Senior Java Developer

TechBiz Global GmbH; Darmstadt; Vor Ort; EUR 65.000 - 85.000; Vollzeit

Zusammenfassung

TechBiz Global GmbH is seeking a Senior Java Developer for a 6-month contract with the possibility of extension. In this role, you will design and develop scalable backend applications, conduct code reviews, and collaborate with teams to optimize AWS infrastructure. Strong experience with Java, Spring Boot, and cloud-native development is essential, along with proficiency in German (C1) and English (B2).

Qualifikationen

• 8+ years of commercial experience with Java.
• C1 level German required for communication.
• B2 level English for internal collaboration.

Aufgaben

• Design, develop, and maintain Java-based backend applications.
• Implement RESTful APIs and microservices architectures.
• Optimize performance and troubleshoot technical issues.

Kenntnisse

Java

Spring/Spring Boot

Cloud-native development

CI/CD

Git

Agile/Scrum

Communication

Team leadership

Tools

AWS

JPA/Hibernate

AWS Organizations

AWS CDK

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