Senior Mobile Engineer – iOS

Monstro is an AI-native fintech platform reimagining how people and institutions manage money. We’re building a modern foundation for financial decision-making—combining intelligence, automation, and elegant design to help users make smarter choices with confidence.
Our team includes experienced builders from leading fintech, wealth management, and technology companies, united by a shared goal: to create a category-defining product that transforms how financial insight is delivered and acted on.

We’re looking for a Senior iOS Engineer to build the native iOS experience for our financial platform. You’ll 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. This is a hands‑on, collaborative role where your work will directly shape the core experience our users rely on every day.

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). Deliver smooth, intuitive user experiences that support complex financial workflows. 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 leveraging Swift

UI architectural patterns such as async/await and data flows. Optimize performance, responsiveness, offline/online behavior, and data persistence. Build for speed and correctness in a regulated environment.

Integrate the mobile client with backend APIs, financial data systems, and third‑party providers. Work closely with backend engineers to shape efficient API interactions and ensure seamless real‑time data flows within the app.

Implement secure data handling practices required for financial applications. Ensure proper encryption, secure storage, authentication flows, and session management. Build with the rigor necessary for regulated, high‑trust environments.

Partner with product managers, designers, and fellow engineers to deliver cohesive, user‑centered features. Contribute to architectural discussions, planning, and code reviews. Support engineering excellence through documentation, testing, and raising the overall technical bar.

• 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 org.
• The app consistently meets performance and security standards suitable for a regulated financial environment.
• You’ve elevated 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 across 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 tradeoffs 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 insecure data handling, including encryption, authentication/authorization flows, key management, and platform security…