Senior Site Reliability Engineer

OneRail Poland Sp. z o.o. is hiring for a Senior Site Reliability Engineer to work on ensuring the availability, performance, scalability, observability, and resilience of their SaaS platform. The role involves collaboration with Engineering, Product, and Operations teams to improve platform reliability and operational efficiency.

• Bachelor’s degree in Computer Science, Engineering, or a related technical field.
• 5+ years of experience in Site Reliability Engineering, Platform Engineering or a related role.
• Strong experience with cloud-native architectures and distributed systems.
• Hands-on experience implementing observability solutions, including metrics, logging, tracing, and application performance monitoring.
• Experience designing scalable backend architecture using Node.js, TypeScript, .NET.
• Strong knowledge of database administration, performance tuning, and optimization, including Azure Cosmos DB, MySQL, or similar platforms.
• Experience building automation frameworks, scripting solutions, and operational tooling.
• Familiarity with CI/CD pipelines and continuous integration practices using GitHub Actions or similar platforms.
• Experience with containerization technologies such as Docker.
• Strong understanding of event-driven architectures, messaging systems, and real-time data processing platforms.
• Experience with monitoring and observability tools such as Datadog, OpenTelemetry, ELK Stack, App Insights, Grafana, or Prometheus.
• Excellent troubleshooting, analytical, and problem-solving skills.
• Strong written and verbal communication skills with the ability to collaborate across technical and business teams.
• Advanced proficiency in English & Polish (B2+).

• Serve as the platform subject matter expert, mentoring engineering teams on reliability, scalability, security, and operational best practices.
• Design, implement, and maintain observability solutions covering logs, metrics, traces, APM, and alerting across all platform services.
• Benchmark, analyze, and optimize application performance, cloud services, integrations, databases, and distributed systems.
• Build and maintain performance, load, chaos, and resilience testing frameworks to proactively identify system weaknesses.
• Perform advanced analysis, tuning, and optimization of structured and unstructured databases to improve performance and scalability.
• Develop automation frameworks and operational tooling that eliminate manual processes and reduce human error.
• Lead incident response efforts, conduct root cause analysis, and drive continuous improvement through postmortem reviews and reliability initiatives.
• Optimize the performance of databases, caches, streaming platforms, message brokers, and backend services.
• Collaborate closely with Engineering, Product, and Operations teams to deliver highly available, production-grade platform solutions.
• Establish and maintain monitoring, alerting, and reliability standards across the platform.
• Create and maintain technical documentation, runbooks, architectural diagrams, and operational procedures.
• Evaluate emerging technologies and recommend solutions that improve platform reliability, scalability, observability, and operational efficiency.

Please be informed that the data controller is OneRail Poland Sp. z o.o. You have rights regarding your personal data including access, rectification, erasure, restriction, objection, portability, and complaint lodging to supervisory authorities. Data processing is for recruitment purposes with mandatory data provision as required by law. Consent for additional data is voluntary and may be withdrawn at any time. Data will be processed until the end of recruitment and possible future recruitment until consent withdrawal. The recipient of the data includes Just Join IT and entrusted entities involved in recruitment.