security engineer in fintech

Klarna is building an everyday finance network that helps over 120 million consumers across 26 countries save time and money and worry less about their finances.

• Run white-box and black-box penetration tests against internal systems and public-facing applications;
• Manage, triage, and investigate Bug Bounty submissions and external pentest findings;
• Perform variant analysis on issues surfaced through any channel, tracing where else the same class of bug might exist;
• Research and assess the security of Klarna's third-party solutions and integrations;
• Build tooling for reconnaissance, automation, and metrics collection;
• Guide developers, product security teams, and SOC investigations with hands-on expertise;
• Run demos, workshops, and training that spread offensive security practices across Klarna;
• Assess the security of Klarna's tech stack and help mature the security program overall.

• 5+ Years of experience running penetration tests and technical security assessments against production systems;
• Ability to read code and find real vulnerabilities, particularly in Java and Node.js;
• Experience operating in AWS and reviewing microservice architectures for security gaps;
• Ability to document findings with clear remediation steps;
• Ability to script tooling in Python;
• Initiative to advance offensive security independently;
• Nice to have: OSCP, OSWE, CREST, GIAC, or AWS security certification; active participation in CTFs or the broader security research community; public security research such as CVEs, conference talks, or published tooling.

• The position is based in Klarna's Milan office;
• Most teams currently meet in person 2–3 days per week; this varies by team and can change over time;
• Final compensation is based on the candidate's qualifications, skills, and experience.