Mobile Engineer
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- This is a mobile-first, systems-oriented engineering role centered on a comprehensive fitness platform that combines exercise, sleep, nutrition, wearable, and sensor data to make health tracking more effortless and precise
- The exercise component focuses on functional fitness (box jumps, weightlifting, full-body movements), with the platform built on Swift for iOS, Kotlin Multiplatform (KMP) for shared mobile logic, and a TypeScript-based backend/platform layer
- The engineering scope goes beyond a conventional REST-based mobile app, spanning BLE-connected hardware, high-frequency sensor capture, local persistence and sync, firmware updates, and Apple Watch integration — with AI-assisted and agentic development as a core part of the daily workflow
- Own the iOS application and its technical direction, from architecture through release
- Design and maintain iOS architecture, and make technical decisions for the Apple platform
- Build production features and functionality in Swift
- Work extensively with Kotlin Multiplatform and manage Swift/Kotlin interoperability
- Contribute to shared Kotlin mobile modules where appropriate
- Build and maintain BLE/connected-device integrations
- Work with high-frequency sensor data and reliable local/cloud synchronization
- Contribute to firmware/OTA update functionality
- Support Apple Watch and companion-device integrations
- Collaborate with backend/platform engineers on APIs and contracts
- Contribute to TypeScript/Node.js backend or BFF work when needed
- Translate product and design requirements into production-ready implementations
- Review pull requests, participate in architecture discussions, and maintain engineering standards
- Help define testing strategies and improve automated coverage
- Debug complex mobile, networking, device and synchronization issues
- Use AI agents and AI-assisted tools as part of the everyday workflow, beyond simple autocomplete
- Establish reusable AI-assisted development patterns and project context
- Review AI-generated code critically and understand what's being shipped
- 5+ years of mobile development experience, with substantial production iOS experience
- Experience with Swift, building and maintaining production mobile applications
- Experience with Kotlin Multiplatform (KMP)
- Deep understanding of iOS architecture and native platform development
- Experience with applications beyond straightforward UI and REST API consumption
- Experience with complex application state, networking, persistence, or device integrations
- Ability to work across Swift and Kotlin boundaries
- Deep understanding of concurrency (Swift Concurrency, Kotlin Coroutines)
- Interest in AI-assisted and agentic software development, with the ability to clearly explain how AI tools fit into your engineering workflow
- Based in Brazil
- Strong communication skills in both spoken and written English
- Startup experience
- Experience with CoreBluetooth/Bluetooth Low Energy, connected hardware, watchOS/Apple Watch companion apps, firmware or OTA update systems, high-frequency sensor data, offline-first mobile systems, complex synchronization systems
- Ability to read TypeScript/Node.js and reason about API/BFF contracts between mobile and backend
- Bachelor's Degree in Computer Engineering, Computer Science, or equivalent
