Java Developer for High-Impact Battery Project (On-site)

Contemporary Star Energy; Zaragoza; On-site; EUR 42,000 - 62,000; Full time

Benefits offered by this job

Transportation

Canteen

Discount programs (Vitaance, Stellanti

Job summary

Contemporary Star Energy in Zaragoza, Spain, seeks a Java Developer to design, build, and maintain robust, scalable applications. You will work with Java technologies, Spring, RESTful APIs, and modern CI/CD practices to support business needs and ensure security, reliability, and performance.

Requirements include a bachelor's degree in CS or related field, at least 3 years of Java experience, strong knowledge of Java/Spring/OOP, databases, and optional Docker/Kubernetes.

Qualifications

• Bachelor's degree in Computer Science or related field.
• At least 3 years of professional Java development experience.
• Strong knowledge of Java, Spring, OOP and design patterns.
• Experience with RESTful APIs and databases (MySQL, Oracle, PostgreSQL).
• Familiarity with microservices, Docker, Kubernetes and CI/CD is a plus.
• Agile/Scrum experience and strong analytical, teamwork skills.
• English proficiency at C1 level, both written and spoken.

Responsibilities

• Developing and maintaining Java/J2EE applications following standards.
• Designing and integrating RESTful APIs and microservices.
• Collaborating with stakeholders to translate requirements into technical solutions.
• Participating in code reviews, testing, and CI/CD processes.
• Optimizing performance, troubleshooting, and ensuring security and reliability.
• Maintaining technical documentation and contributing to architecture.

Skills

Java

Spring frameworks

OOP

Software design patterns

RESTful APIs

Agile/Scrum

English proficiency (C1)

Education

Bachelor's degree in Computer Science or related field

Tools

Docker

Kubernetes

Job description

Contemporary Star Energy in Zaragoza, Spain, seeks a Java Developer to design, build, and maintain robust, scalable applications. You will work with Java technologies, Spring, RESTful APIs, and modern CI/CD practices to support business needs and ensure security, reliability, and performance.

Requirements include a bachelor's degree in CS or related field, at least 3 years of Java experience, strong knowledge of Java/Spring/OOP, databases, and optional Docker/Kubernetes.