Senior Infrastructure, Security Specialist (Contract)

Argyll Scott Singapore; Singapore; Hybrid; SGD 120,000 - 180,000; Full time

Job summary

Argyll Scott Singapore is seeking aSenior Infrastructure & Security Specialist to join its technology team. The role blends hands-on infrastructure operations with network and cloud security, incident management and vendor coordination in a hybrid on-premise and cloud environment.

You will own security of the infrastructure, manage security controls, respond to incidents and support cybersecurity initiatives while working with external service providers and internal stakeholders to maintain

Qualifications

• Degree in Information Technology, Engineering or related discipline or equivalent experience.
• Minimum 5 years of IT infrastructure experience across systems, networks, security administration and cloud support.
• At least 3 years in infrastructure security or security engineering/operations.
• Hands-on experience in hybrid on-premise and cloud environments.
• Experience with enterprise networking and security technologies (switches, WLAN, NGFWs, ATP, ZTNA).
• Familiarity with SIEM, vulnerability management and cloud security technologies.

Responsibilities

• Manage day-to-day network, cloud and workplace infrastructure operations for availability, performance and security.
• Design and secure network infrastructure including firewalls, VPNs and segmentation.
• Administer Zero Trust and secure remote-access solutions for users and sites.
• Secure cloud environments with IAM, encryption, logging and monitoring.
• Monitor alerts, investigate root causes and support timely resolutions.
• Support cybersecurity initiatives including vulnerability management, pentesting, audits and DLP.
• Develop incident-response procedures and participate in security exercises.
• Coordinate internal and external tech and security providers, document SLAs and escalations.

Skills

Hybrid infrastructure

Network security

Cloud security

Incident management

Vendor coordination

Security architecture

Education

Bachelor's degree in IT or Engineering

Tools

Next-gen firewalls

SIEM

Vulnerability scanners

Zero Trust implementations

Job description

Company / Role Overview

An established multinational organisation is seeking a Senior Infrastructure & Security Specialist to join its technology team. The position sits within a lean internal technology function supported by external consultants and service providers. The role combines hands‑on infrastructure operations with network and cloud security, cybersecurity initiatives, incident management and vendor coordination. The successful candidate will be expected to take ownership of a hybrid on‑premise and cloud environment while ensuring infrastructure remains secure, resilient and operationally effective.

Key Responsibilities

• Manage and support day-to-day network, cloud and workplace infrastructure operations, maintaining system availability, performance and security.
• Design, maintain and secure network infrastructure, including enterprise firewalls, VPN connectivity, intrusion detection/prevention controls, network segmentation and wireless/network access infrastructure.
• Administer Zero Trust and secure remote‑access solutions supporting users, branch locations, internet and SaaS connectivity, data‑centre access and private applications.
• Secure cloud environments through appropriate identity and access controls, encryption, logging, monitoring and infrastructure hardening practices.
• Monitor infrastructure, network, cloud and security alerts; investigate incidents, perform root‑cause analysis and support timely resolution of operational and security issues.
• Support cybersecurity initiatives including vulnerability management, penetration testing, infrastructure security assessments, compliance reviews, data‑loss prevention and incident‑response readiness.
• Develop and maintain incident‑response procedures, participate in security exercises and contribute to broader infrastructure, cybersecurity and emerging‑technology security planning.
• Coordinate internal technology, security and external service providers, tracking service levels, managing escalations and maintaining appropriate technical and operational documentation.

Job Requirements

• Degree in Information Technology, Engineering or a related discipline, or equivalent professional experience.
• Minimum 5 years of experience in IT infrastructure, covering areas such as systems, networks, security administration and/or cloud support.
• At least 3 years of hands‑on experience in infrastructure security or security engineering/operations.
• Strong experience supporting hybrid environments spanning on‑premise infrastructure and public cloud platforms.
• Hands‑on knowledge across enterprise networking and security technologies, including switches, wireless access points, next‑generation firewalls, advanced threat protection and Zero Trust network access.
• Practical experience with SIEM, vulnerability‑management/scanning tools and cloud security technologies, together with exposure to identity management, encryption, logging and monitoring controls.
• Previous involvement in at least one incident‑response exercise, infrastructure/security audit or penetration‑testing engagement, with an understanding of vulnerability remediation and security compliance.
• Able to work independently, manage multiple priorities and take ownership of issues, with strong analytical, problem‑solving, stakeholder‑management and communication skills. Flexibility to occasionally support activities outside standard working hours may be required due to operational, vendor or time‑zone requirements.