Penetration Tester
First seen by Alion on Oct 21, 2026.
We’re looking for a Penetration Tester who wants to do real security research across web, infrastructure, cloud, AI and mobile environments.
Our work spans web applications, infrastructure and networks, cloud and Kubernetes environments, AI systems, mobile applications, and source code. For us, penetration testing is not just about running tools, it’s about understanding how systems work, challenging assumptions, and conducting real security research.
You’ll report to the Team Lead and work alongside a small team of security researchers in an international, collaborative, and highly technical environment. You’ll work independently on complex problems and together with the team on live client engagements.
We’re looking for someone curious and hungry to learn, someone who goes deep without being told to, would rather understand the system than simply run the tool, and genuinely enjoys security research.
Responsibilites:
Conduct penetration testing and security research across web applications, infrastructure and networks, cloud and Kubernetes environments, AI systems, mobile applications, and source code
Take ownership of security reporting. We use AI tools to accelerate drafting, but you are accountable for the final output — including technical accuracy, root-cause analysis, and real-world business impact
Present vulnerabilities, findings, and recommendations clearly to clients and their technical teams
Build internal security tools, methodologies, automation, and agentic workflows that enable the team to work faster and go deeper
Contribute to red team and adversary emulation engagements
Independently investigate unfamiliar technologies, attack surfaces, and complex technical problems
Must Have Requirements:
3+ years of hands-on experience in penetration testing and/or security research-mandatory
Deep expertise in at least two of the following areas:
Web application penetration testing
Infrastructure and network penetration testing, including Active Directory, with real fluency in Windows and Linux internals, the protocols underneath, and privilege escalation
Manual source code review and vulnerability research
OSCP or CREST CRT certification- mandatory
Currently based in Singapore with valid work authorization- mandatory
Strong research mindset, technical curiosity, and the ability to independently investigate unfamiliar technologies and attack surfaces
Hands-on experience using AI tools to support security testing, research, automation, or tool development, with a strong interest in exploring new AI-driven security workflows
Ability to work independently on deep technical problems and collaboratively on live client engagements
Excellent written and verbal English communication skills
Availability to work in a hybrid model in Singapore, including regular work at client sites
Nice to Have
Existing CAT1 or CAT2A security clearance
Proficiency in Python or Node.js
CREST CCT APP or CCT INF, or Offensive Security certifications beyond OSCP, such as OSWE, OSEP, or OSED
Security research publications, strong CTF performance, or a demonstrated bug bounty track record
Experience with mobile application penetration testing across Android and iOS, as well as thick-client testing
Cloud penetration testing experience across AWS, Azure, or GCP, including containers and Kubernetes
Red team experience, including reconnaissance, adversary emulation, and stealth techniques
AI security expertise, including prompt injection and indirect prompt injection, jailbreaks, RAG and agent security, and the OWASP Top 10 for LLM Applications
Degree in Computer Science, Information Security, Engineering, or a related discipline — or equivalent practical experience
Salary
- Commensurate with experience and qualifications
Skills
Ai, Cyber Security, Active Directory, Escalation Management, Source Code Reviews, Scripting, Test Automation, Web Application Testing, Cloud Infrastructure, Penetration Testing, Operating Systems, Researching New Technologies, Linux, Security Research