He signed with English Championship club Middlesbrough in August 2012, where he would play five games in two seasons before joining Shrewsbury Town in June 2014.

Blackburn secured promotion out of League One at the end of the 2017–18 campaign, though Leutwiler made just thirteen appearances in his three seasons at the club.

[8] But this experiment was broken off just a few weeks later as Sommer was loaned out to Vaduz, which led to Meili and Leutwiler returning to their parent clubs.

[9] Leutwiler then joined Basel's first-team under head coach Christian Gross for their 2007–08 season]as third goalkeeper behind Franco Costanzo and Oliver Stöckli.

[13] Then he spent the first half of the 2010–11 season out on loan at Wohlen, but was unable to hold the first-choice goalkeeper position, and returned to Basel early to again play in the U-21 team.

By now,in the Basel first-team, Sommer was number one, Costanzo was forced to leave, Stöckli retired, but youngster Mirko Salvi was up and coming.

[5] He was allowed a run of games in pre-season friendlies whilst established number one Jason Steele was with the Great Britain Olympic team.

[18] He made his league debut for the club on 10 August 2013, in a 1–0 win over Charlton Athletic at The Valley, replacing Steele for the last 12 minutes shortly after Lukas Jutkiewicz had scored the only goal of the game.

[19] A week later, with Steele still injured, Leutwiler made his first league start at the Riverside Stadium against Blackpool; he conceded after 83 minutes from Chris Basham, but Marvin Emnes scored an equaliser in added time.

[22] Leutwiler became the eighth summer signing to join newly-relegated Shrewsbury Town in League Two on a two-year deal on 11 June 2014, where new manager Micky Mellon was rebuilding the squad.

[32] Leutwiler continued in his role as first-choice goalkeeper at Shrewsbury until a back injury ruled him out of a home match against Blackpool in September 2015, ending a run of 54 consecutive starts in the Football League, losing his place to Mark Halstead.

However, he suffered concussion and facial injuries in a televised FA Cup second-round match at Grimsby Town in December, which saw Halstead deputise for him once again.

[35] With Shrewsbury avoiding relegation in their first season back in League One, Leutwiler signed a new contract in June 2016, keeping him at the club until the summer of 2018.

[40] He played the remainder of their cup campaign, a win over Crewe Alexandra on a replay, then a 1–0 loss to Hull City at Ewood Park in the third round on 6 January 2018.

[44] Following an unsuccessful trial at Accrington Stanley, Leutwiler joined League One club Fleetwood Town on 11 September 2020, where #1 Joel Coleman had recently suffered a severe hamstring injury.

[52] On 22 June 2021, Leutwiler joined League Two side Oldham Athletic, signing a two-year deal; manager Keith Curle had needed to build a new goalkeeping team at Boundary Park after the club were reliant on loanees the previous season.

[61] Manager Andy Crosby said that "we will be using his knowledge and personality to enhance our group", whilst director of football David Flitcroft noted that "we want drivers of standards and performance and that is one of Jayson's biggest attributes".