Are you experienced in cloud infrastructure and container orchestration? Would you like to take responsibility for our high-availability infrastructure as a committed professional? Do you enjoy collaborating closely with development teams to ensure the optimal operation of our mobile ticketing platforms in public transport? If you want to actively drive digital transformation, we are excited to meet you! We are the market leader for digital ticketing solutions in public transport in Germany and part of Siemens Mobility- With over 130 brilliant minds, we develop smart solutions that make ticket purchasing easier – for passengers and transport companies alike. Our goal: sustainable, connected mobility that makes private car use obsolete. You manage, maintain , and optimize our Kubernetes clusters to ensure smooth and high-availability operations of our containerized applications. This also includes orchestrating Docker containers and implementing best practices. You conceptualize, implement, and manage our cloud infrastructure on Amazon Web Services (AWS). This involves extensive work with services like EKS, RDS, EC2, S3, WAF, and Advanced Shield to build robust and secure environments. You advance the automation of our infrastructure through the development, maintenance, and extension of Infrastructure as Code ( IaC ) with tools like Terraform, Ansible, and Puppet (or Chef). You automate recurring operational tasks and processes using Bash scripts and Python for maximum efficiency and consistency. You ensure the stability and security of our system and network landscapes, analyzing and resolving complex issues while performing maintenance tasks at our Hamburg site. You implement and monitor cloud security principles to protect our data and systems from unauthorized access and cyber threats. You collaborate closely with our software development teams, advising on infrastructure-related questions and providing optimal operating environments for their applications. You conceptualize and prioritize cloud-based solutions together with your team to fulfill internal and external customer requirements. You are actively involved in the operation and administration of our GitLab instances. You participate in the on-call duty rotation to ensure the 24/7 availability of our critical infrastructure systems. You communicate clearly and professionally with internal teams and external partners. Experience as a Kubernetes Administrator in high-availability environments. Certified Kubernetes Administrator (CKA) certification is desirable. Expertise in cloud-based application deployments on Amazon Web Services (AWS), especially with services like EKS, RDS, EC2, S3, WAF, and Advanced Shield. Experience applying and designing Infrastructure as Code ( IaC ) with tools like Terraform, Ansible, and Puppet (or Chef). Willingness to take on-call shifts in rotation with colleagues (24/7 on-call support). Proficient in Bash and Python for automating recurring tasks. Strong understanding of the ISO-OSI model, network protocols, and basic troubleshooting of network devices and overlay networks. Experience connecting different environments via VPN. Experience in system and network administration. Knowledge of cloud security principles to protect data in the cloud from unauthorized access and threats. Experience working with software development teams as a system administrator or in a similar role. Experience with PostgreSQL, MySQL, or Apache Cassandra (e.g., replication setup) is desirable. Administrative experience with GitLab operations. Familiarity with MCP servers in AI-related environments is an advantage. Professional communication skills. Proficiency in both German and English. Our Tech Stack: Containerization & Cluster Orchestration : Docker, Kubernetes Databases : PostgreSQL, MySQL, Apache Cassandra Cloud Infrastructure on AWS : EKS, ECR, EC2, RDS, Route53, and more IaC Tools : Terraform, Ansible SCM : GitLab CI/CD Tools : GitLab CI, Jenkins Flexible work arrangements Mobile working options Family-friendly structures A job with purpose Attractive and performance-based compensation Work with agile methodologies and a modern tech and tool stack Subsidized public transport tickets & bike-leasing options 30 vacation days One extra vacation day & sabbatical options after 5 years Health and pension benefit plans, including EAP Employer-funded pension plan Our headquarter is centrally located in Hamburg- Sternschanze Would you like to be part of a dedicated team shaping the future of mobility and promoting the use of public transport in innovative ways? Then you're in the right place! Please send us your résumé via our application form, including your availability and salary expectations. Since we focus on your practical experience, a cover letter is optional. For certain positions, we also welcome work samples. Diversity makes us stronger! We welcome applications from people of all backgrounds, identities, and life situations, with or without disabilities. What counts is what you bring to the table – not where you come from.