Senior Java Developer

TechBiz Global GmbH; Düsseldorf; Vor Ort; EUR 60.000 - 80.000; Vollzeit

Zusammenfassung

TechBiz Global is seeking a Senior Java Developer for a 6-month contract with the possibility of extension. The role involves designing and maintaining scalable Java applications, optimizing performance in a cloud environment, and mentoring junior developers. Proficiency in Java 11+, Spring Boot, and fluency in German at a C1 level are required.

Qualifikationen

• 8+ years of commercial experience with Java.
• C1 German and B2 English for communication.

Aufgaben

• Design, develop, test, and maintain Java-based backend applications.
• Conduct code reviews and unit testing.
• Coordinate with stakeholders and collaborate with an offshore team.

Kenntnisse

Java

Spring/Spring Boot

JPA/Hibernate

REST APIs

CI/CD

AWS

Agile/Scrum

Jobbeschreibung

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At TechBiz Global, we are providing recruitment service to our TOP clients from our portfolio. We are currently seeking a Senior Java Developer to join one of our clients ' teams with 6 months contract with possibility to extend . If you're looking for an exciting opportunity to grow in a innovative environment, this could be the perfect fit for you.

Design, develop, test, and maintain scalable Java-based backend applications.

Write clean, efficient, and well-documented code using Java 11+ and Spring Boot .

Design and implement RESTful APIs and microservices architectures.

Optimize performance and ensure high availability of backend components.

Conduct code reviews, unit testing, and integration testing.

Troubleshoot and resolve complex technical issues across environments.

Participate in AWS infrastructure optimization and implementation:

Multi-account structure setup via AWS Organizations

Security hardening (IAM policies, SSM Secure Strings)

Deployment pipelines using AWS CDK and Infrastructure as Code (IaC)

Cost-efficiency strategies including Aurora Serverless , rightsizing, and savings plans

Work closely with DevOps/Cloud teams to ensure smooth CI/CD processes.

Coordinate and communicate regularly with German-speaking stakeholders ( C1 German required ).

Collaborate with offshore team members in Vietnam ( English B2+ required ).

Take initiative in planning, prioritizing, and delegating development tasks.

Provide technical mentorship to junior developers as needed.

Requirements:

8+ years of commercial experience with Java

Strong expertise with Spring/Spring Boot , JPA/Hibernate, REST APIs

Solid background in cloud-native development with AWS

Experience with CI/CD , Git, and modern DevOps workflows

German – C1 level (mandatory)

English – B2 level (for internal collaboration)

Strong communication, organizational, and team leadership skills

Experience working in agile/Scrum environments