IT Security Officer

NTT SINGAPORE PTE. LTD.; Singapore; Hybrid; SGD 90.000 - 130.000; Vollzeit

Zusammenfassung

NTT SINGAPORE PTE. LTD. is seeking an IT Security Officer to support a hybrid on‑premises and AWS environment, driving vulnerability management and risk governance.

You will coordinate remediation with stakeholders and monitor security operations to protect critical assets. The role requires 3–5+ years in IT security, hands-on experience with scanning tools, and strong ability to prioritize risks using CVSS in a complex enterprise setting.

Qualifikationen

• Bachelor's degree in Information Security, Computer Science, or a related field.
• 3–5+ years of experience in IT security operations, vulnerability management, or risk management.
• Hands-on experience with vulnerability scanning tools (Tenable/Nessus, Qualys, Rapid7).
• Working knowledge of AWS security services and shared responsibility model (Security Hub, GuardDuty, Inspector, IAM).
• Solid understanding of on-premises infrastructure security (servers, network devices, endpoints).
• Strong understanding of CVSS scoring methodology and practical risk-based prioritization.
• Experience developing and managing Risk Registers and Risk Acceptance documentation.
• Excellent stakeholder management and cross-functional communication.

Aufgaben

• Execute and manage regular vulnerability scans across on-premises infrastructure and AWS services.
• Generate, review, and distribute vulnerability scan reports to relevant technical teams and leadership.
• Follow up with SMEs on outstanding vulnerability findings to ensure timely remediation or documented exceptions.
• Track remediation status and elevate overdue items per defined SLAs.
• Own and maintain the organization's Risk Register, ensuring it reflects current risk data.
• Draft Risk Acceptance forms for identified risks that cannot be immediately remediated.
• Coordinate with stakeholders to review and obtain approval on risk acceptances.
• Periodically review accepted risks for continued validity and reassessment.
• Monitor and verify that security signature updates are applied consistently across the environment.
• Review vendor security bulletins and vulnerability notifications for applicability.
• Ensure timely triage and action on vendor-disclosed vulnerabilities affecting in-scope systems.
• Perform impact analysis on CVSS scores and contextualize against environment to prioritize risk.
• Provide risk-based recommendations to stakeholders to support remediation prioritization decisions.
• Prepare periodic status reports/dashboards on vulnerability management and risk status.
• Communicate effectively with SMEs, business stakeholders, and management at varying levels of technical understanding.

Kenntnisse

Vulnerability management

Risk management

Security operations

CVSS scoring

Stakeholder communication

Ausbildung

Bachelor's degree in Information Security, Computer Science, or related field

Tools

Tenable/Nessus

Qualys

Rapid7

AWS Security Hub

GuardDuty

Inspector

IAM

Jobbeschreibung

The IT Security Officer will support the customer's information security program across a hybrid infrastructure consisting of on-premises systems and AWS cloud services. This role is responsible for driving the vulnerability management lifecycle, maintaining the organizational Risk Register, coordinating risk acceptance and remediation activities with stakeholders, and overseeing day-to-day security operations related to signature updates and vendor vulnerability notifications.

Key Responsibilities

Vulnerability Management

• Execute and manage regular vulnerability scans across on-premises infrastructure and AWS services (EC2,S3, RDS, and other relevant services)
• Generate, review, and distribute vulnerability scan reports to relevant technical teams and leadership
• Follow up with Subject Matter Experts (SMEs) on outstanding vulnerability findings to ensure timely remediation or documented exceptions
• Track remediation status and elevate overdue items per defined SLAs

Risk Register & Risk Acceptance

• Own and maintain the organization's Risk Register, ensuring it reflects current, accurate risk data
• Draft Risk Acceptance forms for identified risks that cannot be immediately remediated
• Coordinate with business and technical stakeholders to review, negotiate, and obtain formal approval/sign-off on risk acceptances
• Periodically review accepted risks for continued validity and reassessment

Security Operations Oversight

• Monitor and verify that security signature updates (AV/EDR, IDS/IPS, etc.) are applied consistently across the environment
• Review vendor security bulletins and vulnerability notifications to determine applicability to the customer's environment
• Ensure timely triage and action on vendor-disclosed vulnerabilities affecting in-scope systems

Impact& Risk Analysis

• Perform impact analysis on identified vulnerabilities using CVSS (Common Vulnerability Scoring System) scores
• Contextualize CVSS base scores against the actual environment (asset criticality, exposure, compensating controls) to determine real-world risk and prioritization
• Provide risk-based recommendations to stakeholders to support remediation prioritization decisions

Reporting& Communication

• Prepare periodic status reports/dashboards on vulnerability management, risk register status, and outstanding risk acceptances for leadership review
• Communicate effectively with technical SMEs, business stakeholders, and management across varying levels of technical understanding

Required Qualifications

• Bachelor's degree in Information Security, Computer Science, or related field (or equivalent work experience)
• 3–5+ years of experience in IT security operations, vulnerability management, or risk management
• Hands-on experience with vulnerability scanning tools (e.g., Tenable/Nessus, Qualys, Rapid7)
• Working knowledge of AWS security services and shared responsibility model (e.g., Security Hub, GuardDuty, Inspector, IAM)
• Solid understanding of on-premises infrastructure security (servers, network devices, endpoints)
• Strong understanding of CVSS scoring methodology and practical risk-based prioritization
• Experience developing and managing Risk Registers and Risk Acceptance documentation
• Excellent stakeholder management and communication skills, with ability to work cross-functionally

Preferred Qualifications

• Relevant certifications: Security+, CySA+, CISSP, CRISC, AWS Security Specialty, or similar
• Experience with GRC tools (e.g., ServiceNow GRC, Archer)
• Familiarity with frameworks such as NIST 800-53, NIST CSF, or ISO 27001
• Experience working in a hybrid on-prem/cloud environment supporting external customers

Soft Skills

• Strong analytical and problem-solving skills
• Detail-oriented with strong documentation habits
• Ability to influence and drive accountability without direct authority
• Comfortable working with ambiguity and competing priorities