System Administrator Resume Summary Examples

Junior system administrator with 18 months supporting a 380-employee B2B SaaS company. Administer 64 Windows Server 2022 instances and 22 Ubuntu 22.04 hosts across Azure (East US + West Europe) using a mix of PowerShell automation (47 production scripts in version control), Ansible playbooks I inherited and extended, and Datadog for monitoring. Last quarter I owned the patch cycle for the Windows fleet end-to-end (SCCM + Intune), reducing average patch-to-production time from 9 days to 4 days. Comfortable with Active Directory / Entra ID, basic Terraform, and the on-call rotation. Looking for a mid-level systems administrator role on a team running hybrid cloud at SaaS scale.

Junior sysadmin at a 28-person MSP servicing 64 SMB clients across legal, dental, and small-manufacturing verticals (combined ~1,800 endpoints). Day-to-day owns the Windows Server 2019/2022 fleet, Microsoft 365 tenant administration across all 64 tenants, NinjaRMM-driven patching, and Tier-2 escalations from the help-desk team. Last 6 months reduced average ticket-resolution time from 4.2 hours to 1.8 hours through documenting our top 30 recurring tickets in IT Glue and standardizing the runbooks. Comfortable in PowerShell, Bash, basic Azure (Entra ID, Intune), and the multi-tenant context-switching MSP work requires. Targeting an in-house Junior or Mid-level Systems Administrator role to develop deeper expertise in a single environment.

Junior system administrator with 2 years supporting a 410-bed regional hospital network. Administer the Windows Server 2019 fleet (84 instances) underlying the Epic EHR, lab systems, and pharmacy integrations, with daily focus on the HIPAA-driven patch-window discipline (after-hours change control, documented rollback plans, pre/post-change validation). Reduced patch-related downtime incidents from 5/quarter to 0 over the last 12 months by formalizing the change-control checklist and pairing every change with a documented backup verification. Comfortable in PowerShell, Active Directory, SCCM, and the rhythm of healthcare-compliant administration. Looking for a mid-level systems administrator role within a healthcare or other regulated environment where change-control discipline is valued.

Junior systems administrator with 22 months at a 120-person DTC e-commerce company processing ~$48M annual GMV. Administer a hybrid Windows/Linux stack — 28 Windows Server 2022 instances (Active Directory, file shares, print services) plus 47 Ubuntu 22.04 hosts (Shopify integration services, Postgres replicas, internal apps) running on a Proxmox cluster we migrated from VMware vSphere in 2025 after the Broadcom licensing changes. Migration was led by my manager; I owned the 14-VM e-commerce-application tier (zero data loss, 3.2 hours total downtime over four scheduled windows). Comfortable in PowerShell, Bash, Ansible (62 playbooks I extended), and basic AWS (EC2, S3, IAM). Targeting a mid-level role at a similar-scale consumer or e-commerce company.

Senior system administrator with 8 years; last 5 at a 4,800-employee B2B SaaS company operating in healthcare and financial-services verticals. Own the production hybrid infrastructure: 420 Windows Server 2022/2025 instances (currently leading the Windows Server 2025 pilot covering 84 instances and the AD DS multivalue-attribute and randomized-computer-account-password modernization that comes with it), 680 RHEL 9 hosts, an Azure landing zone (East US 2 + West Europe + Southeast Asia) onto which we have migrated 62% of the production workload over 22 months, and the on-prem Proxmox cluster (180 VMs) that replaced our VMware environment in 2025. Cut unplanned downtime 60% over the last year through proactive monitoring (Datadog + custom Python anomaly detectors), automated remediation playbooks (Ansible, 340 playbooks across 12 service tiers), and a quarterly DR-exercise rhythm I established that has validated our 4-hour RTO and 15-minute RPO three quarters in a row. Looking for a Principal Systems Engineer or hybrid-cloud architect role at a similar-scale engineering org.

Senior sysadmin with 7 years at a 90-person MSP servicing 240 SMB and mid-market clients across financial services, legal, and healthcare verticals (combined ~14,000 endpoints, ~2,400 servers, 38 client Azure tenants). Built and lead our 4-person Azure migration practice — completed 47 client migrations covering ~1,100 servers, with a documented landing-zone reference architecture (Bicep + Terraform, 180 reusable modules) that has cut average client migration time from 14 weeks to 6 weeks and post-migration cost overruns from 22% to 4%. Authored our internal HIPAA-aware migration checklist (now used on every healthcare-vertical engagement) and lead the quarterly bring-your-own-laptop-day where we test each client's BCDR posture against a documented runbook. Comfortable in PowerShell DSC, Terraform, Bicep, Azure (deep), AWS (working), and the social work of a senior MSP IC who chairs the client architecture-review meetings. Looking for an in-house Principal Systems Engineer or Cloud Operations Lead role at a single mid-market or enterprise organization.

