Java Backend Developer, Madrid

Description

Job Summary: Join Upify as a Backend Engineer (Java) to develop and maintain new functionalities, evolve the existing platform, and participate in international projects. Key Highlights: 1. In-house product development, not consulting 2. Participation in international projects 3. Positive work environment and job stability Java Backend Developer At Upify, we develop and operate our own technological platform for managing and monetizing digital services within the telco ecosystem (mobile web stores, content, games, etc.), with presence in several countries. We are looking to hire a Backend Engineer (Java) to strengthen our team in Alcalá de Henares, working directly on our own product (not consulting). Your Responsibilities Development and maintenance of new backend functionalities Evolution and enhancement of the existing platform Development of unit and integration tests Optimization of processes and performance Clear and maintainable technical documentation Technical interaction with international integrators and operators Requirements +3 years of Java development experience **Experience in:** Spring Hibernate Servlets / JSP / legacy environments **Knowledge of:** Java multithreading testing (unit and integration) version control (Git / SVN) design patterns We value technical expertise and hands-on experience. A university degree is not required. Preferred Qualifications Microservices DevOps / continuous integration Agile methodologies (SCRUM) Technical English proficiency What We Offer Real project, in-house product (not consulting) Pure backend role (no frontend responsibilities) Participation in international projects Positive work environment Permanent contract Stability (no temporary projects) Conditions **Location:** Alcalá de Henares **Full-time (40h/week):** **Mon–Thu:** 9:00–18:00 Fri: 9:00–15:00 **Salary:** To be agreed based on experience Java, Servlets, Spring, Hibernate