Our client: Klarna
Location: Warsaw (hybrid work: 2-3 days in the office)
Rate: 220 - 255 PLN per hour
Cooperation model: B2B
Start date: ASAP
Duration: Long-term agreement
Recruitment process: 1 timed Abstract and Logical Reasoning Test (up to 15 minutes); 1 short interview (up to 30 minutes)
Technology stack: Python, AWS, AI (Large Language Models, OpenAI API)
Do you want to play a key role in revolutionizing the future of finance? Join Klarna - a global leader in deferred payments, with over 85 million active users and 2.5 million transactions processed daily! As a pioneer in modern payment solutions, Klarna is developing innovative methods that streamline the shopping experience, enhance transaction security, and expand the availability of purchasing options.
We're seeking individuals eager to achieve remarkable results and share their bold vision to redefine the future of payments and fintech. Send us your CV - we can’t wait to meet you!
Your role is:
- > to develop and maintain Python-based microservices that support the Client’s LLM-powered tools (such as Rejection Bot, Appeal Bot, and Timeline Bot) as well as future AI-driven internal platforms;
- > to connect and interact with Klarna APIs (PTX, Decision Store, OSIS) and third-party services (like Kiki, FullStory, and Slack);
- > to track and enhance system performance using tools like Datadog and Langsmith, focusing on key metrics such as latency, error rates, and user experience;
- > to work closely with teams across Product, Data Science, Legal, and Customer Service to deliver AI solutions that are scalable, compliant, and centered on user needs;
- > to promote engineering best practices—including code reviews, continuous integration/deployment, Docker usage, thorough testing, and a microservices approach—within a fast-moving, growth-oriented team.
Your skills and experiences:
- > more than 10 years of programming experience, ideally with past roles as a Lead or Tech Lead;
- > strong command of Python, with hands-on experience developing RESTful APIs using frameworks like FastAPI, Flask, or Django;
- > solid knowledge of cloud platforms, particularly AWS services like Lambda, ECS, and others, along with a deep understanding of microservices architecture;
- > genuine interest in artificial intelligence; experience with LLMs, natural language processing, or prompt engineering is a plus;
- > familiar with CI/CD pipelines, Docker, and Git to support efficient and reliable deployments;
- > excellent communication skills, with the ability to collaborate effectively across both technical and non-technical teams;
- > proficient in AWS cloud technologies, including Serverless, Lambda, Redshift, S3, and EC2);
- > advanced English language skills (B2 level or higher).
Our client offers:
+ Great opportunity for personal development in a stable and friendly large multinational company.
+ Career growth and additional education.
+ Company events.
+ Global Reach: Impact millions with seamless shopping and payments.
+ Flexible working hours.
If interested, please apply safely through this portal (application rules are in accordance with GDPR). Employment agency Nr 17138.
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