Senior Mobile Security Engineer - Offensive Pentesting (iOS/Android)

Klarna

Greater London

Hybrid

GBP 110,000 - 150,000

Full time

5 days ago

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Job summary

Klarna is hiring a Mobile Application Senior Security Engineer in London to own offensive security for Klarna’s mobile surface. You will perform penetration tests, red-team exercises, and binary reversals to expose sandboxing and permission weaknesses before attackers do.

You’ll work with engineers to turn findings into concrete fixes while aligning with MASVS/MASTG guidelines. The role emphasizes collaboration with multiple teams, hands-on testing across iOS and Android, and delivery of

Qualifications

Hands-on offensive mobile security work on iOS/Android.
Knowledge of mobile internals: sandboxing and permissions.

Responsibilities

Run offensive security assessments against Klarna's iOS and Android apps.
Reverse‑engineer app binaries to surface weaknesses before attackers.
Test apps against MASVS/MASTG and translate results into fixes with engineering teams.
Evaluate and stress-test app-hardening and RASP protections with teams.
Document findings so engineers can act on them.