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Senior Full-Stack Engineer - Javascript

KlarnaStockholm, SwedenOnsite
We are on a mission
to liberate humanity from all the meaningless time spent managing their purchases and finances, so they can do more of what they love. Klarna was founded on a bold belief: that people are capable of achieving the extraordinary, even when faced with the seemingly impossible. Our journey has been one of continuous learning, facing immense challenges head-on, dedicating countless hours of hard work, and never wavering in our commitment or resilience - and now we are looking for individuals to join us on our journey and contribute to our mission.

Engineering at Klarna is an inspired, customer focused community, dedicated to crafting solutions that redefine our industry. Working in small, highly collaborative Agile teams, you and your team will have a clear mission and ownership of an important outcome that supports Klarna and our customers. At Klarna we optimise for quality, flow, fast feedback, focussing on end-to-end ownership, continuous improvement, testing, monitoring and experimentation. We aim for teams that are inclusive, helpful, and have a strong sense of ownership for the things they build.

Our engineers make some of the most significant decisions for the company and we are looking for bold, open and curious developers. As a Klarnaut, you’ll be inspired to contribute to the growth of one of the World's most highly valued fintech, and your work will impact the lives of our millions of users.We're expanding several of our engineering teams, including; teams working on our core checkout product, payment services, fraud prevention, or improving our billing service and shipping credentials to name a few. Help us make shopping online even more smoooth!

What you'll get to do:


  • Work on a specific problem space critical to Klarna’s current needs with growth opportunities in a fast-paced business.
  • Bring fresh ideas from all areas, including information retrieval, large-scale system design, data storage/processing, security, artificial intelligence, UI design and mobile development.
  • Develop as a professional in an entrepreneurial organisation that provides opportunity to work with your areas of interest.
  • Use state of the art technology to solve real problems for our customers at a massive scale.
  • Design, develop, test, deploy, maintain and improve, you are responsible for the full life-cycle of your code - you write it, you own it.
  • Share your knowledge and help the team evolve best practices; be a mentor and mentee
  • Work in small autonomous teams with short release cycles.
  • Give back by contributing to open source: ​https://github.com/klarna

You should have:


  • A strong coding ability in TypeScript using Node.js
  • Experience with common JavaScript libraries and frameworks.
  • Work experience using React and React Native
  • Experience with product development cloud and microservices.
  • A passion for writing clean and testable code.
  • Experience with Agile practices (Pairing, TDD, BDD, Continuous Integration, Continuous Delivery).

To succeed in this role, we think you should have:


  • Software development experience in JavaScript
  • Strong problem solving ability
  • Growth mindset and bias for action
  • Working proficiency and communication skills in verbal and written English
  • Bachelor’s degree (or higher) in Computer Science or a related discipline or professional working experience building software

Some of the technologies we work with:


  • JavaScript /TypeScript
  • React + React Native with Redux
  • Node.js and Express.js
  • REST API and GraphQL API
  • Kafka
  • Internal design system
  • AWS, Splunk, Datadog, Jenkins and Docker.

What we can offer you


  • Culture - You'll have an opportunity to work in an international company with people from a variety of different countries in a central location.
  • Learning - We have a learning and development focused environment with an emphasis on knowledge sharing, training, and regular internal technical talks.
  • Compensation - You’ll get an attractive salary and compensation package. We recognise that life is more than work, and promote work life balance.
  • We also believe in making contributions back to the open source community. You can find some of our work at https://github.com/klarna.
  • How to apply: please send us your CV or LinkedIn profile in English.

About Klarna


Since 2005 Klarna has been on a mission to revolutionize the retail banking industry. With over 150 million global active users and 2 million transactions per day, Klarna is meeting the changing demands of consumers by saving them time and money while helping them be informed and in control. Over 450,000 global retail partners, including H&M, Saks, Sephora, Macys, IKEA, Expedia Group, and Nike have integrated Klarna's innovative technology to deliver a seamless shopping experience online and in-store.

For more information, visit Klarna.comIt is our commitment that every qualified person will be evaluated according to skills regardless of age, gender, identity, ethnicity, sexual orientation, disability status or religion. Please refrain from including your picture and age with the application.

About Engineering at Klarna


Engineering at Klarna is an inspired, customer focused community, dedicated to crafting solutions that redefine our industry. Working in small, highly collaborative Agile teams, you and your team will have a clear mission and ownership of an important outcome that supports Klarna and our customers. At Klarna we optimise for quality, flow, fast feedback, focusing on end-to-end ownership, continuous improvement, testing, monitoring, and experimentation. We aim for teams that are inclusive, helpful, and have a strong sense of ownership for the things they build. Check out what it's like to be an engineer at Klarna here.

Apply for this job

Life at Klarna

We are Klarna. A global tech bank on a mission to make payments and shopping as smoooth as possible. - We're one of the world's true unicorn companies - We’re valued at over $2.5bn and we're growing by 40% a year - We have more than 2000 employees from more than 70 countries - We process more than a million transactions a day - About 10,000 people are buying with Klarna at any moment of any day - We have developer centres in Stockholm, Berlin and Linden If you're as excited about the future as we are, join us! It’s a hell of a ride.
Thrive Here & What We Value1. Flat hierarchies with knowledge sharing, internal technical talks2. Harmonious team environment with regular employee events3. Generous parental leave for all genders4. Continuous improvement learning-focused culture5. Quality, flow, fast feedback, end-to-end ownership6. Inclusive growth from failures7. Collaborative Agile teams8. Ownership of outcomes supporting Klarna and customers9. Relocation support for employees10. Bold decision-making by developers
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