Senior Site Reliability Engineer - OneRail’s Technology Hub - Poland

OneRail seeks a Senior Site Reliability Engineer to help ensure the availability, performance, scalability, observability, and resilience of our SaaS platform. In this role, you’ll be responsible for designing and optimizing platform architecture, improving system reliability, driving automation initiatives, and enabling engineering teams to build and operate highly scalable services. This is a hands-on role for someone with deep expertise in cloud-native platforms, distributed systems, observability, and performance optimization. You’ll work closely with Engineering, Product, and Operations teams to improve platform reliability, scalability, and operational efficiency while reducing manual overhead through automation. Over time, you’ll have opportunities to influence platform architecture, lead reliability initiatives, and establish Site Reliability Engineering best practices across the organization. Responsibilities 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. Qualifications 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, both written and spoken (B2+). Work Location Hybrid, Kraków, Poland Office location: Kraków, Poland Work Style: Hybrid (2-3 days from the office/week) Salary levels: 28 000 – 32 000 PLN/month About OneRail OneRail is a leading omnichannel fulfillment solution pairing best-in-class software with logistics as a service to provide dependability and speed to help businesses meet their delivery promise. With a real-time connected network of 12 million drivers, OneRail matches the right vehicle for the right delivery so brands lower expenses and increase capacity to rapidly scale their businesses. This people-plus-platform approach features a 24/7 USA-based exceptions team who maintain a 98% on-time delivery rate. By optimizing fulfillment processes, reducing costs and improving order accuracy with store-shelf-to-doorstep visibility, OneRail is committed to empowering clients and improving the customer experience. OneRail was named to the Deloitte Technology Fast 500™ two years in a row, was ranked 19th in the 2025 FreightTech 25, named for the fifth year in a row to the FreightTech 100, was honored as one of Inc. magazine’s Best Workplaces 2023, was listed on Forbes’ lists of America’s Best Startup Employers for the last three years, was named to the Inc. 5000 two years in a row and was selected as the Last Mile Company of the Year for the 2024 SupplyTech Breakthrough Awards. To learn more about OneRail, visit OneRail.com.