Senior systems administrator with 9 years; last 6 at a 6,400-employee regional health system operating 3 hospitals (combined 920 beds), 22 outpatient clinics, and a centralized lab. Own the Windows Server 2022 fleet (640 instances), the RHEL 8/9 fleet (180 hosts running the EHR-adjacent integration tier), Active Directory + Entra ID (24,000 user/computer objects across two forests in a long-running consolidation), and the HIPAA-compliance posture for the systems team. Led the on-prem-to-Azure-hybrid migration of 320 servers over 18 months while maintaining 99.97% Epic-uptime SLA and zero HIPAA findings on the post-migration audit. Established the security-baseline-as-code repository (PowerShell DSC + Ansible) governing 1,400 endpoint configurations, hardened patch-compliance from 67% to 98% across the fleet, and chair the quarterly DR-failover exercise covering Epic, the lab systems, and pharmacy integrations. Looking for a Principal Systems Engineer or Healthcare Infrastructure Architect role.

Senior system administrator with 8 years at a 920-person omnichannel retail and DTC company operating ~$1.2B annual GMV across 12 countries. Own the Linux-heavy production infrastructure: 840 Ubuntu 22.04 / RHEL 9 hosts (Magento Commerce + custom Node.js + Postgres + Redis + Kafka), 220 Windows Server 2022 instances (back-office, BI, RDS), the AWS footprint (multi-region across 4 regions handling ~720M monthly page views), and the on-prem Proxmox cluster (260 VMs, migrated from VMware in 2024). Led the AIOps adoption — replaced Nagios + Zabbix with a Prometheus + Grafana + Alertmanager + Datadog combination, plus Cilium Hubble for the Kubernetes data-plane observability. Alert noise dropped 78% in the first 6 months, MTTD dropped from 11 minutes to 75 seconds, MTTR from 47 minutes to 14 minutes. Comfortable in Bash, Python, Ansible, Terraform, Helm, and the production-Kubernetes operational discipline. Looking for a Principal Systems Engineer or SRE-lean systems role at a similar-scale consumer company.

Staff systems engineer with 13 years; last 6 architecting hybrid infrastructure at a 9,200-employee Fortune-500 B2B SaaS company. Authored the company-wide hybrid-cloud reference architecture (now governing 14 product surfaces across 1,400 production servers and a 4-region Azure landing zone), led the strategic kill of an in-flight pure-AWS consolidation that would have stranded our latency-sensitive EU customers, and chair the Infrastructure Architecture Review Board that approves any change crossing two services or affecting tenant data isolation. Set the Windows Server 2025 adoption strategy (3-phase rollout across 220 domain controllers covering AD DS modernization), the post-VMware standardization on Proxmox + Nutanix AHV for two distinct workload classes, and the AIOps platform consolidation (Datadog + Grafana + custom anomaly detection on top of Prometheus). Recognized for translating fuzzy executive infrastructure priorities into well-scoped engineering work and for promoting two of my team's senior engineers to Staff in the past 18 months. Looking for a Principal-track infrastructure architect role at a similarly large engineering organization.

Principal infrastructure architect with 14 years; spent years 1-9 in-house at two mid-market companies, last 5 years at a 180-person MSP servicing 480 mid-market and enterprise clients (combined ~38,000 endpoints, ~7,200 servers, 120+ client Azure / AWS tenants). Own the cross-client architecture function — set the MSP's reference architectures for hybrid AD, hybrid email (M365 + on-prem Exchange retirement), hybrid identity (Entra ID + AD DS), and the Azure landing zone IP. Authored the Bicep + Terraform module library (340 modules, 47 reference architectures) that every client engagement now starts from, cutting average new-client onboarding from 11 weeks to 4 weeks. Chair the monthly Architecture Review Board across our 14-person senior-engineer team. Recognized for translating fuzzy client-side compliance and growth priorities into vendor-neutral architectural recommendations and for the 4 senior engineers I have mentored from Senior to Principal over the past three years. Looking for an in-house Principal Infrastructure Architect or Director of Infrastructure role at a single mid-market or enterprise organization.

Staff systems engineer with 13 years; last 7 at a 14,000-employee integrated health system operating 7 hospitals (combined 2,100 beds), 64 outpatient locations, and a research institute. Authored the company-wide infrastructure reference architecture spanning Windows Server (currently mid-flight on the 2022 → 2025 transition across 380 domain controllers), RHEL 9 (640 hosts running the Epic-adjacent integration tier), Active Directory (two-forest consolidation in progress, ~62,000 user/computer objects), Azure (East US 2 + Central US dual-region landing zone, with a documented data-residency posture covering 8 US states' regulations), and the on-prem footprint (Proxmox-after-VMware for 240 lower-tier VMs, Nutanix AHV for the Epic-application tier). Led the 18-month HIPAA + HITECH + State-of-NY-SHIELD-Act compliance posture rewrite, cut unplanned Epic-downtime 64%, and chair the quarterly board-level DR readiness review. Recognized for translating regulatory ambiguity into engineering work and for mentoring four senior engineers from Senior to Principal/Staff over the past 4 years. Looking for a Principal Infrastructure Architect or VP of Infrastructure role at a comparably regulated health system.

