OverviewIn this Lead Engineer role within Klarna's Secure Development team you help design and deliver secure software.
You'll influence architecture decisions, model threats, and drive security improvements across engineering teams.
You'll combine upstream security work with hands-on assessments, including code reviews and penetration testing, plus build tooling that makes secure practices easy to adopt.
This is an opportunity to shape how Klarna ships resilient products at scale.
You'll work in a security-focused culture that values pragmatic, impact-driven engineering.
ResponsabilitàPerform threat modeling for new architectures and designs
Review architecture and design decisions to harden applications and services
Drive security improvements with engineering teams
Build and enhance security tooling, automation, and processes




Conduct security assessments including code reviews and penetration testing
Contribute to Klarna's internal engineering security community
Requisiti fondamentaliExperience with security assessments (code reviews, penetration testing)
Proficiency in at least one language: JavaScript (NodeJS), Python, Go, Erlang, Java, or Scala
Broad knowledge across web/mobile/network security, OS hardening, cryptography, and cloud computing; expert in at least one
Working proficiency in English
Strong communication skills to explain security tradeoffs to non-security engineers
Pragmatic problem solving
Cross-functional collaboration
Clear communication of security tradeoffs
Threat modeling
Architecture and design reviews
Security tooling and automation

📌 Lead Engineer — Application Security (Monza)
🏢 Klarna
📍 Monza