Najmuddin started his career as a youth player for Johor Darul Ta'zim. In 2022, he was promoted to Johor Darul Ta'zim II to compete in the MFL Cup.
For the MFL Cup, Najmuddin led Johor Darul Ta'zim II to become champion the 2024–25 MFL Cup. He scored his first hat-trick of the season after heading the ball in after finishing off Shahrul's pass in the penalty box to beat Haziq Mukriz. Johor Darul Ta'zim II won 7-0 over Penang II.[1]
For Malaysia U19, Najmuddin has also been selected to compete in the 2022 AFF U-19 Youth Championship. He has brought Malaysia win 2-0 over Laos in the final to be crowned champions for the second time at the Patriot Stadium.[3]
For Malaysia U23, Najmuddin participated in the 2023 Merlion Cup campaign held in Singapore. He successfully led Malaysia U23 to become the Merlion Cup champion and scored the opening goal for Malaysia with a header in the 74th minute. Malaysia U23 defeated Hong Kong U23 with a score of 2-1.[4]
Apart from that, Najmuddin was also selected for the 2023 SEA Games. Immediately after that, Malaysia U23 missed the opportunity to advance to the next stage and ended up in third place in the group.[5]
In his first debut, he was selected in the match against Timor Leste and Malaysia won with a score of 3-2 at Bukit Jalil National Stadium. In his second match, he was introduced in the second half to replace Jimmy Raymond in the 85th minute against Thailand.
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