Senior Offensive Security Tester — AI & Cloud Pentesting

Antler; Stockholms kommun; On-site; SEK 600,000 - 800,000; Full time

Job summary

Antler is looking for a Penetration Tester based in Stockholm to own and execute penetration tests across web platforms and cloud infrastructure. The ideal candidate has over 5 years of experience in offensive security techniques and a strong understanding of AI-native products.

This role involves stress-testing user-generated code and collaborating with engineering to remediate security findings, ensuring Lovable's platform remains secure as it scales.

Qualifications

• 5+ years of hands-on penetration testing experience across web, mobile, APIs, and cloud infrastructure.
• Deep expertise in offensive security techniques: OWASP, MITRE ATT&CK, exploit development.
• Experience attacking AI-native products or LLM-integrated systems.
• Strong understanding of cloud environments (GCP, AWS, Cloudflare).

Responsibilities

• Own offensive security end-to-end: plan and execute penetration tests.
• Probe LLM integrations for prompt injection and data leakage.
• Identify systemic vulnerabilities in user-generated code.
• Collaborate with engineering to remediate and verify fixes.
• Run internal red team exercises and contribute to threat modeling.

Skills

Penetration testing

Offensive security techniques

Cloud environments understanding

Translating findings into reports

Collaboration and competition

Tools

SAST/DAST tooling

Job description

Antler is looking for a Penetration Tester based in Stockholm to own and execute penetration tests across web platforms and cloud infrastructure. The ideal candidate has over 5 years of experience in offensive security techniques and a strong understanding of AI-native products.

This role involves stress-testing user-generated code and collaborating with engineering to remediate security findings, ensuring Lovable's platform remains secure as it scales.