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.
Were seeking individuals eager to achieve remarkable results and share their bold vision to redefine the future of payments and fintech.
Our client: Klarna
Location: Warsaw (hybrid work: 2-3 days in the office)
Duration: long-term agreement
responsibilities :
To take part in building a cross-platform money movement engine seamlessly connecting Klarna users (and non-users) across markets, currencies (incl. crypto), and payment networks
To work as a full-stack engineer with strong backend focus
To build and maintain scalable backend services in Java, Python, and TypeScript
To develop high-performance APIs powering P2P and cross-border money transfer experiences in Klarna’s app and web products
To design and maintain secure, observable, and fault-tolerant infrastructure
To own the full development lifecycle—from design to deploy and monitor
To integrate with third-party money movement APIs (e.g. banking and crypto API providers, banking partners, SEPA, etc.)
To ensure compliance with Klarna’s security, identity, KYC, and AML flows
To build robust and secure payment orchestration and settlement logic
To work with Klarna-internal teams (e.g. Payments, Identity, Customer Support) to reuse or extend foundational capabilities
To understand and plug into Klarna’s existing infra (e.g. PubSub events, internal auth models, mobile architecture)
To build feature-rich AI powered UIs for chat-based money transfers, payment link generation, FX tracking, and transaction history
To contribute to UI codebases (TypeScript/React/React Native) as needed
requirements-expected :
8+ years of experience with Python, JavaScript/TypeScript, React, and React Native
Experience with Redis and PostgreSQL
Strong emphasis on backend development;
Familiarity with AWS services such as DynamoDB, Firehose, and Elasticache
Experience with tools like Datadog and Elasticsearch
Prior experience with Klarna payments API (PACS, OPF, etc.) and understanding of how orders flow through various services from creation to merchant capture
Strong educational background in Computer Science, Information Technology, or a related field
Language proficiency: Advanced English (minimum B2 level)
offered :
Great opportunity for personal development in a stable and friendly large multinational company
Start-up mentality, small agile teams
Global Reach: Impact millions with seamless shopping and payments
