Mobile Application Senior Security Engineer
Pubblicato il 19-09-2026 - Klarna in Varese
Overview In this role you will lead offensive security testing for Klarna’s mobile apps, focusing on iOS and Android; you’ll work with engineering teams to turn findings into fixes and improve app hardening. You’ll apply MASVS/MASTG guidelines to drive concrete security improvements, not just produce reports. The role combines hands-on testing, reverse engineering, and collaboration to reduce risk in a fintech mobile ecosystem. This is a hands-on position in a fast-moving security team with real impact on product security.
Responsabilità
- Run offensive security assessments (penetration tests, red-team exercises, vulnerability discovery) on Klarna’s mobile apps (iOS/Android)
- Reverse‑engineer app binaries to uncover sandboxing, permission, and core security weaknesses
- Test against OWASP MASVS/MASTG and translate results into actionable fixes with engineering teams
- Evaluate and stress‑test app-hardening and RASP protections
- Document findings in actionable formats and ensure fixes are implemented in production
Requisiti fondamentali
- Hands-on offensive mobile security experience (pentesting, red teaming, bug bounty, or security research) against iOS/Android
- Strong understanding of mobile internals: sandboxing, permissions, security architectures of iOS and Android
- Fluent with mobile security tooling (Frida, Objection, MobSF, jadx/apktool, Ghidra/Hopper, Burp Suite, mitmproxy)
- Familiarity with OWASP MASVS/MASTG as primary framework for security assessments
- Experience with app-hardening and RASP; fintech/payments app security a plus
- Published CVEs, talks, or track record in mobile security or bug bounty (bonus)
- Experience shipping production mobile code or similar
- Familiarity with Play Integrity/App Attest and device-binding schemes (premio)
- Collaborative mindset
- Strong written and verbal communication with engineers
- Curiosity and meticulous attention to detail
- OWASP MASVS/MASTG
- Frida
- Objection