Senior Application Security Engineer

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About Us

At Klarna, our mission is to smooth commerce and make it easier and safer for people to shop and pay for their purchases. With our focus on customer obsession and commitment to transparency and accountability at the heart of everything we do, we are proud to be a trusted partner to 85 million consumers and 575,000 retailers across 45 markets.

Our amazing talented people and innovative technologies enable us to deliver this mission and we believe that we are making a positive impact on society and helping to drive the global economy forward.

What You Will Do

• Perform threat modeling, architecture and design reviews. Help design hard-to-break applications and services.
• Take an active role in architectural decisions. Work with engineering teams and drive security improvements.
• Continuously build and improve our security tooling, automation and processes.
• Perform security assessment (code reviews and penetration testing) of Klarna services.
• Contribute to the internal engineering security community.

Who we Are
The team is missioned to empower engineers to design, build, and deliver secure software swiftly through standardized tools and processes, continuous learning, and fostering a security-focused culture within Klarna's engineering division.
We help engineering prevent and solve flaws that arise in the planning and development phases through architecture reviews, threat modeling, and various automated tools and processes.

Awesome to Have

• A pragmatic approach to solving security issues in ways that achieve the best effect
• Great problem-solving abilities
• Experience in writing and reviewing code in at least one of the following programming languages: JavaScript (NodeJS), Python, Go, Erlang, Java or Scala
• Advanced knowledge and understanding in various disciplines: web application security, mobile app security, network security, operating system internals and hardening, applied cryptography, cloud computing. You're expected to be an expert in at least one of these areas.
• Working proficiency in English
  

Nice to Have

• Experience in penetration testing, source code review, design review, threat modeling, security mitigation development, or security tooling development
• Participating in BugBounty and CTF
• Effective communication skills that engage your audience

Klarna's Compensation model and Equity Offering
At Klarna, our compensation package includes a base salary and Restricted Stock Units (RSUs). To ensure fairness and maintain global market competitiveness, each role in a specific location has a set base salary. During the recruitment process, we will assess your skills and experience to determine which role is the best fit for you.
Our RSU program features a 4-year vesting schedule, allowing you to gradually become a shareholder in Klarna. Additionally, you may qualify for our Contribution-Based Reward (CBR) program, which recognizes and rewards significant contributions to our success.

Total Compensation:
81 990 - 91 828 EUR

Closing
Please include a CV in English.

Department Engineering Locations Warsaw, Poland, Berlin, Germany, Milan, Italy, Stockholm, Sweden Employment type Full-time About Klarna
Since 2005, Klarna has been on a mission to reimagine how consumers spend and save in their daily lives. We help people save time and money and reduce financial worry. With over 85 million global active users and 2.5 million transactions per day, our vision is a world where Klarna empowers everyone, everywhere, through seamless financial and commerce experiences—as a personalized, trusted assistant making financial empowerment effortless.

Over 575,000 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.

Founded in 2005 Co-workers 3,800 Turnover $2.5bn Apply! Engineering · Multiple locations Senior Application Security Engineer