Senior Software Engineer - Mobile

Human Interest provides retirement benefits to employees at small and medium-sized businesses. The Senior Software Engineer on the Mobile team will build and ship mobile experiences for employees and plan administrators, establish the mobile engineering foundation, and own architecture and release practices.

Responsibilities:

• Build a polished experience across iOS and Android, native or cross-platform, that helps employees understand and grow their retirement savings, plus future experiences for 401(k) plan admins to manage plans on the go
• Architect a modern, modular codebase from scratch, with modern concurrency, clean dependency management, and testability at its core, and no legacy constraints
• Use AI coding agents as a core part of how you build, directing them across the development lifecycle as the architect and decision-maker and helping shape the team's agentic workflows and quality bar
• Solve hard fintech problems on mobile: accurate, real-time balances, secure authentication and biometrics, and protecting sensitive financial data
• Own how we ship: CI/CD, phased App Store and Play Store rollouts, feature flags, and automated UI testing, with crash-free rates and app ratings as your scoreboard
• Sweat the details with Design, from animations and haptics to data visualization and accessibility, so saving for retirement feels as good as any consumer app
• Partner with backend engineers on API contracts and backend-driven UI, and help define our native and cross-platform direction

Requirements:

• 5+ years of experience building and maintaining software in production, including shipping and owning consumer mobile apps through many App Store and Play Store release cycles
• Deep expertise in native mobile development (Swift and SwiftUI, or Kotlin and Jetpack Compose) or cross-platform frameworks (React Native, Flutter, Kotlin Multiplatform), with strong opinions on app architecture, performance, and testing
• Experience owning features end to end, from technical design through release and iteration, in a collaborative, cross-functional environment
• Hands-on, regular use of agentic coding tools such as Codex, Claude Code, and Cursor on production work
• Sound judgment on where AI helps and where it does not, and the habit of keeping agent-generated code correct, secure, and well-tested
• Deep technical background in mobile software engineering across native and cross-platform stacks, with strong computer science fundamentals, including data structures, concurrency, and asynchronous programming
• Solid understanding of mobile architecture trade-offs, performance tuning, device farms, automated UI testing (XCUITest, Espresso, Appium), client-side telemetry (Sentry, Firebase, Datadog), and API contract design
• Desire to work with our backend stack (Node, TypeScript, Kotlin, AWS)
• A commitment to accessibility and to writing well-tested, maintainable code
• Top-notch communication, both verbal and written: you can work well with engineers and non-engineers alike
• A strong product sense and an eye for craft: you notice dropped frames, awkward transitions, and inaccessible UI, and you fix them
• A proactive, empathetic mindset and a bias toward ownership: you roll up your sleeves to solve problems for our customers, mentor through code reviews, and raise the bar for those around you
• Typically requires a Bachelor's or Master's degree in Computer Science, Engineering, or a related field
• Experience taking a mobile app from 0 to 1 is a plus, whether at a startup, a larger product company, or an established financial services firm
• Experience with fintech, security-sensitive applications, or regulated domains is a plus