Senior Full Stack Developer (m/f/d) | DE + EN + FR/ES/IT

About HappyOps: HappyOps develops modern software solutions for medium-sized industrial enterprises in Europe. Our customers come from various sectors, including the glass, metal, plastics, and mechanical engineering industries. Together with them, we digitalize production processes and develop customized software solutions used daily in real factories. We are a profitable, bootstrapped software company with a fully remote engineering team. Our culture is characterized by personal responsibility, direct communication, and short decision-making paths. About the Role: We are looking for an experienced Senior Full Stack Software Developer (m/f/d) with business-fluent German and English skills, as well as very good knowledge (at least C1) in at least one additional language: French, Spanish, or Italian. In this role, you will not only develop software but also work closely with our international clients, understand their processes, and implement modern solutions for the manufacturing industry together with our team. You will accompany projects from initial requirements to productive deployment, combining technical excellence with pragmatic problem-solving. Responsibilities: Development, continuous improvement, and operation of custom software solutions for clients in the manufacturing industry. You own what you build ("You build it, you run it"). Implementation of complex business logic.