Senior Systems & Network Engineer — 24/7 Operations

ST ENGINEERING INFO-SECURITY PTE. LTD.; Singapore; On-site; SGD 110,000 - 190,000; Full time

Job summary

ST Engineering Info-Security Pte. Ltd. within the Infrastructure Sustainment Services Business Unit, Customer Success Division, seeks a Senior Systems and Network Engineer to maintain and enhance enterprise IT infrastructures for clients.

You will lead incident management, system hardening, patching and security controls, with 24x7 standby support as required, contributing to reliable, secure operations and strong client satisfaction. Location: Jurong East, Singapore.

Qualifications

• 6 to 8 years experience in IT infrastructure management and/or information security in enterprise or customer-centric environments.
• Deep expertise in IT infrastructure components, including hardware, software, OS, networking, and security principles.
• Proven track record in IT operations management: system administration, patch management, performance monitoring.
• Strong proficiency in Windows and RHEL operating systems, network technologies (firewalls, switches, load balancers) and related services.
• Excellent problem-solving, communication and stakeholder management skills.
• Vendor management capability and proactive adoption of emerging technologies.
• OT environments experience is advantageous.
• Ability to support round-the-clock standby duties.

Responsibilities

• Lead and manage root-cause analysis initiatives for complex incidents; serve as escalation point for infrastructure issues.
• Conduct preventive and corrective maintenance on IT infrastructure components to ensure availability.
• Execute incident and problem management per organisational standards to restore services within SLAs.
• Advise clients on performance, capacity planning and optimization of infrastructure.
• Implement and manage security controls including patch management and access control.
• Ensure changes and releases follow established protocols to maintain system integrity.
• Maintain documentation and generate operational and security reports for management and clients.
• Collaborate with client teams, internal departments and service providers for integrated IT/OT operations.
• Communicate risks, impacts and solutions to stakeholders, including non-technical audiences.
• Demonstrate autonomous work, prioritisation and ownership of tasks.
• Provide support for 24x7 standby duties.

Skills

IT infrastructure management

Information security

Windows OS

RHEL

Networking

Vendor management

OT exposure

Standby support

Job description

ST Engineering Info-Security Pte. Ltd. within the Infrastructure Sustainment Services Business Unit, Customer Success Division, seeks a Senior Systems and Network Engineer to maintain and enhance enterprise IT infrastructures for clients.

You will lead incident management, system hardening, patching and security controls, with 24x7 standby support as required, contributing to reliable, secure operations and strong client satisfaction. Location: Jurong East, Singapore.