Consultant, Security Testing and Red Teaming

Ensign Services; Singapore; On-site; SGD 90,000 - 120,000; Full time

Job summary

Ensign Services is seeking an experienced penetration tester to lead end-to-end engagements from Singapore. You will perform manual vulnerability discovery, validate findings, and assess business impact across web apps, networks, AD, cloud, mobile, IoT, and OT.

The role requires OSCP, ideally CRT, and 3–5 years hands-on testing experience in consulting or security. You will produce actionable reports and engage with clients throughout engagements.

Qualifications

• OSCP is required.
• CRT is preferred.
• Advanced certifications such as OSWE, OSEP, OSED, MCRTA, CRTO, eMAPT are a plus.
• Approximately 3 to 5 years of hands-on penetration testing experience in consulting or security.
• Strong understanding of testing methodologies, rules of engagement and ethical hacking.
• Foundations in TCP/IP, Windows and Linux, and web app security.

Responsibilities

• Deliver end-to-end penetration testing engagements with minimal supervision.
• Perform manual vulnerability discovery, validation, and exploitation beyond automated scanning.
• Identify attack paths, chain vulnerabilities, and assess real-world business impact.
• Produce high-quality findings with accurate severity and remediation guidance.
• Develop structured testing reports and support client walk-throughs and debriefs.
• Engage with clients during kick-off sessions and results discussions.
• Contribute to playbooks, knowledge sharing, and red team initiatives.

Skills

Penetration testing

Scripting/automation

Report writing

Communication of findings

Red teaming interest

Tools

Burp Suite

Nmap

Metasploit

BloodHound

Job description

Ensign is hiring !

Roles and Responsibilities

• Deliver end-to-end penetration testing engagements with minimal supervision, including:
  • Web application penetration testing
  • Internal and external network penetration testing
  • Active Directory security assessments
  • Cloud and hybrid environment testing
  • Mobile application penetration testing
  • IOT penetration testing
  • OT penetration testing
• Perform manual vulnerability discovery, validation, and exploitation beyond automated scanning.
• Identify attack paths, chain vulnerabilities, and assess real-world business impact.
• Exercise sound judgement in exploitation depth, data handling, and risk management during testing.
• Maintain clear, detailed testing notes, evidence, and attack logs to support reporting and quality review.
• Produce high-quality technical findings with accurate severity assessment and actionable remediation guidance.
• Develop structured penetration testing reports, and support client walkthroughs and debriefs.
• Engage professionally with clients during kick-off sessions, testing clarification, and results discussions.
• Participate in peer reviews of testing approaches and reports to uphold delivery quality standards.
• Continuously develop technical depth across offensive security techniques, platforms, and tooling.
• Contribute to security testing playbooks, internal knowledge sharing and peer learning.
• Where appropriate, contribute to broader offensive security initiatives, such as:
  • Adversary simulation and red teaming exercises
  • Custom tooling, scripting, or automation
  • Internal research, labs, or capability development

Requirements

• Offensive Security Certified Professional (OSCP) is required.
• CREST Certified Registered Penetration Tester (CRT) is preferred.
• Advanced or specialist certifications such as:
  • OSWE, OSEP, OSED
  • MCRTA, CRTO
  • eMAPT
• Approximately 3 to 5 years of hands‑on penetration testing experience in consulting, internal security, or equivalent practical environments.
• Strong understanding of penetration testing methodologies, rules of engagement, and ethical hacking principles.
• Solid technical foundations in:
  • TCP/IP networking and common protocols
  • Windows and Linux operating systems
  • Web application architecture and common vulnerability classes
• Demonstrated experience testing:
  • Web applications, including authentication, authorization, and business logic flaws
  • Network and infrastructure environments
  • Active Directory domains
  • Mobile applications
• Proficiency with common penetration testing tools (e.g. Burp Suite, Nmap, Metasploit, BloodHound).
• Experience with scripting or programming (e.g. Python, PowerShell, Bash) to support testing and automation.
• Exposure to cloud security testing (AWS, Azure, GCP) and modern identity platforms.
• Experience with post‑exploitation, lateral movement, and attack path analysis.
• Demonstrated interest in expanding beyond traditional penetration testing into broader offensive security and red teaming.
• Ability to clearly communicate technical findings in written reports and verbal discussions.

Strong professionalism, integrity, and attention to detail.