Senior Site Reliability Engineer

We’re a team of 500+ professionals who develop cutting-edge proxy and web data scraping solutions for thousands of the world’s best known businesses, including Fortune 500 companies. What’s in store for you: You’ll be solving complex challenges and maintaining our own infrastructure with 60PB+ monthly data traffic. Here are its scale and maturity in numbers: - 6PB+ Ceph storage - 60PB+ monthly data traffic through our systems - 300k+ service requests/sec processed - 500k+ Kafka messages/sec streamed In this role, you’ll: Own and evolve Webshare's production infrastructure - lead the migration from Docker Swarm to Kubernetes (or hybrid K8s + Ansible). Maintain high availability across hundreds of servers and ~50 services. Drive observability in cooperation with development team. Establish and enforce IaC practices, CI/CD pipeline reliability, and change management processes. Participate in the on-call rotation alongside backend developers. Respond to and lead incident resolution, run post-mortems and drive systematic remediation. Contribute platform tooling that improves developer experience and reduces infrastructure toil. Keep backend engineers informed and capable — no silos, shared infrastructure ownership. Your skills & experience: Have built and operated highly available infrastructure at comparable scale — hundreds of servers, dozens of services, real production load. Hands-on K8s in self-hosted / bare-metal environments. Confident with Infrastructure as Code. Have owned CI/CD pipelines end-to-end (GitLab CI or equivalent). Have been on call in a production environment. Proactive— surfaces problems before being asked, keeps the team informed without prompting. Scripting and development skills. Nice to have: Led at least one major infrastructure migration - planned, executed, and stabilised it. Python and/or Go familiarity - backend is Python, edge services are Go. Exposure to proxy, networking-heavy infrastructure. Previous experience in a small team where developers shared infrastructure responsibility. Familiarity with edge clusters or split compute/edge architectures. Salary & Benefits: Gross salary: 26 000 PLN/month - 34 000 PLN/gross. Keep in mind that we are open to discussing a different salary based on your skills and experience. Growth & Learning: 40+ internal learning options, external conferences, mentorship, and year-round knowledge-sharing. Health & Well-being: Private health insurance, gym allowance and a wellness app. Celebration & Community: Team events, an overseas workation and plenty of ways to mark milestones together.