Principal Engineer-Client Platform @ Klarna

Principal Engineer-Client Platform

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

OverviewApplication

What you will do

• Own and evolve core parts of the Klarna client platform with a strong React Native focus, shaping foundational capabilities used across the app ecosystem.
• Solve complex, cross-cutting technical problems that impact developer experience, stability, scalability, and long-term maintainability of the platform.
• Lead large initiatives spanning JavaScript and TypeScript, frontend build tooling, native iOS and Android integrations, and CI/CD pipelines.
• Balance short-term delivery needs with long-term platform strategy, ensuring solutions are sustainable and aligned with the broader evolution of the Klarna app.
• Act as a technical multiplier by providing mentorship, conducting thoughtful code and architectural reviews, and guiding engineers toward high-quality platform standards.

Who you are

• A React Native and frontend platform expert with strong platform thinking and a hands-on mentality.
• Deeply knowledgeable about React Native internals, including how it builds, runs, and integrates with iOS and Android.
• Highly proficient in JavaScript and TypeScript, with a strong understanding of runtime behavior and architecture patterns.
• Experienced with frontend build systems and tooling, including bundlers, transpilers, Babel, Metro, and Webpack concepts.
• Comfortable debugging complex runtime and build-time issues across the JavaScript to native boundary.
• Proven in evolving React Native at scale, including managing upgrades, shaping architecture, and improving tooling.
• Solid in basic AWS fundamentals such as compute, IAM, networking, monitoring, and database basics.
• Familiar with CI/CD pipelines and modern delivery practices.
• Knowledgeable in security and privacy fundamentals.
• Comfortable working with Node.js, Express, and database fundamentals.

Awesome to have

• Principal-level problem-solving capability without requiring deep native-specialist expertise.
• Comfortable owning ambiguous, high-impact problems and driving them to resolution.
• Thinks in platforms rather than features, with a systems-oriented mindset.
• Pragmatic and delivery-focused, while remaining opinionated about long-term quality and architectural integrity.
• Actively mentors others, raises the technical bar across teams, and contributes as a collaborative, high-trust team player.

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