Senior iOS Engineer

Your opportunity

At Mollie, we’re on a mission to make payments and money management effortless for every business in Europe.

We started 20 years ago when we launched a more direct, affordable way for companies to get paid. That provided an alternative to the frustrating, overpriced solutions that banks offered at the time.

Today, we serve more than 250,000 businesses across Europe with an all-in-one solution that simplifies payments and money management. And we’re a 850-strong team of product, finance, support, commerce, and engineering specialists working across Europe – from Lisbon to London.

About the role

We're looking for a Senior iOS engineer to build and maintain our payment SDK for iOS. You'll be responsible for designing, developing, and distributing an awesome payment SDK that enables merchants to seamlessly integrate Mollie's payment flows into their iOS applications.

This role sits within a broader mobile and platform ecosystem at Mollie, and over time you’ll collaborate closely with teams shaping shared tooling, release processes, and developer experience across our apps. As the SDK and platform landscape evolves, you’ll have opportunities to contribute to initiatives that improve how mobile features are built, shipped, and maintained across the company.

What you will be doing:

• Design and develop a production-ready iOS SDK from the ground up

• Ensure SDK compatibility across iOS versions and device types

• Build and maintain CI/CD pipelines for automated testing, versioning, distribution, and App Store submission

• Define SDK architecture that balances developer experience with security and compliance

• Build to scale and for a lot of traffic

• Collaborate with platform and app teams to align on shared tooling, release workflows, and mobile infrastructure

What you will bring:

Required:

• Strong iOS development experience with Swift and modern frameworks (UIKit, SwiftUI)

• Minimum of 4 years experience with developing mobile apps

• Experience building and distributing SDKs or libraries consumed by other developers

• Deep understanding of iOS SDK distribution

• Experience setting up CI/CD pipelines for automated testing, versioning, distribution, and App Store submission

• Excellent communication skills, you'll be working closely with merchants and internal teams

• Understanding of API design principles and developer experience considerations

• Create comprehensive documentation to facilitate domain knowledge sharing and set up optimised processes

Nice to have:

• Willingness to develop on React Native applications, including building native bridges/JSI integrations and delivering new features.

• Android SDK development experience (beneficial for future cross-platform alignment)

• Experience with payment processing, PCI compliance, or financial applications

• Knowledge of security best practices for client-side (mobile) payment handling

• Open source contribution history or published SDKs/libraries

• Experience contributing to internal platforms, developer tooling, or shared mobile foundations