Principal Engineer -Public Edge Infrastructure @ Klarna

Principal Engineer -Public Edge Infrastructure

Engineering - Engineering · Stockholm, Milan · Full-time · kr 1,076,536 SEK - kr 1,248,781 SEK

OverviewApplication

What you will do

• Work as a hands-on Principal Engineer and own Klarna’s public edge architecture — the global entrypoint for all customer and partner traffic.
• Design and build the next-generation edge platform that public services rely on for secure, reliable, low-latency traffic handling.
• Define how services are exposed, secured, routed, and monitored at the edge — and implement the core patterns in production code.
• Design and implement the technical foundation for migrating 500+ production public endpoints to a scalable and secure model. For example: building reusable patterns so services can be made globally available with minimal custom configuration.
• Own and evolve edge security using AWS CloudFront and AWS WAF, defining secure-by-default patterns aligned with OWASP principles. For example: bot mitigation, rate limiting, and protection against common web attacks while keeping latency low.
• Simplify traffic flows and reduce architectural complexity at scale. For example: enabling more direct edge-to-service communication paths.
• Design and implement clear observability patterns for public infrastructure. For example: making it easy to understand how public entrypoints behave and how they relate to backend services.
• Build AI-assisted developer tooling that embeds edge standards directly into workflows. For example: using coding agents and reusable Claude-based skills to help teams migrate endpoints safely.
• Lead through engineering — write production code, ship core components, and set standards through working implementations.

Who you are

• A deeply hands-on expert in public or edge infrastructure with strong experience in AWS CloudFront and AWS Web Application Firewall (WAF).
• You have personally designed and built large-scale, customer-facing systems operating at significant traffic levels.
• You have led architectural change by building reference implementations and enabling others to follow.
• You have strong TypeScript mastery and write production-grade infrastructure code and tooling in TypeScript (AWS CDK), with high standards for abstraction design and maintainability.
• You understand global traffic management, caching, TLS, routing, distributed system failure modes, and performance trade-offs.
• You have strong knowledge of web security fundamentals (e.g., OWASP Top 10) and experience applying edge protections such as bot mitigation and rate limiting.
• You are comfortable making architectural decisions with long-term impact and balancing security, performance, cost, and developer experience.
• You enjoy building systems yourself and reducing complexity through well-designed abstractions.

Awesome to have

• Experience with frontend engineering and modern frameworks such as React, especially in performance-sensitive environments.
• Strong knowledge of web performance optimization, including caching strategies and improving time-to-first-byte.
• Experience with edge execution or serverless request-handling models.
• Experience building AI-assisted developer tooling or automation systems.
• Experience defining infrastructure patterns adopted across multiple teams.
• Experience with other large-scale CDN or edge platforms such as Cloudflare, Fastly, or Akamai.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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