This is the section where round two of the screen actually happens, the closing gate before an
interview hits your inbox. A recruiter takes their time here, and even at that, the current
role still drives around 95% of the result.
That tracks: nothing proves what you can run in production today like the seat you sit in
right now. To earn a "yes", the section has to hit every entry on the
SysAdmin role profile, one bullet per domain you named in Domain
Expertise above. Every bullet has to come off something you genuinely held in production,
never a ticket that landed on your queue.
1
Linux & Windows Server Administration
You run the servers everything else depends on. Hiring managers read a fleet you actually keep healthy
behind it, not "I restart servers when they break", so this is where a sysadmin proves out.
Talk about how you used CIS hardening and service tuning, across RHEL and Windows Server, to hold your
uptime SLA on the hosts you managed.
Techniques
Build standards
OS hardening (CIS)
Lifecycle management
Service tuning
Tools
RHEL, Ubuntu, Debian
Windows Server 2019 / 2022
systemd, services.msc
Metrics
Hosts under management
Uptime SLA held
Tickets resolved
2
Identity, Access & Directory Services
You control who gets into what. Loose access is how one stolen login turns into a breach or a failed
audit, so hiring managers want to see it locked down. Show them how you used Group Policy and
joiner-mover-leaver flows, in Active Directory with Okta, to meet the access SLA and clean out stale
accounts.
Techniques
Group Policy / GPO
LDAP / sssd
SSO & MFA
Joiner-mover-leaver
Tools
Active Directory
Okta / Entra ID
FreeIPA
Metrics
Identities managed
Access SLA met
Stale accounts cleaned
3
Patching, Hardening & Vulnerability Management
You patch and harden the fleet before attackers find the gap. Patching hundreds of hosts without
breaking things is genuinely hard, so hiring managers want proof you do it on a cadence, not in a panic
after a CVE drops. Point out how you used patch automation and CIS baselines, with Ansible and Tenable,
to cut patch lead time and close critical CVEs.
Techniques
Patch automation
CIS & STIG baselines
Maintenance windows
Vuln triage
Tools
WSUS, Satellite, Spacewalk
Ansible playbooks
Tenable, Qualys
Metrics
Patch lead time
Critical CVE closure
Baseline drift down
4
Monitoring, Alerting & Incident Response
You catch a server in trouble before users do. Hiring managers look here to see whether problems show up
on your dashboard first, or whether the helpdesk finds out for you. Mention how you used trend alerts
and runbook automation, in Zabbix and Prometheus, to cut MTTR and quiet the alert noise.
Techniques
Threshold & trend alerts
Runbook automation
Postmortems
On-call rotation
Tools
Nagios, Zabbix
Prometheus / Grafana
PagerDuty, Opsgenie
Metrics
MTTR cut
Alert noise reduced
Major incidents resolved
5
Backup, Recovery & Storage
You get everything back after a disaster. An untested backup is the classic way this goes wrong, and
restore success is a number a hiring manager can check. Walk them through how you used RPO and RTO
design with regular restore testing, in Veeam and Restic, to keep restores reliable and protect storage
headroom.
Techniques
RPO / RTO design
Restore testing
Snapshot lifecycle
Capacity planning
Tools
Veeam, Commvault
Bacula, Restic
NFS, iSCSI, SMB
Metrics
Restore success rate
RPO / RTO held
Storage headroom
6
Automation & Scripting
You automate the tasks you'd otherwise do by hand fifty times. Every hour of toil you remove is an
hour the team gets back, so a hiring manager reads automation as someone who scales past themselves. Lay
out how you used idempotent playbooks and drift detection, in Ansible and PowerShell, to bring hosts
under code and cut toil hours.
Techniques
Idempotent playbooks
Cron & scheduled tasks
Self-service automation
Drift detection
Tools
Ansible, Puppet, Chef
PowerShell, DSC
Bash, Python
Metrics
Hosts under code
Toil hours cut
Drift incidents down
7
Networking & Connectivity Operations
You operate the shared services: DNS, DHCP, VPN, firewall. Two things ride on it for a hiring manager:
shared services that stay up, and changes that land without breaking connectivity. Spell out how you
used DNS and DHCP operations with VPN provisioning, on Infoblox and WireGuard, to hold service
availability and cut the DNS error rate.
Techniques
DNS / DHCP operations
VPN provisioning
Firewall rule changes
Load-balancer pools
Tools
BIND, Infoblox, Windows DNS
F5, HAProxy, Nginx
OpenVPN, WireGuard
Metrics
Service availability
Change requests fulfilled
DNS error rate
8
Tooling & Workflow
You scale with a growing fleet instead of firefighting it. Companies keep the sysadmins who scale with
the fleet, not the ones stuck doing everything by hand, so hiring managers look for it. Tell them how
you used ticket triage and runbook libraries, in ServiceNow and Confluence, to handle more per shift and
cut mean time to acknowledge.
Techniques
Ticket triage
Change advisory boards
Runbook libraries
On-call shadowing
Tools
ServiceNow, Jira Service Mgmt
Confluence, Notion
Git, GitLab
Metrics
Tickets per shift
Mean time to acknowledge
On-call ramp cut