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Klarna • Milan, Lombardy, Italy
Role & seniority
Stack/tools
Penetration testing (white-box/black-box)
Java and Node.js code security
Cloud: AWS, modern microservices
Python scripting and automation
Bug bounty management, external pentest triage
Development of security tooling; support for reconnaissance, metrics
Security training, demos, workshops
Top 3 responsibilities
Conduct white-box and black-box penetration tests against internal and public-facing assets
Manage, triage, and investigate Bug Bounty submissions and external pentest findings; perform variant analysis
Provide expert guidance to developers, product security teams, and SOC; contribute to security program maturity and awareness
Must-have skills
Strong penetration testing and technical security assessment experience
Proven ability to identify security issues in code (Java, Node.js)
Experience with AWS and modern microservice architecture
Clear technical communicator with concrete remediation recommendations
Python scripting and automation skills
Self-driven, proactive, and security-culture oriented
Industry certifications (OSCP/OSWE/CREST/GIAC/AWS) and active CTF/community engagement
Nice-to-haves
Collaborative mindset across diverse, global teams
Experience in Milan or willingness to work there; multicultural environment
Exposure to cutting-edge technologies and challenging scopes
Location & work type
Location: Milan, Italy
Work type: Full-time (on-site/hyb
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!
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