These three companies were considered the happiest in Portugal and they are recruiting

PHC Software
Technological PHC Software is recruiting for several roles, some at the Porto offices. In total there are 17 vacancies open.
Junior developer, developer analyst, junior training consultant, front-end developer, support technician, UX designer, product manager, junior fiscal specialist, account manager, Scrum master are some of the open positions. Applications can be made here.
IT People
IT People is hiring and looking for candidates for the roles of junior java developer, devops, python developer, angular developer.
Learn more about these or other vacancies here.
Milestone
Milestone is also hiring and has open positions for SAP analytics consultant, successfactors consultant, senior ABAP consultant.
You can check open vacancies and apply here.