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iQube iQubeis an IT consulting company based in Lisbon, Portugal, specializing in accelerating its clients' digital transformation through intelligent and efficient technological solutions. The company focuses on three main areas of services: IT Outsourcing (providing scalable integration of experienced professionals), Project Implementation (custom software development, web, and mobile applications), and AI Consulting (helping organizations implement and optimize Artificial Intelligence strategies, from feasibility assessments to building predictive systems). iQube operates with a flexible, customer-centric approach, supporting both Portuguese national operations and international customers through a nearshore model. Senior Java Developer (Porto 2x office) We're looking for a Java Developer who thinks beyond the code. We want someone who doesn't just write Java — but truly understandswhy things work the way they do. Someone who knows the difference between aFactory and a Builder, understands when to useJPA vs JDBC, and can spot aperformance issue in a queryjust by looking at it. A developer who knowsSpring Boot,Spring Security, and exactly when to use a@Beanor a@PreAuthorize— not just because "that's how it's done," but because it makes sense. What we're looking for Strong experience withJava 8+andSpring Boot; Solid knowledge ofJPA/Hibernateand the ability to analyze and improvequery performance; Deep understanding ofdesign patterns(Factory, Builder, DAO, DTO); Experience building and maintainingREST APIswith clean and scalable architecture (SOLID, Clean Code); Familiarity withSpring Securityand access control best practices; Good communication skills andfluency in English. Nice to have Curiosity and willingness to learn new technologies; A critical mindset — someone who enjoys debating architecture and performance decisions; Experience working inAgile/Scrumenvironments. Location:Hybrid – Porto Language:English required If you're the kind of developer who doesn't just memorize answers — but understands them — this might be the right challenge for you.

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