Senior Java Developer

Summary

Join TechBiz Global and work as a Senior Java Developer for one of our top clients. This 6-month contract position offers the possibility of extension and a chance to grow within an innovative environment. The role involves designing, developing, and maintaining scalable Java-based backend applications using Java 11+, Spring Boot, and AWS. You will also be responsible for optimizing performance, ensuring high availability, and collaborating with German-speaking and Vietnamese team members. Strong expertise in Spring/Spring Boot, JPA/Hibernate, REST APIs, and AWS is required, along with experience in CI/CD and agile/Scrum environments. Excellent communication and team leadership skills are essential.

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

Responsibilities

• 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: Centralized monitoring via CloudWatch alarms
• 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