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Application Engineer - Administrator at InventYOU AB. We are seeking a highly experienced . Senior Application Engineer / Administrator. to join our expanding team supporting complex enterprise infrastructure and application environments. This role is ideal for professionals with a strong foundation in application lifecycle management, automation, and containerized systems, who are eager to contribute in large-scale, multicultural IT environments.. You will be responsible for the deployment, configuration, performance tuning, and support of mission-critical applications, while also helping to drive DevOps best practices and continuous improvement in service quality. Your key responsibilities will be:. . Installing, configuring, and administering applications across production and non-production environments.. . Monitoring application performance, tuning systems, and driving operational efficiency.. . Supporting application-related incident, change, release, and problem management processes.. . Writing and maintaining documentation such as installation manuals, troubleshooting guides, and backup/restore plans.. . Automating system administration tasks and providing supporting documentation.. . Maintaining and enriching the technical knowledgebase for ICT Operations.. . Producing reports on availability, capacity, and performance of applications when required.. . Working knowledge of . English (B2 or higher).. . At least . 6 years. of experience in . Software Quality Assurance. , including GUI/API testing.. Strong experience in . C# or Java. , with OOP and design pattern usage.. Proven experience in test automation using tools like . RestAssured. , . RestSharp. , . Selenium WebDriver.. . Knowledge of . BDD methodologies. and tools (e.g., . SpecFlow. , . Cucumber. ). . Experience applying . DevOps best practices. , including continuous testing and release pipelines. . Experience with . system and acceptance testing. using dynamic/static techniques.. Technical Requirements. . At least . 6 years. of experience in mid/large IT infrastructure environments . . Minimum . 2 years. of experience with . microservices. , . container orchestration. , and . Docker/Kubernetes. . . Minimum . 2 years. administering and supporting . Elasticsearch. . . Minimum . 5 years. working with . enterprise Microsoft or Linux server. solutions . . Good knowledge of . Elasticsearch cluster administration. . . Good knowledge of container tools (. Kubernetes. , . Helm. , . Docker. , . Rancher. ) . . Strong scripting skills with . Shell. and/or . PowerShell. . . Familiarity with . configuration management. tools (e.g., . Ansible. , . Puppet. , . Chocolatey. ) . . Solid understanding of . ITIL. processes (incident, change, release) . . Desirable:. . Experience with . gRPC. , . non-functional testing. (performance, security, reliability) . . Experience with . Azure. or . AWS. (public/hybrid cloud environments) . . Experience with . relational databases. such as . MS SQL. or . PostgreSQL. . . Knowledge of . Kong API Gateway. . . Certifications related to the technologies above. . Company Location: Greece.