Senior Site Reliability Engineer

OpenX operates a 100% cloud-based (GCP) platform handling over 380 billion ad requests daily, with significant scale in CPU, RAM, data, and production deployments.

• At least 5 years of GCP experience
• Bachelor's degree in Computer Science, related technical field involving systems engineering, or equivalent practical experience
• Experience with Kubernetes, Docker, and containers
• Experience with CI/CD
• Experience in one of the following programming languages: Java, Python, Go, or other
• Experience with current AI tools, especially Claude Code and Codex
• Good English skills

Nice to have:

• Expertise in designing, analyzing, and troubleshooting large-scale distributed systems
• Good understanding of public cloud services and tasks such as VPC, load balancing, relational and non-relational datastores (e.g., Google Cloud SQL, Memorystore, AWS RDS), storage (e.g., GCS, AWS S3), monitoring (e.g., GCP Stackdriver, AWS CloudWatch, Prometheus), serverless computing (e.g., GCF, AWS Lambda), and auto-scaling
• Ability to debug and optimize code and automate routine tasks
• Experience with security

• Design, write, and deliver software to implement and support large web-scale, highly-performant, highly-available infrastructure on GCP/AWS (e.g., Terraform)
• Monitor infrastructure, respond to incidents, correct and improve systems to prevent incidents, and plan capacity
• Support system deployments and product releases
• Tune large-scale clusters for optimal performance and efficiency
• Work closely with engineering, project management, and operational peers to develop innovative technical tools and solutions
• Participate in on-call rotation

Candidates are expected to commute to the Krakow office once a week for team collaboration.