Senior iOS Engineer

Employer: Klarna

Location: Warsaw (hybrid work: 2-3 days in the office)

Rate: 170 - 195 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)

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:

-> Build and maintain a high‑performance iOS SDK used by thousands of merchants and millions of end users, focusing on native integrations for Passkeys, Keychain, LocalAuthentication (Face ID/Touch ID), and other platform APIs leveraged by our React Native app;

-> To replace slow JavaScript views with optimized native implementations where appropriate, always prioritizing performance, security, and best practices;

-> Integrate with third‑party partners to deliver smooth and performant native experiences for ID scanning, NFC passport reading, and similar authentication flows, ensuring proper handling of camera access and permissions on iOS;

-> Collaborate closely with cross‑functional teams to drive innovation, maintain quality, and ensure seamless end‑to‑end mobile experiences—optionally contributing to React Native native modules as needed;

-> Work with resilient financial systems and cutting‑edge payment solutions, embracing Agile practices, clean and testable code, and a culture of learning, growth, and continuous improvement;

Your skills and experiences:

-> Extensive experience in iOS development (At least 6 years) with strong proficiency in Swift 

-> In‑depth knowledge of the iOS ecosystem and building reusable frameworks and libraries;

-> Proven track record of writing clean, well‑documented, and testable code for iOS frameworks and applications;

-> Ability to take ownership and drive the development of impactful new features and products;

-> Knowledge of release and sign management of iOS applications, Continuous Integration (CI), and Continuous Delivery (CD);

-> A passion for collaborating with high-performing talented teammates to solve technical challenges;

-> Strong educational background in Computer Science, Information Technology, or a related field;

-> Strong educational background in Computer Science, Information Technology, or a related field;

-> Language proficiency: Advanced English (minimum B2 level).

Nice to have:

+ Cross‑platform: Experience with React Native (native module development for iOS);

+ CI/CD tools: Fastlane (iOS), Jenkins, Bitrise, GitHub Actions;

+ Understanding of APIs: REST, GraphQL;

+ Acquaintance with backend: Node.js, AWS;

+ Familiarity with Datadog, Docker, Kafka;

+ Fintech background: Experience in payments, security, or identity verification domains.

Our client offers:

+ Great opportunity for personal development in a stable and friendly large multinational company;

+ Career growth and additional education;

+ Training courses;

+ Language courses;

+ Company events;

+ Flexible working hours.