We are looking for a
highly skilled Senior System Administrator
to lead mission-critical IT infrastructure operations and ensure enterprise-grade reliability, performance, and security. This role requires not only deep technical expertise across Linux, Windows, networking, and security, but also strong coordination skills with external teams, vendors, and partners.
The ideal candidate must be able to respond quickly to critical incidents, perform advanced troubleshooting (including complex network analysis), and continuously improve system operations with automation, monitoring, and proactive measures. Strong communication in English (both written and spoken) is essential for coordinating with international teams.
Key Responsibilities
- Lead administration and optimization of Linux (Ubuntu/CentOS/Debian) and Windows Server environments.
- Coordinate with external teams, vendors, and global IT partners for issue resolution and project execution.
- Implement and maintain enterprise security practices: firewalls, VPNs, IDS/IPS, endpoint protection, patching, and vulnerability management.
- Conduct in-depth troubleshooting of infrastructure and networking issues using tools like
traceroute, MTR, netcat (nc), netstat
, tcpdump, and Wireshark. - Ensure rapid incident response, root-cause analysis, and effective problem resolution under pressure.
- Develop, optimize, and review automation scripts (Bash, PowerShell, Python) and API integrations (REST/JSON).
- Architect and manage monitoring and observability platforms including
Zabbix, Prometheus, Grafana, LibreNMS, and Observium
. - Support and enforce compliance with global security frameworks (ISO 27001, SOC 2, GDPR readiness).
- Perform capacity planning, high-availability design, and disaster recovery strategies.
- Mentor, guide, and review work of junior/mid-level system administrators.
- Document technical procedures, operational playbooks, and change management records.
Requirements
- 7–10 years of professional experience in system administration or IT infrastructure roles.
- Advanced expertise in Linux and Windows Server management.
- Strong knowledge of Active Directory, DNS, DHCP, Group Policy, and LDAP.
- Excellent troubleshooting skills for both
system and network layers
(TCP/IP, routing, VLANs, BGP/OSPF basics). - Hands-on scripting and automation (Bash, PowerShell, Python).
- Experience with API consumption and integration (RESTful, JSON).
- Proficiency in analyzing and resolving networking issues with traceroute, MTR, nc, netstat, tcpdump, Wireshark, and related tools.
- Strong cybersecurity knowledge (system hardening, patching, SIEM integration).
- Fluent in Bahasa Indonesia and strong proficiency in English (written and verbal)
for external coordination. - Fast response mindset, able to work under pressure with deep analytical and continuous learning approach.