Senior Infrastructure & Security Engineer (On-Call 24x7)

ST ENGINEERING INFO-SECURITY PTE. LTD.; Singapore; On-site; SGD 90,000 - 120,000; Full time

Job summary

ST Engineering Info-Security Pte. Ltd. is seeking a seasoned Systems and Network Engineer to maintain, secure and optimize enterprise IT infrastructure for diverse clients.

The role focuses on resilience, incident resolution and continuous improvement of security protocols. You will manage complex network environments, implement security controls, and drive proactive maintenance while ensuring service availability.

Qualifications

• 6–8 years of IT infrastructure and/or information security experience in enterprise environments.
• Deep knowledge of hardware, software, OS, networking and security principles.
• Proven ability to manage patches, performance monitoring and incident handling.
• Experience with Windows and RHEL, firewalls, switches, and load balancers.
• Strong communication and stakeholder management, with vendor liaison experience.

Responsibilities

• Lead root-cause analysis and escalate complex infrastructure incidents.
• Perform preventive and corrective maintenance on servers, network devices, and OSs.
• Manage incident and problem processes to restore services within SLAs.
• Advise clients on performance, capacity planning and optimization.
• Implement patching, vulnerability remediation, access controls and system hardening.
• Follow Change and Release Management processes for patches and updates.
• Document configurations, SOPs, recovery procedures and incident records; prepare reports.
• Coordinate with client teams, internal units and external providers for audits, changes and DR exercises.
• Communicate risks, impacts and recommendations clearly to stakeholders.
• Demonstrate autonomous work habits, prioritisation and accountability for tasks.
• Provide 24x7 standby support as required.

Skills

IT infrastructure management

Information security

Windows

RHEL

Networking

Vendor management

Tools

Firewall/config

Patch management tools

Monitoring tools

Job description

ST Engineering Info-Security Pte. Ltd. is seeking a seasoned Systems and Network Engineer to maintain, secure and optimize enterprise IT infrastructure for diverse clients.

The role focuses on resilience, incident resolution and continuous improvement of security protocols. You will manage complex network environments, implement security controls, and drive proactive maintenance while ensuring service availability.