In July 2017, Jacob was part of India's gold medal winning 4 × 400 metres relay team at the Asian Athletics Championships.

The team of Jacob, Kunhu Muhammed, Arokia Rajiv and Mohammad Anas clocked 3:02.92, the season best time in Asia, to give India its first gold at the event since Seoul 1975.

[4] He competed in the 2020 Tokyo Olympics in the Men's 4x400 m relay event where the Indian team broke the Asian and National Records and clocked a time of 3:00.25.

[5] In 2021, Jacob won the gold medal in the 400 metres event at the 2021 Federation Cup Senior Athletics Championships.

[6] And finally he won a gold medal at the men's 4×400 metres relay event at the 2022 Asian Games.