In 2011, during the 23rd edition of the Lion City Cup in Singapore, Adam captained the NFA Under-15 team to 3rd place with victories over Newcastle U-15 and Juventus U-15. Adam then competed at the 2011 AFF U-16 Youth Championship, with the Singapore Under-15 team where they finished 4th, winning the tournament's Fair Play Award as Adam scored 5 goals to finish as top goalscorer. A year later in 2012, Adam and the Singapore Under-16 team finished in 2nd place with wins over Ajax U-15 and Vasco da Gama U-15, and a draw with Porto U-15, before losing eventual to champions Ajax U-15 in the final. Adam subsequently won the Singapore Under-16 Most Valuable Player award. Domestically, the Singapore Under-16 team won the Football Association of Singapore (FAS) U18 COE league with Adam winning the Most Valuable Player award.
In March 2012, Adam was chosen along with Muhaimin Suhaimi and four other students at the Singapore Sports School to undergo a ten-day training camp with the youth team of J.League club Albirex Niigata. Adam was the only one called back for a longer training session in August the same year as their U-18 head coach Nobuhiro Ueno was reportedly impressed by his control and one-touch passing, saying it was better than some of the players at the club's academy.
On 23 February 2013, Adam signed a two-year contract with Ligue 2 club FC Metz, joining their Under-19 set-up in the Championnat National youth competitions. He had impressed the staff and coaches during his 10-day stint at Metz following his 45-day European tour which includes training spells at illustrious clubs such as Newcastle United, Chelsea and Atlético Madrid. Despite offers of a one-year contract from Spanish club Atlético Madrid and Dutch club AFC Ajax, Adam chose to sign for FC Metz as he liked what he saw and experienced, and was impressed with the quality of its renowned youth academy. The FAS provided financial assistance to the tune of S$200,000 from its Football Development Fund for Adam's education in France.
Adam Swandi was nominally included in the 24-man Courts Young Lions squad which travelled to Turkey for a series of friendly matches in January 2014.
Adam signed for Courts Young Lions for the 2015 S.League season.
Adam scored his first career professional goal in a S.League match in a 1-2 defeat to Warriors FC.
Adam moved to Home United FC for the 2017 S.League season after leaving the Young Lions. He made his debut for the Protectors in the first leg of the AFC Cup qualifying match against Phnom Penh Crown FC, and scored his first competitive goal in the second leg, helping his team advance into the group stages. Coincidentally, his second goal came in Home's final game of the 2017 AFC Cup group stage, the last goal in a 4-1 routing of Yadanarbon F.C., sending his team into the zonal semi-finals.
In May 2013 Adam, was called up to the national squad by new Singapore national coach Bernd Stange for friendlies against Myanmar and Laos.
He made his first international appearance aged 17 years and 143 days when he came on as a second-half substitute in place of Indra Sahdan in the friendly against Myanmar on 4 June 2013. His first start came against Laos on 11 October 2013.
Adam earned his first recall into the national team in September 2015 in head coach Bernd Stange's 23-strong Singapore squad to take on Syria in their 2018 World Cup qualifiers but failed to make an appearance. As of December 2016, he remains capped only 4 times for the senior national team.
Adam was born to father Swandi Kitto and mother Hamidah Dasuki in 1996. His father was a former Singapore international striker in the 1980s. He started training under former Singapore goalkeeper Yaacob Hashim at the age of 4 with boys older than him.
Adam graduated from the Singapore Sports School in 2010.As of 18 April 2017
As of 18 April 2017
2012 Football Association of Singapore U18 COE league: Champions
2011 Hong Kong Youth Invitation U15 International Tournament: 1st(Champions)
2011 Hong Kong Youth Invitation U15 International Tournament: Fair Play Award
23rd Canon Lion City Cup: Bronze/3rd place(Semi-finalists)
2011 AFF U-16 Youth Championship: Fair Play Award
24th Canon Lion City Cup: Silver/2nd place(Finalist)
2011 Hong Kong Youth Invitation U15 International Tournament: Top Goalscorer Award
2011 2011 AFF U-16 Youth Championship: Top Goalscorer Award(5 goals)
2011 TNP-Dollah Kassim Award
24th Canon Lion City Cup: Singapore Under-16 Most Valuable Player
2012 Football Association of Singapore U18 COE league: Most Valuable Player