> Markdown version of [/jobs/ext/1403566-senior-systems-administrator](https://www.wearedevelopers.com/jobs/ext/1403566-senior-systems-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Systems Administrator - **Company:** Quantum Electronic Payments - **Location:** Anaheim, CA, United States - **Experience:** Expert - **Salary:** $85,000.0 - $105,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Access, Microsoft Windows, Active Directory, Backup Devices, Business Systems, Software Documentation, CompTIA Security+, Cyber Security, Computer Networks, Dynamic Host Configuration Protocol, Desktop Computing, Disaster Recovery, Domain Name System (DNS), Multi-Factor Authentication, Monitoring of Systems, Networking Hardware, Virtual Private Networks (VPN), Networking Basics, PCI Data Security Standards, Windows PowerShell, Phishing, Security Information and Event Management, Software Engineering, User Provisioning Software, Wireless Access Point, Wireless Networks, EndPointSecurity, Reliability of Systems, Firewalls (Computer Science), Information Technology, Patch Management, Laptops, User Administration, Vulnerability Analysis, User Accounts - **Published:** July 23, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=9993e7aac36fad11 ## About the Role * 5+ years of experience in systems administration, IT administration, infrastructure support, or a similar role * Strong experience with Microsoft 365, Active Directory, Windows environments, user access management, and endpoint support * Comfortable supporting both hardware and software issues in an onsite office environment * Working knowledge of networking concepts including DNS, DHCP, VPN, firewalls, switches, and wireless networks * Experience with endpoint management, patch management, device security, backups, and system monitoring * Solid understanding of security best practices including MFA, least privilege access, phishing awareness, endpoint protection, and user access reviews * Ability to troubleshoot technical issues independently and communicate updates clearly * Strong documentation habits and attention to detail * Comfortable working in a smaller company environment where priorities may shift and ownership is important * Professional, dependable, responsive, and service-minded * Able to communicate clearly with both technical and non-technical employees Nice to Have * Experience in fintech, payment processing, banking, financial services, or another compliance-focused environment * Familiarity with PCI DSS, SOC, or similar security/compliance frameworks * Experience with EDR/MDR tools, vulnerability scanning, SIEM tools, or security monitoring platforms * Experience supporting both Windows and Mac devices * PowerShell scripting or basic automation experience * Experience improving onboarding/offboarding processes, access control, documentation, or IT asset management * Certifications such as CompTIA Security+, Network+, Microsoft certifications, or similar * Prior experience leading a small IT support function or serving as the primary IT point of contact for a business ## Description Unlock your potential with Quantum ePay® We're a growing fintech company focused on delivering innovative payment processing solutions and merchant technology that helps businesses lower costs, earn more, and operate with confidence. We power mission-critical payment processing platforms used by merchants and partners across the U.S. We are looking for a dependable, hands-on Senior Systems Administrator to support and help manage our internal IT environment, systems, infrastructure, and security operations. This role will work directly with our Chief Engineering Officer and serve as the senior onsite IT resource for employees, systems administration, technical escalations, and internal technology improvements. This role is a great fit for someone who takes initiative, stays organized, communicates clearly, and enjoys keeping systems secure, reliable, and running smoothly. The Senior Systems Administrator will help ensure our employees have the access, equipment, systems, and support they need, while also helping strengthen our IT processes, documentation, and overall system reliability. Responsibilities * Manage and maintain company IT systems, user accounts, access permissions, hardware, software, and internal technology tools * Administer Microsoft 365, Active Directory, email, MFA, shared drives, security groups, and other business systems * Support onboarding and offboarding from an IT perspective, including account setup, access provisioning, equipment preparation, and access removal * Serve as an escalation point for the Desktop Support Technician and assist with more complex technical issues * Support laptops, desktops, printers, phones, conference room equipment, VPN access, and other onsite technology needs * Monitor system performance, troubleshoot issues, and help resolve outages or service interruptions * Maintain endpoint security, patching, device compliance, antivirus/EDR tools, and system updates * Support network equipment and basic network troubleshooting, including firewalls, switches, wireless access points, DNS, DHCP, and VPN * Maintain backups, disaster recovery procedures, and business continuity documentation * Track IT assets, licenses, equipment inventory, and system documentation * Create and maintain IT procedures, troubleshooting guides, onboarding/offboarding checklists, and internal support documentation * Coordinate with vendors and service providers as needed * Partner with the Chief Engineering Officer on IT priorities, security improvements, system upgrades, and internal technology projects * Identify opportunities to improve IT processes, reduce recurring issues, and strengthen system reliability and security ## Related Videos - [Passkeys: Truly Phishing-Resistant? Implementation and Pitfalls](https://www.wearedevelopers.com/videos/100156-passkeys-truly-phishing-resistant-implementation-and-pitfalls) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [Agentic employees in world's most downloaded FinTech app](https://www.wearedevelopers.com/videos/100123-agentic-employees-in-world-s-most-downloaded-fintech-app) - [Full-stack role-based authorization in 45 minutes](https://www.wearedevelopers.com/videos/312-full-stack-role-based-authorization-in-45-minutes) - [The Developer Workstation Blind Spot: Why Your Security Stack Can't See What Matters Most](https://www.wearedevelopers.com/videos/100254-the-developer-workstation-blind-spot-why-your-security-stack-can-t-see-what-matters-most) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) ## Related Articles - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [7 Cloud Computing Trends Coming in 2025 for Developers](https://www.wearedevelopers.com/magazine/412-7-cloud-computing-trends-coming-in-2025-for-developers) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [System change: restart as developer?](https://www.wearedevelopers.com/magazine/39-system-change-restart-as-developer)