Invopop is seeking a Graduate Product Engineer in Madrid to take ownership of applications from research to production. This role involves designing backend integrations in Golang and collaborating closely with customers to enhance product functionalities. Candidates should have a degree in Computer Science or Telecommunications Engineering, be fluent in English, and possess a builder mindset. A competitive compensation package of €45k base salary plus Employee Stock Options is offered, with expectations for in-office work 4-5 days/week.