Senior System Administrator/Infrastructure Engineer

Unlimit

Belgrade permanent

Posted: February 17, 2026

Quick Summary

Senior System Administrator/Infrastructure Engineer is responsible for ensuring high-quality infrastructure support for the company's global operations. The ideal candidate will have experience in systems administration, infrastructure management, and technical support. Strong technical skills in cloud computing, networking, and security are a must.

Required Skills

Job Description

About Unlimit

Unlimit is the global fintech powerhouse behind the world’s largest proprietary payments infrastructure.
Founded in 2009, Unlimit operates across 17 global offices with 700+ experts, seamlessly integrating 1,000+ payment methods into a single platform. From London to São Paulo, we empower businesses to scale across borders with a unified suite of financial tools — including payment processing, alternative payment methods, multicurrency business accounts, card issuing, banking-as-a-service, and crypto on- and off-ramps.
Our mission is to break down financial barriers and enable seamless money movement across borders. We give forward-thinking businesses the tools to accept, send, and manage payments effortlessly, wherever they operate.

About the Role
We are looking for a hands-on System Administrator to manage and support our on-premise IT infrastructure. This role is responsible for maintaining high availability, security, and operational stability of local systems. The ideal candidate is structured, proactive, security-aware, and comfortable working in a regulated environment (fintech).

Responsibilities:
• Administration of Windows and Linux servers (AD, DNS, DHCP, File Services)
• Management of virtualization platforms (VMware / Hyper-V)
• Support and maintenance of the on-premise equipment
• Backup administration and restore testing
• Monitoring system health and availability
• Patch management and vulnerability remediation
• Managing local integrations with cloud services and migration to AWS
• Maintaining technical documentation and runbooks
• Participating in BCP/DR testing (including DR site switchovers)
• Vendor coordination for on-site hardware and connectivity
• Supporting office expansions or relocations

Required Qualifications:
• 3–5+ years experience as System Administrator / IT Infrastructure Engineer
• Strong knowledge of:
• Windows Server (AD, GPO, DNS, DHCP)
• TCP/IP networking fundamentals
• VLANs, routing, firewall basics
• Virtualization (VMware or Hyper-V)
• Experience with backup solutions
• Understanding of IT security best practices
• Experience in regulated environment is a plus
• Good written and spoken English

Nice to Have:
• AWS experience
• Linux administration
• Experience with monitoring systems (Zabbix / Prometheus / etc.)
• ITIL understanding
• Scripting skills (PowerShell / Bash)
• Experience in fintech or banking sector

Join Unlimit Team now!

Unlimit is an equal opportunity employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We welcome applications from all members of society irrespective of age, sex, disability, sexual orientation, race, religion or belief.

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