Senior Systems & Network Engineer - 24x7 Resilience

St Engineering; Singapore; On-site; SGD 90,000 - 140,000; Full time

Job summary

Singapore Technologies Engineering Ltd. is seeking a Senior Systems and Network Engineer to maintain and enhance enterprise IT infrastructure, ensuring reliability, security and efficiency for clients.

The role focuses on proactive incident management, system hardening and performance optimization, with 24x7 standby duties and strong collaboration with client teams and service providers. The ideal candidate will have 6–8 years in IT infrastructure or information security, deep expertise in

Qualifications

• 6–8 years of IT infrastructure management and/or information security experience in enterprise or customer-centric environments.
• Deep expertise across hardware, software, operating systems, networking and security principles.
• Experience in IT operations management including system administration, patch management and performance monitoring.
• Strong proficiency with Windows and RHEL operating systems, network devices and related services.
• Excellent communication and stakeholder management abilities.
• Vendor management experience and proactive learning.
• Experience with OT environments is an advantage.
• Ability to support 24x7 standby duties.

Responsibilities

• Lead root-cause analysis initiatives and act as escalation point for infrastructure issues.
• Conduct preventive and corrective maintenance on servers, network devices and OS to ensure availability.
• Execute incident and problem management per SLAs to restore services quickly.
• Advise clients on performance optimization and capacity planning.
• Implement and manage security controls including patch management and hardening.
• Ensure change and release management protocols are followed to maintain integrity.
• Maintain documentation and generate operational/security reports for stakeholders.
• Coordinate with client teams and service providers for audits, changes and DR exercises.
• Communicate technical risks and impacts clearly to non-technical audiences.
• Demonstrate autonomous working and ownership of tasks and improvement initiatives.
• Support 24x7 standby duties as required.

Skills

Root-cause analysis

Incident management

Security controls

Communication

Vendor management

Standby duties

Tools

Windows

RHEL

Firewalls

Load balancers

Switches

Job description

Singapore Technologies Engineering Ltd. is seeking a Senior Systems and Network Engineer to maintain and enhance enterprise IT infrastructure, ensuring reliability, security and efficiency for clients.

The role focuses on proactive incident management, system hardening and performance optimization, with 24x7 standby duties and strong collaboration with client teams and service providers. The ideal candidate will have 6–8 years in IT infrastructure or information security, deep expertise in