Infrastructure Administrator

Top Prospect Group; Westfield (MA); Hybrid; USD 90,000 - 95,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

Top Prospect Group is seeking a hands-on Infrastructure & Security Administrator to own DigiCert administration and SSL/TLS certificate lifecycle across the IT environment.

You will manage Windows Server, Active Directory, and security operations, coordinate vulnerability management, and support incident response with a focus on risk reduction.

Qualifications

• Hands-on IT infrastructure and security operations experience.
• Experience with certificate management and PKI lifecycle.
• Experience with digital certificates, PKI, SSL/TLS.
• Familiarity with Windows Server and Active Directory.
• Knowledge of network security, DNS, and firewall troubleshooting.

Responsibilities

• Maintain Windows Server, Active Directory, endpoints, patches, backups, and operations.
• Monitor XDR/MDR alerts and support incident investigations and remediation.
• Own DigiCert administration and SSL/TLS certificate lifecycle management.
• Support firewall policies, DNS, access control, and network security.
• Maintain system and security documentation and monitor certificate expirations.
• Communicate technical issues and remediation steps clearly to stakeholders.

Skills

Security Operations

PKI & Certificate Management

DigiCert

SSL/TLS

Windows Server

Active Directory

DNS

Firewalls

Networking Troubleshooting

Documentation

Communication

XDR/MDR

Tools

NinjaOne/RMM

Fortinet

Job description

Own the security, protect the infrastructure, and take the lead on PKI in a hands-on role where your expertise makes a real impact every day.

FT

Hybrid

90-95K

SecOps,, XDR/MDR, Incident Response, Vulnerability Management, DigiCert, PKI, SSL/TLS, Windows Server, Active Directory, IT Infrastructure, Firewalls

We're seeking a hands-on Infrastructure & Security Administrator to support and secure a business's IT environment. This role combines systems administration, infrastructure maintenance, and day-to-day security operations, with primary ownership of DigiCert and the SSL/TLS certificate lifecycle.

Key Responsibilities

• Infrastructure Administration: Maintain Windows Server, Active Directory, endpoints, patching, backups, and general systems operations.
• Security Operations: Monitor XDR/MDR alerts, assist with incident investigations, coordinate remediation, and support vulnerability management and security hardening.
• PKI & Certificate Management: Own DigiCert administration, manage SSL/TLS certificates and renewals, maintain certificate inventories, and troubleshoot certificate-related issues.
• Network Security: Support firewall policies, DNS, access controls, and network security in collaboration with IT teams.
• Monitoring & Documentation: Maintain system and security documentation, track certificate expirations, and identify opportunities to improve reliability and reduce risk.
• Client Support: Communicate technical issues, remediation steps, and recommendations clearly to internal stakeholders and clients as needed.

Required Qualifications

• Hands-on experience in IT infrastructure, systems administration, or a similar technical role.
• Working knowledge of security monitoring, incident response, vulnerability management, and remediation.
• Experience managing digital certificates, PKI, SSL/TLS, or a similar certificate management platform.
• Familiarity with Windows Server, Active Directory, DNS, firewalls, and network troubleshooting.
• Strong troubleshooting, documentation, and communication skills.

Preferred Qualifications

• Experience with DigiCert or another certificate authority platform.
• Familiarity with XDR/MDR tools, Fortinet firewalls, NinjaOne/RMM, and backup solutions.
• Experience working in an MSP or client-facing IT environment.
• CompTIA Security+, CySA+, Fortinet, or related certifications.