Principal Engineer -Public Edge Infrastructure

Job Description:

What you will do

* Design, build, and operate Klarna's global edge and public infrastructure to support highly available, low-latency services at massive scale
* Lead initiatives to standardize how public-facing services are exposed, secured, and routed globally using edge-native capabilities
* For example: defining reusable patterns so services can be made globally available with minimal bespoke configuration
* Own and evolve edge security and delivery using AWS CloudFront and AWS Web Application Firewall (WAF)
* For example: strengthening baseline protection against abuse while keeping latency low for real users
* Reduce architectural complexity by simplifying traffic flows and removing unnecessary intermediaries
* For example: enabling more direct, edge-to-service communication paths
* Improve observability of public infrastructure across systems
* For example: making it easy to understand how public entrypoints behave and how they relate to backend services
* Collaborate with frontend and platform teams on edge-driven performance initiatives
* For example: caching, prerendering, or similar techniques that move lightweight logic closer to users

Who you are

* A specialist in edge or public infrastructure with deep, hands-on experience in AWS CloudFront and AWS Web Application Firewall (WAF)
* Strong understanding of global traffic management, caching, TLS, routing, and failure modes at scale
* Experienced in designing resilient and secure architectures for critical customer-facing systems
* Experienced in security and traffic protection at the edge
* For example: bot mitigation, rate limiting, or abuse prevention using WAF capabilities
* Strong hands-on experience with infrastructure-as-code AWS Cloud Development Kit (CDK) and Terraform, with the expectation to work with both
* Programming language: TypeScript
* Comfortable working with serverless and managed cloud services such as AWS S3, AWS Lambda, and AWS Step Functions
* Able to reason about both infrastructure and application concerns
* For example: understanding how frontend behavior, backend services, and edge configuration interact
* Collaborative, pragmatic, and motivated by reducing complexity while increasing reliability

Awesome to have

These are areas you might have experience in, or be interested in growing into over time.

* Experience with frontend engineering and modern frameworks such as React
* For example: working with Server-Side Rendering (SSR), hydration, or performance-sensitive rendering paths
* Knowledge of web performance optimisation techniques
* For example: reducing time-to-first-byte or improving perceived load through caching and streaming
* Familiarity with edge execution or serverless request-handling models
* For example: running lightweight logic closer to users
* Experience building or operating observability solutions for large-scale distributed systems
Please include a CV in English.
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