriel Park, he scored 15 times as the Lilywhites came runners-up to St. Patrick's Athletic; this included a hat-trick on 12 July in a 3–0 home win over Bohemians. He was top scorer with 20 goals as they won the 2014 title, their first for 19 years. On 24 July that year, he scored the winning goal in their 2–1 win away to Hajduk Split in the second leg of the second qualifying round of the UEFA Europa League, but they lost 3–2 on aggregate to the Croatians. The team also won the League of Ireland Cup with a 3–2 victory over Shamrock Rovers on 19 September, Hoban scoring their third goal to seal a first trophy in 12 years.
Following his release from Oxford, Hoban stayed in League Two and joined Mansfield Town in June 2016. He made his debut on 6 August as they began the season with a 3–2 win at Newport County, playing the final six minutes in place of Matt Green, and on 1 October he scored his first goal for the Stags, opening a 1–1 draw at Crewe Alexandra by heading Kevan Hurst's cross. On 10 January 2017, Hoban scored both goals in the final six minutes as Mansfield defeated Oldham Athletic in the third round of the EFL Trophy at Field Mill. He was released at the end of the 2016–17 season.
Return to Dundalk
On 24 November 2017 Hoban rejoined Dundalk. The following 11 February he played in the FAI President's Cup, a 4–2 home loss to Cork City, filling in for the last 23 minutes in place of Krisztián Adorján. On 19 July, in the Europa League first qualifying round second leg, he scored in a 2–1 win over Estonia's Levadia Tallinn. Hoban was voted League of Ireland Premier Division Player of the Month in June 2018 after scoring five goals in four games that month, including three in a 4–0 home win over Limerick on 8 June. On 5 October, he scored a late equaliser in a 1–1 home draw with St Patrick's Athletic to win Dundalk's 13th league title. He finished the season as top scorer with 29 goals but left the last league game injured, causing concern over whether he would play the FAI Cup Final against Cork City. On 9 February, Hoban scored as Dundalk defeated Cork 2–1 at Turners Cross to win the 2019 President of Ireland's Cup. He was sent off on 3 May in a 2–2 home draw with Derry City, after having scored twice. Dundalk retained their league title, and Hoban was the second highest scorer with 13 goals, one behind Junior Ogedi-Uzokwe of Derry. Dundalk also won the League Cup, with Hoban scoring four times in a 6–1 win over Bohemians in the semi-final on 19 August. Additionally, he scored the last goal of a 6–0 win over Northern Irish champions Linfield in the Champions Cup on 11 November. On 16 October 2019, Hoban signed a contract for two more seasons at Dundalk.
Career statistics
Honours
;Dundalk
League of Ireland Premier Division: 2014, 2018, 2019