Senior Java Backend Architect — Relocation & Visa Sponsorship

KWAN; Lisboa; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Relocation package & visa sponsorship

People Experience Partner

Learning & social events

Competitive benefits

Job summary

KWAN in Lisbon is seeking a Senior Java Developer to design and implement end-to-end backend solutions in a distributed environment. You will own core services, ensure scalability and high availability, and mentor teammates on architecture and best practices.

You will work with cross-functional teams, optimize performance, troubleshoot production issues, and contribute to technical documentation. 5+ years of Java/J2EE experience required; knowledge of SQL, JBoss, Spring Boot, Maven, and

Qualifications

• 5+ years of hands-on Java/J2EE development experience.
• Solid SQL database knowledge.
• Experience with distributed systems and high-availability patterns.

Responsibilities

• Drive end-to-end technical solution design for complex features.
• Own lifecycle of core backend services for scalability and resilience.
• Lead domain analyses and translate business goals into system specs.
• Mentor teammates on architecture, code quality, and testing.
• Troubleshoot critical production issues and optimize performance.
• Collaborate with cross-functional teams to meet milestones.

Skills

Java / J2EE

SQL databases

Distributed systems

Code quality / testing practices

Tools

JBoss

Spring Boot

Maven

JMS / Pulsar / Kafka / ActiveMQ

Job description

KWAN in Lisbon is seeking a Senior Java Developer to design and implement end-to-end backend solutions in a distributed environment. You will own core services, ensure scalability and high availability, and mentor teammates on architecture and best practices.

You will work with cross-functional teams, optimize performance, troubleshoot production issues, and contribute to technical documentation. 5+ years of Java/J2EE experience required; knowledge of SQL, JBoss, Spring Boot, Maven, and