Senior Site Reliability Engineer – Global API & Data Infrastructure

About the role

We are looking for a Senior Site Reliability Engineer to own the reliability, scalability and performance of the large‑scale API and data infrastructure that powers worldwide reuse of Wikimedia content. You will work in a fully distributed, globally collaborative environment alongside experienced SREs, software engineers and platform teams.

Key responsibilities

• Define, track and improve SLOs, SLIs and error budgets for critical services.
• Design and enhance observability systems, including metrics, logging and distributed tracing.
• Participate in incident response, on‑call rotations and post‑incident reviews.
• Build and maintain CI/CD and GitOps pipelines for secure, automated deployments.
• Implement infrastructure‑as‑code using Terraform, Ansible and other automation‑first practices.
• Design, operate and optimise scalable cloud infrastructure across production environments.
• Drive capacity planning, performance optimisation and resilience testing, including chaos engineering.
• Improve developer experience through self‑service infrastructure and streamlined workflows.
• Collaborate with security, software and release engineering teams to embed reliability and security best practices.
• Apply FinOps principles to optimise cost without compromising availability.
• Mentor peers and promote best practices in SRE, automation and systems reliability.

Required profile

• 5+ years of experience in SRE, DevOps or infrastructure engineering.
• Strong experience with infrastructure‑as‑code tools such as Terraform and/or Ansible.
• Proficiency in at least one programming language (Python, Go or similar).
• Hands‑on experience with large‑scale distributed systems and cloud environments.
• Demonstrated ability to design observability, incident response and reliability strategies.
• Collaborative mindset with a focus on automation and continuous improvement.

Required skills

• Terraform
• Ansible
• Python
• Go
• CI/CD pipelines
• GitOps
• Cloud infrastructure (AWS/GCP/Azure)
• Observability (metrics, logging, tracing)
• Incident response and on‑call duties
• Chaos engineering
• FinOps cost optimisation