Senior Offensive Security Engineer - Penetration Tester

What you will do As a Senior Offensive Security Engineer at Klarna, you will be at the forefront of safeguarding our digital infrastructure and customer data. This position demands a blend of hacking skills, creativity, and a deep understanding of cyber threats. You will simulate sophisticated cyber attacks to identify vulnerabilities, ensuring Klarna's resilience against real-world threats. • Conduct white-box and black-box penetration testing against internal and public-facing applications and assets. • Manage, triage, and investigate Bug Bounty submissions and external pentest findings. • Perform variant analysis on issues discovered through all channels. • Research and perform security analyses on Klarna’s 3rd-party solutions. • Develop tooling to support reconnaissance, automation, and metrics collection. • Provide expert guidance to developers, product security teams, and SOC investigations. • Spread awareness of offensive security practices via demos, workshops, and training. • Assess the security of our tech stack and help mature Klarna’s security program. Who you are • Strong experience with penetration testing and technical security assessments. • Experience identifying security issues in code, particularly within Java and Node.js. • Experience with cloud environments, especially AWS and modern microservice design. • Comfortable communicating findings clearly with concrete remediation recommendations. • Skilled in Python scripting and automation. • Self-driven, proactive, and engaged in advancing Klarna’s security culture. • Industry-recognized certifications (e.g., OSCP, OSWE, CREST, GIAC, AWS). • Active participation in CTFs and cybersecurity communities. Awesome to have • Collaboration within a diverse and innovative global team. • Opportunity to work in Milan with a multicultural environment. • Challenging scope with exposure to cutting-edge technologies. Please include a CV in English. Curious to learn more about Klarna and what it’s like to work here? Explore our career site!