Available for work
Yurii Kozar System administrator & IT infrastructure — 15+ years keeping business systems up.
I look after the machines your company runs on: servers, networks, cloud, endpoints, and the security around them. Most of my work is invisible by design — no outages, no lost data, no ransomware Monday. When something does break, I am the person who already knew about it.
01
Services
Three ways companies hire me
Prices below are starting points for a typical small or mid-sized business. Scope drives the final number — I quote after the assessment, not before.
IT support
from $100
Day-to-day coverage so your team stops losing hours to broken tooling.
- Technical assistance for staff
- Device fleet management
- System monitoring & maintenance
- Backup & recovery
Cloud servers
from $200
Move off ageing hardware onto infrastructure that scales with demand.
- AWS, Azure and Google Cloud
- Migration from on-site hardware
- High-availability configuration
- Capacity sized to real usage
Cybersecurity
from $800
Close the gaps before someone else finds them.
- Firewall & threat protection
- Patch and update discipline
- Incident response planning
- Risk review & remediation
02
Selected work
Things I have built
Infrastructure work is mostly invisible. These are the pieces with an edge you can point at.
In development
Slack hardware inventory bot
The problem
Device requests and handovers arrive as ordinary Slack messages — no forms, no fixed wording. The asset register drifts out of date within weeks, and nobody can say with confidence who is holding which laptop.
What I built
A Slack bot that reads those unstructured messages and turns them into structured device records. A language model does the parsing, so staff keep writing the way they always did while the inventory stays current underneath.
- Slack API
- LLM parsing
- Claude
- LM Studio
- REST APIs
- Hardware asset register
In production
Zabbix monitoring for servers and network devices
The problem
Nobody learned that a server or switch had dropped off the network until someone tried to use it and complained. There was also no dependable record of what hardware and software was actually deployed — that lived in spreadsheets that went stale the week they were written.
What I built
Zabbix monitoring across the server and network estate, with reachability alerts pushed straight into a messenger so an unreachable device raises an alarm the moment it happens rather than at the next complaint. The same deployment collects hardware and software inventory, so the record of what is running stays current on its own.
- Zabbix
- SNMP
- Messenger alerting
- Network devices
- Server monitoring
- Hardware & software inventory
03
Track record
04
Process
How an engagement runs
Four stages, in order. You always know which one we are in.
Assessment & planning
I audit what you already have — servers, cloud accounts, devices, licences, backups — and write down where the real risk sits. You get a plan with priorities and costs before anything changes.
Implementation
I configure and deploy the agreed changes, scheduling the disruptive parts outside working hours. Nothing goes live without a rollback path.
Monitoring & maintenance
Systems report to me, not the other way round. Alerts, patch cycles, and backup verification run continuously so problems surface before your staff notice them.
Support & scaling
Technology changes and so does your headcount. I stay on to troubleshoot, adjust capacity, and grow the infrastructure alongside the business.
05
Capabilities
What I work with
Cloud
- AWS
- Microsoft Azure
- Google Cloud
- Cloud server deployment
- Hardware-to-cloud migration
- High availability
Endpoints & identity
- Jamf
- macOS fleet management
- Device provisioning
- SSO / OAuth
Service management
- Jira
- Confluence
- Service desk operations
- Documentation & runbooks
Automation & AI
- REST APIs
- Claude
- LM Studio
- Local LLM hosting
- Slack bots
- Workflow automation
Tooling
- GitHub
- Git
- VS Code
Monitoring & reliability
- Zabbix
- SNMP
- Alerting & escalation
- Network device monitoring
- Backup & recovery
- Disaster recovery planning
Security
- Firewall configuration
- Threat protection
- Patch management
- Incident response
- Risk mitigation
06
Experience
Career
System administrator
Brain Rocket
IT operations for a product company: managing the Apple device fleet through Jamf, running the service desk in Jira, and keeping infrastructure documentation and runbooks current in Confluence.
- Jamf
- Jira
- Confluence
Independent IT & security consultant
Freelance
Cybersecurity and infrastructure work for small and mid-sized businesses: firewall and threat protection, incident response, backup strategy, and cloud server builds across AWS, Azure and Google Cloud.
System administrator
In-house IT
Full ownership of company IT: server and network administration, monitoring and maintenance, backup and recovery, and technical support for staff.
07
References
“Working with Yurii was a game-changer for our online presence. Professional, responsive, and highly skilled — an invaluable IT partner.”
“Yurii provided exceptional IT solutions that transformed our infrastructure. He is proactive, highly skilled, and always ensures optimal system performance.”
08
Booking
Book a 30-minute call
Pick a slot below and the Google Meet link arrives with your confirmation — no email back and forth, no waiting on me to reply. We go through what you are running, what is going wrong, and whether I am the right person to fix it. If the job is not for me, I will say so on the call.
Opens my Google Calendar booking page.
Available for work
Tell me what keeps breaking.
Send a short description of your setup and the problem. I reply with an honest read on whether I am the right person for it — and if I am not, who is.