Den 27. august 2015 skrev Joronen under på en lejeaftale med [[Stevenage F.C.|Stevenage]] frem til januar 2016.<ref>{{cite news|title=Stevenage: Boro sign Jesse Joronen on loan from Fulham|url=https://www.bbc.co.uk/sport/football/34078392|publisher=BBC Sport|date=27. august 2015|access-date=21. oktober 2017|archive-date=22. oktober 2017|archive-url=https://web.archive.org/web/20171022110733/http://www.bbc.co.uk/sport/football/34078392|url-status=live}}</ref> Han fik sin debut for Stevenage to dage senere i en 1-1-kamp mod [[Dagenham & Redbridge F.C.|Dagenham & Redbridge]].<ref>{{cite news|title=Super sub Hitchcock strikes to claim point at Dagenham and Redbridge|url=http://www.thecomet.net/sport/football/super-sub-hitchcock-strikes-to-claim-point-at-dagenham-and-redbridge-1-4213810|publisher=The Comet|date=29. august 2015|access-date=21. oktober 2017|archive-date=21. oktober 2017|archive-url=https://web.archive.org/web/20171021192444/http://www.thecomet.net/sport/football/super-sub-hitchcock-strikes-to-claim-point-at-dagenham-and-redbridge-1-4213810|url-status=live}}</ref> Han scorede på en clearing mod [[Wycombe Wanderers F.C.|Wycombe Wanderers]] den 17. oktober 2015.<ref>{{cite news|url=https://www.independent.co.uk/sport/football/football-league/goalkeeper-jesse-joronen-scores-freak-long-range-goal-for-stevenage-from-just-outside-his-own-a6698206.html|title=Goalkeeper Jesse Joronen scores freak long-range goal for Stevenage from just outside his own penalty box|publisher=The Independent|date=17. oktober 2015|access-date=17. oktober 2015|archive-date=19. oktober 2015|archive-url=https://web.archive.org/web/20151019233530/http://www.independent.co.uk/sport/football/football-league/goalkeeper-jesse-joronen-scores-freak-long-range-goal-for-stevenage-from-just-outside-his-own-a6698206.html|url-status=live}}</ref> Han holdt målet rent for første gang den 7. november 2015 i en 3-0-sejr over [[Gillingham F.C.|Gillingham]] i første runde af [[FA Cup]].<ref>{{cite news|title=Stevenage 3 – 0 Gillingham|url=https://www.bbc.co.uk/sport/football/34685654|publisher=BBC Sport|date=7. november 2015|access-date=21. oktober 2017|archive-date= 4. august 2018|archive-url=https://web.archive.org/web/20180804173939/https://www.bbc.co.uk/sport/football/34685654|url-status=live}}</ref> Han pådrog sig dog en skade i denne kamp og vendte derefter hjem til sin modersklub.<ref>{{cite news|title=Yeovil Town preview: We have to be cautious but we are still going out to win this “six-pointer” says Teddy Sheringham|url=http://www.thecomet.net/stevenage-fc/yeovil-town-preview-we-have-to-be-cautious-but-we-are-still-going-out-to-win-this-six-pointer-says-teddy-sheringham-1-4310479|publisher=The Comet|date=13. november 2015|access-date=21. oktober 2017|archive-date=21. oktober 2017|archive-url=https://web.archive.org/web/20171021193107/http://www.thecomet.net/stevenage-fc/yeovil-town-preview-we-have-to-be-cautious-but-we-are-still-going-out-to-win-this-six-pointer-says-teddy-sheringham-1-4310479|url-status=live}}</ref> Ved hjemkomsten til Fulham F.C. skrev han under på en kontraktforlængelse frem til 2017.<ref>{{cite web|url=http://www.fulhamfc.com/news/2016/may/12/jesse-joronen-extends-fulham-stay|title=Jesse Extends Fulham Stay|publisher=Fulham F.C.|access-date=21. oktober 2017|date=12. maj 2016|archive-date=21. oktober 2017|df=|archive-url=https://web.archive.org/web/20171021193709/http://www.fulhamfc.com/news/2016/may/12/jesse-joronen-extends-fulham-stay|url-status=live}}</ref>
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