Wikimedia Foundation - Senior Site Reliability Engineer, Wikimedia Enterprise

• Automation & Configuration Management: Experience with Infrastructure as Code and automation tools (e.g., Terraform, Ansible) and proficiency in at least one programming language (e.g., Python, Go, or similar) • Cloud Infrastructure: Experience designing, operating, and optimizing cloud-based systems across platforms such as AWS, Azure, or GCP, including scalability, reliability, and cost efficiency • CI/CD & Deployment Practices: Experience building and maintaining CI/CD pipelines and GitOps workflows (e.g., GitLab or similar, ArgoCD), with familiarity in progressive delivery approaches such as canary and blue-green deployments • Incident Management & Reliability Operations: Experience with incident response, on-call practices, and leading postmortems, with a focus on continuous improvement and operational excellence • SRE Principles & Observability: Strong understanding of SRE best practices, including SLOs, SLIs, and error budgets, along with experience in observability (metrics, logging, and distributed tracing e.g., Prometheus, OpenTelemetry) • Collaboration & Communication: Ability to work effectively in a distributed, cross-functional environment, with strong documentation and communication skills • Familiarity with Wikimedia or other open source projects is a plus. • If you are passionate about building and maintaining reliable, scalable, and highly available infrastructure on AWS, and thrive in a dynamic and collaborative environment, we encourage you to apply for this exciting opportunity to join our team at Wikimedia Enterprise • Qualities that are important to us: • Proven experience operating highly available, large-scale distributed systems, with a deep understanding of reliability, scalability, and failure modes • Ownership mindset: Takes end-to-end responsibility for system reliability, proactively identifying and addressing risks before they impact users • Bias for automation: Continuously seeks to reduce operational toil through automation and scalable solutions • Continuous improvement mindset: Actively learns from incidents and drives improvements through blameless postmortems and iterative enhancements • Customer and reliability focus: Prioritizes user experience by balancing availability, performance, and cost • Adaptability and learning: Comfortable working in a fast-evolving environment and learning new tools and technologies as needed • Experience managing and troubleshooting event streaming platforms at scale (e.g., Kafka, Kinesis, or similar) • Hands-on experience with cloud platforms such as AWS and/or GCP, including designing and operating production systems • Familiarity with data lake architectures and large-scale data processing frameworks (e.g., Iceberg, Flink, Spark) • Experience with continuous profiling and performance optimization tools to identify bottlenecks and improve system efficiency • Experience working with or contributing to open source projects, particularly in infrastructure or data ecosystems • Prior participation in the Wikimedia movement • The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. Our vision is a world in which every single human can freely share in the sum of all knowledge. We believe that everyone has the potential to contribute something to our shared knowledge, and that everyone should be able to access that knowledge freely. We host Wikipedia and the Wikimedia projects, build software experiences for reading, contributing, and sharing Wikimedia content, support the volunteer communities and partners who make Wikimedia possible, and advocate for policies that enable Wikimedia and free knowledge to thrive. • The Wikimedia Foundation is a charitable, not-for-profit organization that relies on donations. We receive donations from millions of individuals around the world, with an average donation of about $15. We also receive donations through institutional grants and gifts. The Wikimedia Foundation is a United States 501(c)(3) tax-exempt organization with offices in San Francisco, California, USA. • News from across the Wikimedia movement • Wikimedia Blog • Wikimedia 2030