We are looking for an experienced Application Support Engineer to join a long-term technology team supporting business-critical applications in a high-availability environment.You will combine technical troubleshooting with a reliability-focused approach, working closely with engineering, platform, and infrastructure teams. The role also offers an opportunity to develop toward a senior reliability and operational engineering path.The position is based in Warsaw and follows a hybrid model with 3 days per week in the office, as well as participation in a 24/7 on-call rotation. Your tasks Investigating and resolving production incidents and application issues within agreed service levelsCollaborating with Development, Engineering, Infrastructure, SRE, and DevOps teams to ensure stable and reliable application performanceMonitoring application health, analyzing trends, and identifying opportunities to improve stability, performance, and maintainabilityImplementing and enhancing monitoring, alerting, and observability capabilities across applications and supporting servicesPerforming root-cause analysis and contributing to preventive actions for recurring issuesMaintaining technical documentation and knowledge base articles, and sharing knowledge within the support teamRequirementsAt least 5 years of experience in L2 Application Support or a similar technical production support role, with strong troubleshooting, problem-solving, incident management, and root-cause analysis skillsGood technical understanding of Java and Spring Boot applications, with knowledge of Kubernetes and containerized environmentsKnowledge of MongoDB and Kafka, including a good understanding of Kafka's role in distributed systemsPrevious experience with cloud environments; experience with Azure, AWS, or GCP is highly preferredExperience with monitoring, alerting, and observability, including hands-on experience with at least one platform such as Elastic, Splunk, Dynatrace, or New RelicProactive and reliability-focused mindset, with a strong focus on continuous improvement and the ability to collaborate closely with Development, Engineering, SRE, DevOps, and Infrastructure teamsFluency in both Polish and English, and willingness to work in a hybrid model from Warsaw, including participation in a 24/7 on-call rotationJob no. JOB-EPEJ8Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.Benefits For YouGreat Place to WorkSolid financial situationContracts with the biggest brandsCentre of internal trainingsMany experts you can learn fromOpen and accessible management teamProfit sharingPassion Sponsorship programRegular integration events and tripsComfortable and well-equipped officesMySii appMedical care

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L2 Application Support Engineer (f/m/x)