AMSTERDAM · BUILDING SINCE 2003
Twenty-three years,
one layer at a time.
I'm Gojko Vujovic, Director of DevOps for AI Security at Zscaler. My career has gone from ISP racks in Belgrade, through firewalls and threat hunting, to running zero trust at cloud scale, and now building AI infrastructure, AI agents and AI-powered troubleshooting.
- 23
- years in networks, security & infrastructure
- 9+
- years at Zscaler, engineer to director
- 5
- layers, one thread: keep the packets safe
Scroll to open the stack ↓
LAYER 1 · 2003 — 2007
Wiring the early internet
- Cisco course instructorrootPlanet · 2003–2004
- NOC Network EngineerVeratNet · 2004–2006
- Network / Systems EngineerBeotelNet · 2006–2007
- Taught Cisco exam-prep courses and wrote new lab content.
- Ran ISP networks: routers, BRAS, wireless and pre-WiMAX backhaul, SDH, BGP and OSPF.
- Wrote AAA / RADIUS portals in PHP, MySQL and Perl for ADSL and wireless subscribers.
- Led a major VoIP project on Cisco CallManager, connected to Avaya, Asterisk and Netcentrex.
LAYER 2 · 2007 — 2013
Inside the firewall
- Senior Technical Support Engineer, Advanced TACJuniper Networks · 2007–2013
- L3 escalation for datacenter security deployments: design reviews, lab testing, solution validation.
- Dedicated POC and pre-sales support for high-end security devices.
- Hired, trained and mentored technical staff; wrote and reviewed technical documentation.
- Specialist in SRX firewalls, MX-series carrier-grade NAT, IDP / IPS and IPsec.
LAYER 3 · 2013 — 2017
Hunting threats
- Solutions ArchitectFireEye · Amsterdam · 2013–2017
- Technical escalation point for the pre-sales Systems Engineering team.
- Strategic customer engagements, solution development and proofs of concept.
- Built sales-enablement projects from idea to working code: lab automation, demo scenarios, competitive bypass demos.
LAYER 4 · 2017 — 2024
Zero trust at cloud scale
- Senior Site Reliability Engineering ManagerZscaler · 2022–2024
- Site Reliability Engineering ManagerZscaler · 2020–2022
- Sr. Site Reliability EngineerZscaler · 2017–2020
- Emerging Technologies SRE for Zscaler Private Access, Shift and Cloud Browser Isolation.
- Designed the monitoring and metrics system from scratch.
- AWS, Docker and Kubernetes infrastructure, automated with Terraform and Ansible; CI/CD on Jenkins.
- Internal tools for cloud visibility, software version tracking and Kafka monitoring. Postgres, Elasticsearch, Cassandra.
LAYER 5 · 2024 — NOW
Platforms, then AI
- Director, DevOps — AI SecurityZscaler · Nov 2025 – now
- Building the AI infrastructure behind AI Guard, a new product that secures generative AI.
- Building AI agents.
- Building AI-enhanced visibility and troubleshooting tools.
- Director, Platform EngineeringZscaler · 2024–2025
- Kubernetes as a service: a company-wide platform for engineering teams.
- Kafka and OpenSearch as a service: managed clusters instead of every team running its own.
THE FOUNDATION
What's under the stack
Networks
Cisco, Juniper, BGP, OSPF, ISP operations, wireless backhaul, VoIP
Security
Firewalls, NAT, IDP / IPS, IPsec, advanced threat protection, zero trust
Reliability
AWS, Kubernetes, Terraform, Ansible, monitoring, incident response, cost
Platform
Kubernetes, Kafka and OpenSearch as a service; Postgres, Cassandra, CI/CD
AI
AI infrastructure, AI agents, AI Guard, AI-enhanced visibility and troubleshooting
LAYER 6 · NEXT