Systems Administrator
Confirmed on the employer's own hiring board on Oct 11, 2026. First seen by Alion on Oct 9, 2026. MedRisk scores B on the Alion truth index.
Guatemala-based candidates with valid work authorization only.
Position Summary
We are looking for a Systems Administrator to join our Infrastructure team and support highly available, business-critical environments.
This role has a strong focus on F5 BIG-IP application delivery and Imperva Web Application Firewall (WAF), along with hands-on administration and support of Microsoft Windows Server and VMware vSphere environments.
The ideal candidate is a strong troubleshooter who can understand the complete application-delivery path, identify where issues are occurring, and collaborate effectively with Infrastructure, Network, Security, Database, and Application teams.
Key Responsibilities
- Administer and troubleshoot F5 BIG-IP/LTM, including virtual servers, pools, health monitors, profiles, persistence, iRules, SSL/TLS, and certificates.
- Administer and support Imperva WAF, including application onboarding, security policies, troubleshooting blocked requests and false positives, and policy tuning.
- Troubleshoot application traffic across DNS, WAF, firewalls, load balancers, web/application servers, and backend services.
- Administer and troubleshoot Microsoft Windows Server, including Active Directory-integrated environments, IIS, DNS, certificates, services, and permissions.
- Windows Server Administration, support VMware vSphere, vCenter, ESXi, HA, DRS, vMotion, virtual machines, and clusters.
- Support production incidents, root-cause analysis, vulnerability remediation, patching, upgrades, and infrastructure changes.
- Participate in disaster recovery, failover testing, infrastructure monitoring, and capacity management.
- Create and maintain technical documentation, diagrams, runbooks, and recovery procedures.
- Collaborate with Security, Network, Application, and Database teams to resolve complex infrastructure and application-delivery issues.
- Participate in an on-call rotation as required.
Required Qualifications
- 3-5+ years of Systems Administration or Infrastructure Engineering experience. F5 and Imperva responsibilities make application delivery, web security, certificates, DNS/network troubleshooting, and escalation skills important parts of the role.
- Hands-on experience administering and troubleshooting F5 BIG-IP/LTM.
- Experience with Imperva WAF or comparable enterprise Web Application Firewall technologies.
- Strong Microsoft Windows Server administration experience.
- Experience administering VMware vSphere environments.
- Strong understanding of TCP/IP, DNS, HTTP/HTTPS, SSL/TLS, certificates, and load balancing, network protocols and connectivity
- Experience troubleshooting multi-tier enterprise applications. Disaster Recovery and Business continuity.
- Strong troubleshooting, documentation, communication, and ownership skills.
- Experience HIPAA, HITRUST, SOC 2, ISO 27001, or similar regulatory and security requirements is a plus.
Preferred Qualifications
- Experience with F5 iRules and Imperva Cloud WAF.
- Experience with Microsoft IIS and PowerShell.
- Experience with VMware HA, DRS, vMotion, and infrastructure lifecycle management.
- Experience with monitoring, vulnerability management, backup, and disaster-recovery technologies.
- Experience supporting highly available or regulated environments.
- F5, VMware, Microsoft, or security-related certifications are a plus.
Core Competencies
Technical Troubleshooting: Able to systematically isolate problems across network, security, application-delivery, virtualization, operating-system, and application layers.
Application Delivery: Understands how enterprise applications traverse DNS, WAF, firewalls, load balancers, web servers, and backend services.
Security Awareness: Understands the security implications of infrastructure changes and balances application availability with appropriate security controls.
Ownership: Takes responsibility for technical issues through resolution rather than simply transferring problems between teams.
Change Discipline: Plans, documents, tests, and validates production changes and maintains appropriate rollback procedures.
Communication: Clearly communicates technical issues, risks, outages, and recommendations to technical and non-technical stakeholders.
Continuous Improvement: Identifies opportunities to automate repetitive activities, eliminate recurring incidents, improve documentation, and increase infrastructure reliability.
You should be able to follow an application request end-to-end:
Client → Firewall → Imperva WAF → F5 → Web/Application Server → Backend Services
If you enjoy solving complex infrastructure problems, working across technologies, and supporting critical enterprise environments, we’d like to hear from you.