Senior Site Reliability Engineer

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: From 32 000 PLN/month gross + quarterly KPI-based performance bonus. 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.