Mobile Engineer, Treasury

Stripe

WHO WE ARE ABOUT STRIPE Stripe is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Stripe to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. ABOUT THE TEAM We're a mobile engineering team based in Barcelona, focused on building world-class mobile applications that deliver excellent user experiences for Stripe merchants. React Native is at the core of how we build—it lets us move fast, share code across platforms, and ship high-quality experiences to millions of businesses worldwide without compromise. As a Senior Mobile Engineer on our team, you'll help shape our React Native architecture, set the bar for engineering quality, and play a meaningful role in defining what great mobile development looks like at Stripe. This is a high-impact role where your decisions will be felt across the product—and across the millions of merchants who depend on our apps every day. WHAT YOU'LL DO As a Senior Mobile Engineer, you'll own significant parts of our React Native codebase, lead architectural decisions, and help grow the team around you. You'll work closely with product, design, and cross-functional partners to deliver polished, performant mobile experiences. RESPONSIBILITIES * Spearhead the design and development of critical product features, partnering with cross-functional teams to transform complex requirements into seamless, high-performance mobile experiences * Champion the integration of AI and cutting-edge development tools to drive efficiency, elevate code standards, and cultivate a culture of AI-assisted engineering * Own architectural decisions for the mobile layer—including navigation, state management, native module integration, and performance strategy * Drive code quality through thorough code reviews, clear standards, and a strong testing culture * Mentor and support junior and mid-level engineers, helping them grow technically and professionally * Proactively identify and resolve performance bottlenecks across the JS thread, native bridge, and render pipeline, while scaling our mobile CI/CD infrastructure, release processes, and engineering tooling * Act as the primary mobile platform liaison for internal teams, effectively translating requirements into well-scoped mobile initiatives while upholding rigorous standards for code quality and architectural integrity WHO YOU ARE We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. MINIMUM REQUIREMENTS * 5+ years of professional mobile development experience, with a strong focus on React Native * Strong proficiency in TypeScript and modern JavaScript * Solid understanding of mobile app architecture and design patterns (e.g., Flux, Redux, MobX, or similar) * Proven expertise in React Native, encompassing component architecture, performance tuning, and a demonstrated ability to ship and maintain high-quality production applications at scale * Excellent problem-solving skills and ability to communicate complex technical concepts clearly PREFERRED QUALIFICATIONS * * Experience with Expo (managed or bare workflow) * Experience designing and maintaining mobile CI/CD pipelines (e.g., Fastlane, GitHub Actions, Bitrise) * Experience building or contributing to mobile SDKs or shared component libraries * Experience with backend development (REST APIs and GraphQL) * Contributions to open-source React Native libraries or the broader JS and mobile ecosystem * Experience mentoring engineers and contributing to a team's engineering culture * Familiarity with native iOS (Swift, UIKit) or Android (Kotlin, Android SDK) development * Experience working in a remote-first or distributed engineering environment

Hybrus AB

We’re Hiring – Multiple Contract Roles in Stockholm, Sweden. 🔹 Open Positions * Senior Software Engineer, iOS - 3 position * Senior Software Engineer, Android - 1 position Key Skills : Responsibilities ● Design, develop, and maintain the company's iOS application ● Collaborate with cross-functional teams to define, design, and ship new features ● Ensure the performance, quality, and responsiveness of the app ● Debug complex technical issues and identify solutions to improve the app ● Stay up-to-date with new technologies and trends in iOS development ● Write clean, maintainable, and scalable code ● Participate in code reviews and ensure adherence to coding standards ● Contribute to the technical design and architecture of the app ● Participate in the full software development life cycle, including planning, development, testing, and deployment. Essential skills and experience (must have) ● 5+ years of overall experience with iOS development ● Advanced knowledge of programming using Swift ● Deep understanding and several years of hands-on experience in iOS application development (architectures, design, tools, SDKs), asynchronous server communication, and UX optimization ● Experience in debugging and troubleshooting complex systems ● Leading, planning, and executing the development of core features and modules for iOS applications ● Ability to navigate and research requirements in the scope of a big cross-functional team ● Ability to dive into complicated, unique problems, find a clear path forward, and drive the work to a successful conclusion. ● Experience in agile development ● Fluent English skills, oral and written Good to have skills ● SwiftUI experience ● Familiarity with automation tools like GitHub Actions and Fastlane ● Experience with mentoring and onboarding junior team members 📌 Contract Duration: 6 Months (with strong possibility of extension) 🌍 Location: Stockholm, Sweden (On-Site) 💼 Experience: Relevant hands-on project work with Swift & iOS frameworks If you’re passionate about building high-quality iOS applications and want to be part of a growing digital engineering team, we’d love to connect with you! NOTE: THIS IS AN ONSITE ROLE WITH 5 DAY WORK FROM OFFICE, NO REMOTE/HYBRID WORK 👉 Please share your resume at: careers@hybrus.se

Needefy AB

The app layer is where great user experiences come to life. In this role, you’ll work close to the interface, the application logic, and the connection between client apps and background services. It’s a great fit if you enjoy building polished, intuitive iOS experiences while still understanding how the systems behind them work together. What you'll do Build and refine user-facing features in iOS applications, with focus on the application layer, UI, and interaction design. Work with SwiftUI, UIKit, Swift, or Objective-C depending on the codebase and product needs. Translate product and design requirements into clean, maintainable, and testable iOS components. Collaborate with designers, backend engineers, and other app developers to create smooth and reliable user experiences. Ensure that UI components interact effectively with background services, data flows, and asynchronous processes. Improve performance, accessibility, and usability across key user journeys. Debug, refactor, and modernize existing code while balancing quality, delivery, and practical trade-offs. Contribute to technical discussions, code reviews, and continuous improvement of the iOS application architecture. What we’re looking for Problem-solving clarity - Ability to explain your thinking, ask clarifying questions, and iterate from simple to optimized Technical fundamentals - Can reason about complexity, understand practical trade-offs, and write clean code Communication - Easy to talk to, take feedback without defensiveness, and discuss assumptions explicitly Genuine enthusiasm - Show real interest in hard problems, not just getting a job Learning agility - Willing to pick up new technology, work with legacy code, and adapt quickly Must have Computer science fundamentals, including algorithms, data structures, and architecture. Ideally B.Sc. or M.Sc. in Computer Science. 5+ years of professional iOS development experience, including strong hands-on work with SwiftUI, UIKit, Objective-C, or Swift. Understanding of iOS architecture, data flow, and component structure. Ability to write clean, testable, and maintainable code. Basic understanding of asynchronous and concurrent programming. Strong communication skills and enthusiasm for mobile platforms and user-focused app development. Passion for design and user experience. Nice to have Experience with SwiftUI and modern UI patterns, such as MVVM, Combine, etc. Knowledge of animation, accessibility, and performance optimization. Understanding of interaction between UI and background processes. Experience with build and test automation, such as CI/CD, Xcode Cloud. Join a product-focused engineering environment where thoughtful design, clean implementation, and smooth user experiences matter. You’ll work close to the app layer, building iOS interfaces and application flows that feel intuitive, reliable, and well connected to the systems behind them. Öppen för alla Vi fokuserar på din kompetens, inte dina övriga förutsättningar. Vi är öppna för att anpassa rollen eller arbetsplatsen efter dina behov.