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 (SwiftUI, 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 TestFlight builds and deployment to the Apple App Store.

Establish scalable iOS application leveraging SwiftUI 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 SwiftUI, UIKit, Combine, SwiftData, 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 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
• Experienced 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 scaling companies from early stage to major exits.
• Principles-Driven Culture: Work in a culture that values speed, ownership, and impact—what most companies achieve in 90 days, we do in 45.
• Comprehensive Compensation Package: Competitive salary, performance bonuses, equity, and robust benefits package, including paid health, vision, dental, and disability coverage.

Note: This role will be hybrid for those in the NYC metro or remote for those in the Denver metro area (but with the expectation of periodic in-person collaboration)

Compensation Range (New York City): $177,000 – $218,000
Compensation Range (Denver Metro): $157,000 – $192,000

*The posted range reflects the base salary for this role across the market ranges for each location. Final compensation will depend on a variety of factors, including experience, skills, internal leveling, and market conditions, and will be offered within the stated range in accordance with applicable pay transparency laws.

If you’re excited to contribute to a high-bar team building something meaningful, we love to hear from you!