Senior System Administrator

Join the Future of Cloud Technology at CloudSigma

CloudSigma is a fast-growing provider of cutting-edge cloud solutions (IaaS and PaaS) serving businesses worldwide. As an industry leader, we're expanding our talented team and looking for a Senior System Administrator to support and further develop our global infrastructure.

If you're experienced in Linux system administration, cloud technologies, infrastructure automation, and incident management and looking to take the next step in your career in a dynamic, international environment, we'd love to hear from you

Your Role & Responsibilities:

Maintain, administer, and improve Linux and Unix-based physical and virtual infrastructure across 20+ global locations

Monitor systems proactively, analyze logs, and manage incidents, ensuring optimal uptime, security, and performance

Deploy, troubleshoot, and maintain critical cloud and on-prem environments, including microservices-based virtualization platform, virtualization stacks, and monitoring solutions

Contribute to the automation of system deployments, configuration management, and service orchestration using tools such as Puppet and Foreman

Participate in infrastructure improvement projects, including secure architecture and network segmentation

Perform root cause analysis and post-incident reviews to prevent future issues

Support junior system administrators in resolving technical escalations, whether originating internally or from partners and customers by providing clear guidance and hands-on assistance in complex cases

Document operational procedures and contribute to knowledge-sharing within the team using clean, structured documentation

Required Skills & Experience:

5+ years of experience in Linux/Unix system administration in production environments

Solid experience with virtualization technologies (KVM preferred, VMware or similar also a plus)

Strong experience with monitoring tools and log management solutions (Zabbix, Grafana, ELK stack, etc.)

Excellent understanding of networking fundamentals (TCP/IP, VPN, firewalls, routing)

Deep understanding of infrastructure automation and configuration management with Puppet (Ansible and Foreman experience is a strong plus)

Hands-on experience with containerization platforms (Docker, Kubernetes, or similar)

Familiarity with incident and change management processes 

Experience with application and DB deployments in a production environment

Scripting skills (Bash, Python, or similar) to automate routine tasks

Fluent in English (both written and verbal)

Bonus Skills (a strong advantage):

Experience with the design, deployment, licensing, and support of VMware products, including Cloud Director, Cloud Director Availability, ESXi, and vCenter Server

Version control systems knowledge (GIT, Mercurial)

Experience with JIRA Service Management, Confluence

Experience with SQL DB queries and PostgreSQL commands

Security hardening knowledge (SELinux, AppArmor, SMACK, etc.)

Ideal Candidate Qualities:

Highly responsible and detail-oriented

Analytical thinker with a problem-solving mindset

A team player who thrives in a multilingual, collaborative environment

Comfortable with on-call rotations and critical incident handling

Proactive and eager to grow technically and professionally

What We Offer:

Competitive salary & attractive benefits package

Dynamic international working environment with real growth opportunities

Modern office in a prime location in the heart of the city

Business mobile and laptop to support your work

Hybrid work model – ability to work from home part of the time

Snacks, food vouchers, and in-office massages

Friendly, informal, and knowledge-sharing work atmosphere

A chance to build your career in one of the fastest-growing tech companies in the industry

What to Expect During the Hiring Process:

Shortlisted candidates will be given a hands-on technical assignment involving a real-world infrastructure setup using Puppet and Foreman. The task includes deploying and configuring a mail stack, virtualization host, monitoring system, and PostgreSQL nodes fully automated, securely configured, and well-documented. It's your chance to showcase your technical depth and automation mindset.

Ready to level up your career and help shape the future of cloud computing?

Apply now and grow with CloudSigma