Senior Java Developer

TechBiz Global GmbH; Köln; Vor Ort; EUR 70.000 - 95.000; Vollzeit

Zusammenfassung

A recruitment firm is seeking a Senior Java Developer for a 6-month project in Köln. This role involves designing scalable Java applications, implementing cloud-native solutions, and mentoring junior developers. Candidates should have extensive experience in Java, Spring Boot, and AWS, with fluent German and English skills required.

Qualifikationen

• 8+ years of commercial experience with Java.
• Strong expertise with AWS cloud-native development.
• German C1 level and English B2 for collaboration.

Aufgaben

• Design, develop, and maintain Java-based backend applications.
• Implement RESTful APIs and optimize backend performance.
• Collaborate with DevOps for CI/CD and AWS optimizations.

Kenntnisse

Java

Spring / Spring Boot

REST APIs

AWS

CI/CD

Git

Agile / Scrum

Jobbeschreibung

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

Responsibilities:

1. Design, develop, test, and maintain scalable Java-based backend applications.
2. Write clean, efficient, and well-documented code using Java 11+ and Spring Boot.
3. Design and implement RESTful APIs and microservices architectures.
4. Optimize performance and ensure high availability of backend components.
5. Conduct code reviews, unit testing, and integration testing.
6. Troubleshoot and resolve complex technical issues across environments.
7. Participate in AWS infrastructure optimization and implementation, including:
   1. Multi-account structure setup via AWS Organizations
   2. Security hardening (IAM policies, SSM Secure Strings)
   3. Deployment pipelines using AWS CDK and Infrastructure as Code (IaC)
   4. Cost-efficiency strategies including Aurora Serverless, rightsizing, and savings plans
8. Work closely with DevOps/Cloud teams to ensure smooth CI/CD processes.
9. Coordinate and communicate regularly with German-speaking stakeholders (C1 German required).
10. Collaborate with offshore team members in Vietnam (English B2+ required).
11. Take initiative in planning, prioritizing, and delegating development tasks.
12. Provide technical mentorship to junior developers as needed.

Requirements:

1. 8+ years of commercial experience with Java.
2. Strong expertise with Spring / Spring Boot, JPA / Hibernate, REST APIs.
3. Solid background in cloud-native development with AWS.
4. Experience with CI/CD, Git, and modern DevOps workflows.
5. German – C1 level (mandatory).
6. English – B2 level (for internal collaboration).
7. Strong communication, organizational, and team leadership skills.
8. Experience working in agile / Scrum environments.