Senior Penetration Tester: Web & Cloud Security

SCIENTE INTERNATIONAL PTE. LTD.; Singapore; On-site; SGD 70,000 - 120,000; Full time

Job summary

SCIENTE INTERNATIONAL PTE. LTD. is seeking a Penetration Tester to identify, analyze, and exploit security vulnerabilities across networks, applications, and cloud environments using ethical hacking techniques.

The role requires 3+ years of hands-on experience, strong knowledge of OWASP Top 10, and proficiency with tools such as Burp Suite, Nmap and Metasploit. You will deliver actionable insights, risk assessments, and detailed reports to strengthen security posture.

Qualifications

• Must have 3+ years hands-on penetration testing experience.
• Strong experience in web application and API penetration testing.
• Good understanding of network security, TCP/IP, HTTP/HTTPS, DNS and common network protocols.
• Strong knowledge of OWASP Top 10 and common web vulnerabilities.
• Hands-on experience with Linux and Windows environments.
• Knowledge of Active Directory, privilege escalation and lateral movement.
• Scripting/programming experience in Python, PowerShell or Bash.
• Familiar with penetration-testing tools such as Burp Suite, Nmap, Metasploit and Kali Linux, Wireshark, BloodHound, Impacket and Nessus.
• Strong analytical, problem-solving and report-writing skills.

Responsibilities

• Conduct penetration testing across web applications, APIs, networks, infrastructure and cloud environments.
• Perform vulnerability assessment and validate vulnerabilities through controlled exploitation.
• Identify security weaknesses including OWASP Top 10, authentication/authorization flaws, injection vulnerabilities, misconfigurations and privilege escalation.
• Conduct internal/external network penetration testing and assess network security controls.
• Perform Active Directory security assessments, including privilege escalation, credential attacks and lateral movement.
• Conduct security testing of REST APIs, mobile applications and cloud environments where applicable.
• Develop or customise scripts, payloads and tools to support penetration-testing activities.
• Analyse test results and determine the business impact and risk of identified vulnerabilities.
• Prepare detailed penetration-testing reports including technical findings, evidence, risk ratings and remediation recommendations.
• Work with security and technology teams to validate remediation and perform re-testing.
• Keep up to date with emerging vulnerabilities, exploitation techniques, attack methodologies and security trends.

Skills

Penetration testing

Web API testing

Linux

Windows

Active Directory security

Scripting (Python, PowerShell, Bash)

Report writing

Analytical thinking

Education

Diploma/Degree in Cybersecurity, Computer Science, Information Technology

Tools

Burp Suite

Nmap

Metasploit

Kali Linux

Wireshark

BloodHound

Impacket

Nessus

Job description

SCIENTE INTERNATIONAL PTE. LTD. is seeking a Penetration Tester to identify, analyze, and exploit security vulnerabilities across networks, applications, and cloud environments using ethical hacking techniques.

The role requires 3+ years of hands-on experience, strong knowledge of OWASP Top 10, and proficiency with tools such as Burp Suite, Nmap and Metasploit. You will deliver actionable insights, risk assessments, and detailed reports to strengthen security posture.