Senior Site Reliability Engineer

OneRail Poland Sp. z o.o. is hiring a Senior Site Reliability Engineer to ensure the availability, performance, scalability, observability, and resilience of their SaaS platform. The company values deep expertise in cloud-native platforms, distributed systems, observability, and performance optimization, working closely 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, and .NET.
• Strong knowledge of database administration, performance tuning, and optimization, including Azure Cosmos DB and MySQL.
• 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 ability to collaborate across technical and business teams.
• Advanced proficiency in English and 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.