The pair wrapped up their titles, Hauser, the 2014 winner, for the second time and Malowiecki her maiden championship at the Oceania Championships in Gisborne on Saturday.
Hauser, who left his home town Hervey Bay to move to the Gold Coast at the start of the year, won three of the four events, his only glitch coming when he snapped his bike chain at the Robina race in January.
The 18-year-old started the season with a victory in the Canberra race, before the mishap which saw him lucky to escape serious injury on the Coast and the back-to-back triumphs to take the Australian championship in Devonport and then his third Oceania title in Gisborne.
In the end Hauser took the title on 55 points from the WA's Liam McCoach (40pts) who stormed into contention with two outstanding efforts in Devonport and Gisborne with Hauser's training partners Kye Wylde (30pts) and Jack Van Stekelenberg (28pts) third and fourth respectively and last year's Youth champion Lorcan Redmond, forced out of Gisborne with a flat tyre, fifth (23pts).
Malowiecki dominated the Series – winning in Canberra, Robina and Devonport, before her fifth place to WA's Jessica Claxton in Gisborne.
The 18-year-old breaks the Hedgeland sisters four-year stranglehold on the title, providing the engraver with a new name for the first time since 2011.
Malowiecki finished the season on 45 points from Claxton (38pts), Ellie Hoitink, who was second in Gisborne in third on 37 points with Queensland's Leahy twins Elle and Zoe fourth and fifth respectively on 33 and 32 points.
In the Youth category it was SA's Charlotte Derbyshire who remained unbeaten through Canberra, the Gold Coast and the Australian Championship in Devonport to wrap up the Girls title on 33 points from QLD's Keely Whittaker (26pts) and WA's Abby Ouwendyk (25) with VIC pair Karolina Czajkowski fourth on 21 and Brooke McCullough fifth on 17pts.
The men's title went to exciting New Zealand prospect Dylan McCullough who was unbeaten through Canberra, the Gold Coast and Devonport to amass a maximum 33 points from QLD's Lachlan Sosinski (26), SA's Samual Tierney 25pts, VIC's Oscar Dart 23 points with NSW's Josh Ferris fifth on 20.
The top 3 placegetters will be invited to attend the Triathlon Australia Celebration of Champions Annual Awards Dinner on the Gold Coast in April to receive their series trophies.
Meanwhile the annual Trans-Tasman Triathlon Challenge (AUS v NZL), run in conjunction with the Oceania Championships saw the combined ACT/VIC team of Ellie and Grace Hoitink and Matilda Vidler win the Girls event from the two New Zealand teams, while in the boys it was the Kiwi foursome of Liam Ward, Dan Hoy, Trent Dodds and Bradley Cullen, who won the day over ACT/SA with Victoria third.
While the Australian (1) Team of Matt Hauser, Sophie Malowiecki, Kye Wylde and Zoe Leahy proved too strong for Australia (2) comprising Liam McCoach, Kira Hedgeland, Jonathan Sammut and Jessica Claxton with New Zealand foursome Trent Dodds, Katherine Badham, Liam Ward and Rose Dillon third in the OTU Oceania Junior Mixed Teams Triathlon Relay.
Craig Redman, Triathlon Australia's National Manager for High Performance Pathway, congratulated the athletes, saying he and Triathlon Australia is excited with the future.
"We have once again seen a very high standard of competition across the board from our Junior and Youth competitors in 2015 and 2016," Redman said.
"The quality and the quantity has been outstanding and there is no doubt the future of Australian triathlon is in very exciting hands.
"The athletes were outstanding but there is no doubt they could not have reached the start lines across three States and New Zealand without the support of their families, coaches, clubs and State associations.
"A select few of our Juniors will be named on the Australian Junior Team for this year's ITU World Championships in Mexico and on behalf of Triathlon Australia we wish the team every success."
2016 SCODY AUSTRALIAN JUNIOR TRIATHLON SERIES
1st Sophie MALOWIECKI QLD 45points
2nd Jessica CLAXTON WA 38points
3rd Ellie HOITINK ACT 37points
4th Elle LEAHY QLD 33points
5th Zoe LEAHY QLD 32points
1st Matthew HAUSER QLD 55points
2nd Liam McCOACH WA 40points
3rd Kye WYLDE QLD 30points
4th Jack VAN STEKELENBURG VIC 28points
5th Lorcan REDMOND NSW 23points
1st Charlotte DERBYSHIRE SA 33points
2nd Keely WHITTAKER QLD 26points
3rd Abby OUWENDYK WA 25points
4th Karolina CZAJKOWSKI VIC 21points
5th Brooke McCULLOUGH VIC 17points
5th Richelle HILL QLD 17points
1st Dylan McCULLOUGH NZL 33points
2nd Lachlan SOSINSKI QLD 26points
3rd Samuel TIERNEY SA 25points
4th Oscar DART VIC 23points
5th Josh FERRIS NSW 20points
ANNUAL TRANS-TASMAN TRIATHLON CHALLENGE (AUS v NZL)
1st ACT/VIC – 22points Ellie HOITINK Grace HOITINK Matilda VIDLER
2nd NEW ZEALAND – 32points Hannah KNIGHTON Eva GOODISON Olivia THORNBURY
3rd NEW ZEALAND – 34pointsJamie LEADER Ainsley THORPE Rose DILLON
1st NEW ZEALAND – 40points Liam WARD Dan HOY Trent DODDS Bradley CULLEN
2nd ACT/SA – 47points Callum McCLUSKY Liam SPROULE Luke BURNS Jack TIERNEY
3rd VICTORIA – 65points Jack VAN STEKELENBURG Kurt McDONALD Alex EVANS Noah DEUBEL
OTU OCEANIA JUNIOR MIXED TEAMS TRIATHLON RELAY
1st Australia (1) Matt HAUSER Sophie MALOWIECKI Kye WYLDE Zoe LEAHY
2nd Australia (2) Liam MCCOACH Kira HEDGELAND Jonathan SAMMUT Jessicah CLAXTON
3rd New Zealand Trent DODDS Katherine BADHAM Liam WARD Rose DILLON