System Engineer / Site Reliability Engineer | 1

Join our team as a key contributor responsible for the end-to-end operation of approximately 700 systems across TEST, AC1, PreLIVE, and LIVE environments. You will work in a highly automated, performance-driven infrastructure, ensuring stability, scalability, and continuous improvement of our VoIP and Radius platforms.

As part of our team, you will

• Operate, maintain, and enhance VoIP and Radius systems within high-performance data centers

• Develop and improve automated system management using Puppet and Debian-based server clusters

• Drive projects within the VoIP and Radius environment across their full lifecycle — from design and implementation to deployment

• Perform performance analysis and optimization to ensure system efficiency and reliability

• Plan and execute rollouts of new features and system updates

• Carry out regular maintenance activities (system expansions, updates, upgrades)

• Analyze, troubleshoot, and resolve technical issues in a structured and goal-oriented manner

• Coordinate with upstream providers by creating and managing trouble tickets

• Participate in an on-call rotation (additional compensation provided)

You are an experienced IT professional with strong Linux expertise and a passion for open-source technologies. Ideally, you bring:

• A degree in Computer Science, Natural Sciences, or a comparable qualification

• Several years of experience in IT operations (FOSS systems or Site Reliability Engineering)

• Strong expertise in Linux administration, especially with clustered environments

• Practical experience with ITIL processes (Incident, Problem, and Change Management)

• Solid understanding of networking (TCP/IP, UDP)

• Scripting skills (Bash, Python, Perl) for automation

• Strong analytical and troubleshooting skills

• Experience with virtualization (e.g. KVM, Proxmox, oVirt, OpenStack) – nice to have

• Knowledge of VoIP technologies and telephony systems (e.g. Asterisk, Kamailio) – a plus

• Experience with FreeRADIUS – a plus

• Knowledge of MySQL / MariaDB administration

• A proactive, service-oriented mindset and ability to quickly understand complex systems

• Good English skills (written and spoken); basic German is an advantage

We hereby inform you that the company Polska sp. z o.o. has implemented an internal reporting (whistleblowing) procedure. The content of the procedure and the possibility to submit an internal report are available at:

[link for members]

The company Polska is part of the global the company Group and plays a key role in driving the digital transformation of businesses and public institutions. Operating in cities such as Warsaw, Poznan, Katowice, Lublin, Rzeszow, Lodz the company offers a wide range of IT services. The company Polska actively supports employee development by fully funding training, certifications, and participation in technology conferences. Additionally, the company is involved in local social initiatives, such as charitable projects and promoting an active lifestyle. It prides itself on fostering a diverse and inclusive work environment, ensuring equal opportunities for all.

Globally, the company operates in 19 countries and employs over 28,000 professionals. The company focuses on four key areas:

• Consulting (the company Consulting): Strategic advisory services that help organizations define and implement innovative solutions.

• Infrastructure and Application Management (the company Technologies): Designing and managing IT systems tailored to clients’ individual needs.

• Software Implementation (the company Solutions): Deploying partner solutions from industry leaders like Microsoft, SAP, Salesforce, and ServiceNow.

• Custom Software Development (the company Software): Creating unique software solutions to meet specific client needs.

With strategic partnerships with major technology giants, including Microsoft, SAP, Salesforce, and ServiceNow, the company delivers advanced technological solutions tailored to customer requirements. In 2023, the company reported revenues of €2.5 billion, underscoring its strong position in the digital services market.

The company distinguishes itself by offering a comprehensive range of benefits that meet the diverse needs of employees, providing flexibility, support and commitment. Here's what makes working at the company unique:

Attractive financial benefits

• A cafeteria system that allows employees to personalize benefits by choosing from a variety of options.

• Generous referral bonuses, offering up to PLN6,000 for referring specialists.

• Additional revenue sharing opportunities for initiating partnerships with new clients.

Professional development and team support

• Ongoing guidance from a dedicated Team Manager for each employee.

• Tailored technical mentoring from an assigned technical leader, depending on individual expertise and project needs.

Community and Well-Being

• Dedicated team-building budget for online and on-site team events.

• Opportunities to participate in charitable initiatives and local sports programs.

• A supportive and inclusive work culture with an emphasis on diversity and mutual respect.