Senior Mobile Engineer – iOS

Senior Mobile Engineer – iOS at Monstro

Join Monstro, an AI‑native fintech platform reimagining how people and institutions manage money. We are building a modern foundation for financial decision‑making—combining intelligence, automation, and elegant design to help users make smarter choices with confidence.

We are looking for a Senior iOS Engineer to build the native iOS experience for our financial platform. You will design and deliver secure, high‑performance features that help users understand and manage their financial lives, while laying the foundation for a long‑term mobile architecture.

Monstro's mobile app is central to how users interact with their financial universe. Your work will define the quality, responsiveness, and trustworthiness of that experience. The systems you build must be secure, elegant, and resilient—handling sensitive financial data at scale while remaining intuitive and reliable.

• Design, build, and maintain core features using Swift and modern iOS frameworks (Swift
  
  UI, UIKit, Combine, Swift Testing, Swift Data).
• Own feature development end‑to‑end—from architecture to implementation, testing, and release, including Test Flight builds and deployment to the Apple App Store.
• Establish scalable iOS application architecture using Swift
  
  UI patterns such as async/await and data flows.
• Optimize performance, responsiveness, offline/online behavior, and data persistence.
• Integrate the mobile client with backend APIs, financial data systems, and third‑party providers.
• Implement secure data handling practices for financial applications, ensuring proper encryption, secure storage, authentication flows, and session management.
• Collaborate with product managers, designers, and fellow engineers to deliver cohesive, user‑centered features, contribute to architectural discussions, and support engineering excellence through documentation and testing.

• The iOS experience is fast, secure, and delivers exceptional clarity for users managing complex financial information.
• The mobile codebase is maintainable and scalable, supporting rapid iteration without sacrificing quality.
• Architecture patterns are consistent, well‑documented, and trusted across the engineering organization.
• The app consistently meets performance and security standards suitable for a regulated financial environment.
• You elevate the craft, practices, and expectations of mobile engineering at Monstro through thoughtful execution and collaboration.

• 7‑10+ years of professional iOS development experience.
• Expert‑level proficiency in Swift and modern iOS development, with deep hands‑on experience in Swift
  
  UI, UIKit, Combine, Swift Data, async/await, and modern testing practices.
• 5+ years of experience building, shipping, and maintaining production iOS applications, including ownership of large features or full apps in live environments.
• Proven ability to design and evolve scalable iOS architectures, making thoughtful trade‑offs around performance, maintainability, and developer experience.
• Ability to lead by example, conduct high‑quality code reviews, mentor engineers, and influence best practices across the team.
• Experience integrating with RESTful APIs and managing complex data flows.
• Strong expertise in secure data handling, including encryption, authentication/authorization flows, key management, and platform security best practices.
• Skilled in debugging, performance tuning, and optimizing for real‑world usage.
• Experience with multi‑language support.
• Technical ownership mindset, driving quality, reliability, and security across the iOS codebase and release lifecycle.
• Experience with CI/CD pipelines for iOS, including Apple's CI/CD pipeline.
• Genuine passion for the craft of building software and curiosity to keep learning.
• Clear communicator who takes ownership and moves with urgency.
• Experience with accessibility best practices is preferred.

• Ownership & Impact:
  Shape the future of AI‑powered finance—building a category‑defining product used by consumers and institutions around the world.
• Elite Team:
  Join a leadership team with a track record of…