Looking for a job

Mark Fester

@markfester

Message

AI Infrastructure Engineer at Cirrascale, managing a 1,000+ node GPU fleet and building LLM-powered NOC tools.

South Africa

Message

At Cirrascale Cloud Services, I manage a 1,000+ node GPU fleet and built FWSCOUT, an LLM-powered firmware lookup tool now deployed as production NOC tooling. I also build internal React and LLM API tools for NOC operations.

Through Digital Cowboys, I founded and operate HALO, a cloud contact centre combining VoIP, WhatsApp API, and live chat. I also build AI-augmented data pipelines and OSINT tooling, including structured datasets spanning more than 55 million records.

Experience

Work history, roles, and key accomplishments

Current

Senior Infrastructure Engineer (NOC/GPU)

Current

Cirrascale Cloud Services

Jul 2024 - Present (2 years 4 months)

Manages a 1,000+ node GPU fleet including NVIDIA H100, RTX 4090, and AMD MI300X. Performs bare-metal diagnostics, BIOS/firmware lifecycle management, and OS-level troubleshooting for HPC/AI workloads.

NVIDIA H100 RTX 4090 AMD MI300X Hardware Diagnostics IDRAC ILO BMC AWS Direct Connect Microsoft Azure (ExpressRoute)React LLM APIs

Current

Founder

Current

Digital Cowboys

Jan 2021 - Present (5 years 10 months)

Founded and operates a Cape Town tech brand spanning cloud contact centre (HALO), web design, and data services. Runs HALO with FreeSWITCH, Telnyx, and WhatsApp API stack.

Freeswitch Telnyx WhatsApp API Cloud Contact Center Data Pipelines OSINT

Senior Linux & VoIP Engineer

Wanatel Africa / Mindspring Computing / Grand Communication

Apr 2021 - Jun 2022 (1 year 2 months)

Provided enterprise Linux and Asterisk administration, disaster recovery, VMware clustering, and Azure cloud support across multiple organisations.

Linux Asterisk VMWare Azure Disaster Recovery

Senior Linux Administrator & Technical Lead

Clarotech

Aug 2006 - Apr 2021 (14 years 8 months)

Led infrastructure design and support across LAN/WAN, VPN, DNS, DHCP, and call centre platforms. Managed Linux/Asterisk environments, FreeBSD servers, VMware/Hyper-V virtualisation, and advanced bandwidth shaping.

Linux Asterisk FreeBSD VMWare Hyper V VPN DNS DHCP Traffic Shaping

Unix Administrator

Nedbank

Jan 2004 - Jan 2006 (2 years)

Performed Unix system administration in a regulated financial services environment, including system monitoring, hardware support, and enterprise support.

Unix System Monitoring Enterprise Support