Unlimit

Senior System Administrator/Infrastructure Engineer

Posted 2 Days Ago

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Belgrade, Grad Beograd, Centralna Srbija

In-Office

Senior level

Payments • Financial Services

The Role

Manage and maintain on‑premise Windows and Linux infrastructure, virtualization, backups, monitoring, patching and vulnerability remediation. Support cloud integrations and AWS migrations, DR/BCP testing, vendor coordination, and office hardware/expansion activities in a regulated fintech environment.

Summary Generated by Built In

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.

Top Skills

Windows Server,Active Directory,Gpo,Dns,Dhcp,Tcp/Ip,Vlan,Routing,Firewalls,Vmware,Hyper-V,Backup Solutions,Aws,Linux,Zabbix,Prometheus,Itil,Powershell,Bash

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The Company

HQ: London

436 Employees

Year Founded: 2009

What We Do

From London to Singapore and from San Francisco to São Paulo, we help businesses enter new markets, explore new industries, and reach new milestones. We are driven by a deep-seated determination to be the best possible partner for our customers – giving you the support you need to capitalize on a world that’s changing at breakneck speed.

Our mission is to provide innovators with a convenient and simple financial interface that enables payments to flow freely and invisibly across borders. We offer a wide range of services, including payment gateway, card acquiring, business accounts, card issuing, alternative payment methods, and more.

That’s the reason why we are called Unlimit: we provide unlimited growth opportunities for our customers, freeing them from the payment constraints.

Unlimit - Borderless Payments