Araujo previously played for Chesterfield in League Two last season.
Colchester's manager, Danny Cowley, is excited about the signing. He believes Araujo will bring technical skill and balance to the team.
Cowley also praised Araujo's intelligence on the field, saying he is a good reader of the game and will provide competition for places in the team.
Araujo expressed his enthusiasm for the new challenge. He sees himself as a leader who dictates the style of play and brings physicality to the team.
Araujo will have the opportunity to develop his skills and express himself in the team.
The U's will play away at Barnet on Saturday.