Senior Java Developer

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Qube IT Consulting

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Qube

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Qube is 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). i
Qube operates with a flexible,
- centric approach, supporting both Portuguese national operations and international customers through a nearshore model.

We’re looking for a Java Developer who thinks beyond the code.

We want someone who doesn’t just write Java — but truly understands why things work the way they do.

Someone who knows the difference between a Factory and a Builder, understands when to use JPA vs JDBC, and can spot a performance issue in a query just by looking at it.

A developer who knows Spring Boot, Spring Security, and exactly when to use a @Bean or a @Pre
Authorize — not just because “that’s how it’s done, ” but because it makes sense.

Responsibilities and Qualifications

• Strong experience with Java 8+ and Spring Boot
• Solid knowledge of JPA/Hibernate and the ability to analyze and improve query performance
• Deep understanding of design patterns (Factory, Builder, DAO, DTO)
• Experience building and maintaining REST APIs with clean and scalable architecture (SOLID, Clean Code)
• Familiarity with Spring Security and access control best practices
• Good communication skills and fluency 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 in Agile/Scrum environments

Location

Hybrid – Porto

Seniority level

Mid-Senior level

Employment type

Full-time

Job function

Information Technology

Industries

IT Services and IT Consulting