Principal infrastructure engineer with 12 years; last 6 at a 1,400-person omnichannel commerce company operating $2.8B annual GMV across 18 countries and 6 brand families. Architected and now own the cross-brand infrastructure reference architecture — Linux-heavy production (1,200 RHEL 9 / Ubuntu 22.04 hosts), Windows Server 2022/2025 (340 instances on the back-office and BI side), a multi-cloud footprint (AWS primary across 5 regions, Azure for the Microsoft-shop subsidiary, GCP for the analytics platform), and the on-prem Proxmox + Nutanix split that replaced our VMware footprint in 2024-2025 ($1.4M annual licensing saved post-Broadcom). Set the AIOps and observability strategy (Prometheus + Grafana + Datadog + Cilium Hubble for eBPF-grade Kubernetes data-plane insight), authored the company-wide SLO framework adopted by 9 product teams, and chair the cross-brand Infrastructure Architecture Review Board. Recognized for translating executive cost-optimization mandates into well-scoped engineering work and for promoting three engineers from Senior to Staff in the past 24 months. Looking for a Distinguished Engineer or Chief Architect role at a similarly large commerce organization.

Systems infrastructure manager with 12 years; transitioned from senior IC to people-management 4 years ago. Currently lead an 11-person team (7 sysadmins, 2 cloud engineers, 2 SREs split between US-East and US-West coverage) at a 5,200-person B2B SaaS company. Own the operational budget ($4.8M annual), the hybrid-infrastructure roadmap (currently mid-flight on the Windows Server 2025 rollout, the Proxmox-post-VMware standardization, and the Azure landing-zone v2 redesign), and the 24x7 on-call rotation. Cut unplanned downtime 58% and ticket-volume 41% over the last 18 months through a combination of Ansible standardization (340 playbooks, 12 service tiers), AIOps platform consolidation (Datadog + Prometheus), and runbook discipline. Hired 6 of my 11 team members; promoted 3 from Mid to Senior in the past two years; chair the cross-functional Infrastructure & Reliability council across engineering, security, and IT. Looking for a Director of Infrastructure or Head of Systems Engineering role at a similar-scale SaaS company.

Manager of Systems & Cloud Operations with 13 years; last 4 leading a 14-person engineering team (8 sysadmins, 4 cloud engineers, 2 senior consulting engineers) at a 220-person MSP servicing 320 mid-market and enterprise clients across financial services, healthcare, and SaaS verticals. Own the operational P&L for the systems-operations practice ($6.2M revenue, 38% gross margin), the cross-client architecture reference library, and the senior-engineer career-progression framework I authored in 2024. Cut average client time-to-value (signed-contract to in-production stable state) from 14 weeks to 7 weeks through standardized Bicep + Terraform modules, the HIPAA + PCI + SOC 2-aware migration checklists, and the senior-engineer pairing rotation. Promoted 5 engineers from Mid to Senior over the past 24 months and hired 8 of my 14 team members. Comfortable in the IC depth that lets me code-review my team's PRs and the operational depth that lets me sit in client-CIO architecture reviews. Looking for a Director of Cloud Operations or VP of Engineering role at a single in-house mid-market or enterprise organization.

Director of Infrastructure with 14 years; last 5 leading the 18-person infrastructure team at a 9,800-employee integrated health system operating 4 hospitals (1,400 beds combined), 28 outpatient clinics, and a centralized telehealth platform. Own the infrastructure budget ($11.4M annual capex + opex), the HIPAA + HITECH + state-regulatory compliance posture for the systems function, the 24x7 on-call rotation across two coasts, and the Epic-uptime SLA (99.97% achieved 12 of the last 14 quarters). Led the 28-month on-prem-to-Azure-hybrid program (480 servers migrated, $2.4M annual infrastructure spend saved, zero HIPAA audit findings, three quarterly DR-failover exercises validated). Authored the infrastructure-team career framework (3 IC tracks, 1 management track) adopted across the 18-person team, hired 11 of my 18 team members, and promoted 6 engineers from Senior to Principal/Staff over the last 3 years. Looking for a VP of Infrastructure or CIO role at a comparably regulated health system.

Senior Engineering Manager, Infrastructure with 12 years; last 4 leading the 16-person platform / systems engineering team at a 1,200-person DTC + omnichannel commerce company operating $1.8B annual GMV across 14 countries. Own the operational budget ($7.6M annual), the cross-brand infrastructure roadmap (currently mid-flight on the multi-cloud consolidation, the post-VMware Proxmox + Nutanix split, and the AIOps consolidation onto Datadog + Prometheus + Cilium Hubble), and the 24x7 follow-the-sun on-call across US-East + EU coverage. Cut peak-season unplanned downtime 71% over the last two Black-Fridays through a combination of pre-season capacity-rehearsal cadence, runbook-driven incident-response discipline, and the SLO framework I introduced and now own across 6 product surfaces. Hired 9 of my 16 team members, promoted 4 from Senior to Staff in the past 24 months, and authored the Infrastructure Engineering career framework (5 IC levels, 3 management levels) adopted across the engineering org. Looking for a Director of Platform Engineering or VP of Infrastructure role at a comparably-sized commerce organization.