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Posted 3mo ago

Lead Fullstack Engineer - Javascript

@ Klarna
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Stockholm, Stockholm, Sweden
kr753k-kr1077k/yrOnsiteFull Time
Responsibilities:lead design, develop applications, deploy services
Requirements Summary:Proficient in TypeScript/JavaScript, Node.js, React/React Native; experience designing scalable, distributed systems; AWS proficiency; strong communication; English proficiency; able to mentor and drive engineering culture.
Technical Tools Mentioned:TypeScript, JavaScript, Node.js, React, React Native, AWS, Kafka, Docker, Jenkins, Datadog, Splunk
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Job Description

What you will do

• Work on specific problem spaces critical to Klarna's needs, with opportunities to switch teams as both you and our fast-paced business evolve.

• Lead the design, development, and maintenance of JavaScript-based applications, ensuring high performance, scalability, and reliability across both frontend and backend.

• Work with modern technologies such as TypeScript, Node.js, React, and React Native to build seamless and scalable solutions.

• Utilize cloud technologies, primarily AWS, to develop and deploy services.

• Engage in the full project lifecycle—from conception to deployment and beyond—ensuring projects are delivered on time and to specifications.

• Collaborate with cross-functional teams across Klarna to align on integration strategies and optimize system architecture.

• Drive an engineering culture within the team, emphasizing innovation, quality, and continuous improvement.

• Proactively identify and mitigate potential issues in our distributed and financial systems.

• Work in small autonomous teams with short release cycles.

Who you are

• Proficient in TypeScript and JavaScript, with strong experience in Node.js and modern frontend frameworks (e.g., React / React Native).

• Experienced in architecting and building scalable, robust systems across the stack.

• Skilled with cloud technologies, especially AWS.

• Adept in distributed systems, with the ability to anticipate and mitigate issues proactively.

• Independent, able to manage projects end-to-end and contribute to technical direction.

• A strong communicator, capable of collaborating effectively across teams and domains.

• Experience mentoring others and contributing to a positive engineering culture.

• Working proficiency and communication skills in verbal and written English.

Awesome to have

• Experience with microservices architecture and event-driven systems.

• Familiarity with REST and/or GraphQL APIs.

• Experience with tools such as Kafka, Docker, Jenkins, Datadog, or Splunk.

• Experience working in fintech or other regulated environments.


Please include a CV in English.

Curious to learn more about Klarna and what it’s like to work here? Explore our career site!