Senior Java Backend Engineer — Hybrid, Modernize Legacy

Siemens; Lisboa; Hybrid; EUR 60,000 - 80,000; Full time

Benefits offered by this job

Home office budget

Comprehensive health insurance

Learning platforms & mentorship

Job summary

Siemens Portugal in Lisbon seeks an experienced Java backend developer to build and modernize critical software solutions across international teams. You will refactor legacy components, optimize performance, and ensure security and quality throughout the application lifecycle.

Applicants should have a Bachelor’s in a technical field, 4+ years of Java experience, strong knowledge of Java EE, WebLogic/JBoss, and SQL databases. English is mandatory; occasional travel may be required.

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, IT, Engineering, or a comparable technical field, or equivalent relevant professional experience.
• 4+ years of professional Java development experience, with a strong backend focus.
• Strong knowledge of Java EE / J2EE applications and architectures.
• Experience maintaining and refactoring legacy applications.
• Strong knowledge of WebLogic and JBoss, including configuration, troubleshooting, and optimization.
• Solid SQL and PL/SQL skills, particularly with Oracle Database and PostgreSQL.
• Good understanding of TCP/IP communication and system integration.
• Experience with Subversion (SVN), Ant, Eclipse, and MagicDraw.
• Basic Windows administration and troubleshooting knowledge.
• English is mandatory, as you’ll work and communicate in an international project environment.
• Occasional travel may be required for project activities, workshops, or team collaboration.
• You’re someone who enjoys digging into complex systems and understanding how things really work.
• You combine technical expertise with ownership, curiosity, attention to detail, and a strong quality and security mindset.
• You’re comfortable working autonomously, but you also recognize that great software is built through collaboration and knowledge sharing.
• Experience with MES or manufacturing environments is a plus

Responsibilities

• Develop, maintain, and continuously improve business-critical software solutions.
• Understand existing applications, challenge the status quo, and identify opportunities for modernization and improvement.
• Refactor legacy components while protecting stability and business continuity.
• Investigate complex issues, identify root causes, and implement sustainable solutions.
• Ensure high standards for software quality, maintainability, security, and documentation.
• Support integration, deployment, and operational readiness across the application lifecycle.
• Translate business and functional needs into effective software solutions.
• Collaborate closely with developers, testers, architects, and project stakeholders across an international environment.
• Take ownership of your topics and proactively communicate progress, dependencies, and risks.
• Bonus: MES or manufacturing environments experience is a plus

Skills

Java development

Backend focus

Oracle SQL

WebLogic/JBoss

SVN & Ant

Eclipse

English proficiency

Education

Bachelor’s degree in Computer Science or related field

Tools

SVN

Ant

Eclipse

MagicDraw

Job description

Siemens Portugal in Lisbon seeks an experienced Java backend developer to build and modernize critical software solutions across international teams. You will refactor legacy components, optimize performance, and ensure security and quality throughout the application lifecycle.

Applicants should have a Bachelor’s in a technical field, 4+ years of Java experience, strong knowledge of Java EE, WebLogic/JBoss, and SQL databases. English is mandatory; occasional travel may be required.