Senior Site Reliability Engineer (Kubernetes, B2B)

Location: Warsaw, Poland; hybrid schedule with 3 office days and 2 work-from-home days, plus WFA options.

Company

Webshare is an enterprise proxy platform providing self-service access to more than 80 million global IPs across 195 countries for web scraping, market research, and automated data collection.

What you will do

• Own and evolve Webshare's production infrastructure across hundreds of servers and approximately 50 services.
• Lead the migration from Docker Swarm to Kubernetes in on-premises and bare-metal environments.
• Maintain high availability and drive observability in cooperation with backend engineers.
• Establish Infrastructure as Code practices and improve CI/CD pipeline reliability.
• Participate in the on-call rotation, lead infrastructure incident resolution, run post-mortems, and implement systematic remediation.
• Develop platform tooling that improves developer experience and reduces infrastructure toil.

Requirements

• Experience building and operating highly available production infrastructure at scale, including hundreds of servers and dozens of services.
• Hands-on Kubernetes experience in self-hosted or bare-metal environments.
• Strong Infrastructure as Code, scripting, and development skills.
• Experience leading at least one major infrastructure migration from planning through stabilization.
• Familiarity with Python and/or Go, proxy and networking-heavy infrastructure, and edge or split compute/edge architectures.
• Previous experience in a small team where developers shared infrastructure responsibility.

Nice to have

• Backend experience with Python and edge-service experience with Go.
• Exposure to proxy infrastructure, edge clusters, or split compute/edge architectures.

Culture & Benefits

• Hybrid work with WFA options.
• Internal and external learning resources, guilds, communities, and knowledge sharing across the Tesonet network.
• Yearly workation, internal and community events, and a team-building budget.
• Latest tools, gadgets, and technology, plus extra days off and product deals.
• Private health insurance, gym access, physical well-being specialists, and psychologist or psychotherapist sessions.
• Inclusive family-related time-off policy.