Systems Administrator (PBX & IT)

About the role

Our client, a fast‑growing fintech company in Cape Town, is looking for a Systems Administrator with strong PBX and telephony expertise. You will ensure the reliability of voice services while supporting the broader IT infrastructure that powers the business.

Key responsibilities

• Administer, maintain and troubleshoot PBX platforms (3CX, Asterisk, FreePBX, Yeastar, Grandstream).
• Configure SIP trunks, inbound/outbound routes, IVRs, call queues, extensions and call flows.
• Monitor PBX performance, generate call reports and resolve voice‑quality issues.
• Deploy and configure new telephony solutions and support related incidents.
• Install, configure and maintain workstations, software and basic office network equipment (switches, firewalls, Wi‑Fi APs).
• Assist with Active Directory user and group management and Microsoft 365 administration.
• Maintain firewall rules (FortiGate preferred) and ensure compliance with IT security best practices.
• Document procedures and provide technical support to internal users.

Required profile

• 2–3 years of experience in system or PBX administration.
• Hands‑on experience with at least one major PBX platform.
• Solid understanding of VoIP, SIP protocols and basic networking concepts.
• Familiarity with Microsoft 365 and Active Directory environments.
• Strong troubleshooting and problem‑solving abilities.

Required skills

• 3CX, Asterisk, FreePBX, Yeastar, Grandstream
• SIP trunk configuration, IVR, call queue management
• VoIP technologies and SIP protocol
• TCP/IP, DNS, DHCP, VLANs, VPNs
• FortiGate firewall (advantage)
• Microsoft 365 administration
• Active Directory
• Windows workstation setup and support