Top Senior iOS Developer Jobs in Seattle, WA

Design, architect, implement, and optimize high-performance iOS camera features (primarily Objective-C). Develop and launch stable mobile features, collaborate with Design, perform code reviews, and leverage AI tools responsibly to accelerate development while ensuring performance, security, and production quality.

Own and build native iOS experiences across shopping, checkout, booking, and post‑booking flows. Design and implement technical solutions, write testable and observable code, collaborate with cross‑functional teams, troubleshoot production issues, and safely integrate AI/ML capabilities while ensuring reliability, performance, and operational excellence.

Lead architecture, build, test, and scale Gusto's iOS app and mobile infrastructure. Improve build pipelines, automated testing, release processes, and foundational services (push, accessibility, localization). Collaborate across product, design, security, and infrastructure teams; prototype, iterate, and launch customer-focused features while mentoring engineers.

As a Senior iOS Engineer at Speechify, you'll lead engineering decisions, support product growth, and enhance app architecture, while working in a fast-paced, remote environment.

The iOS Developer will focus on native iOS app development, requiring expertise in building customer-facing applications using Swift. Candidates must have a Computer Science degree and 8-10 years of experience.

The role involves leading key engineering decisions, actively shipping code for the iOS app, participating in product discussions, and enhancing app architecture. Candidates should focus on user experience and product evolution.

Lead development and improvement of a production iOS app used by tens of thousands. Own architecture, UI, networking, local persistence, and automated tests. Collaborate with Android and backend teams, diagnose async and device-specific issues, use Xcode Instruments, CI, and crash/analytics tooling, and drive product-minded technical decisions.

The Senior iOS Engineer will lead engineering decisions, actively ship production code, maintain complex app architecture, and shape product roadmaps.

Senior iOS Developer to design and build secure, high-performance iOS apps using Swift (SwiftUI/UIKit). Implement webview integrations (WKWebView/ASWeb), ASWebAuthenticationSession for OAuth/SSO, JavaScript interop, and native features (camera, push, maps). Ensure responsive web content handling and secure data management. Remote role but must be Bangalore-based with weekly (~1 hour) client office visit to collect a device.

Develop and ship production-quality mobile apps using React Native and native iOS/Android technologies. Write performant, maintainable code, support prototyping, test and debug across devices, and translate product requirements into working features.

Build and enhance iOS applications using cutting-edge technology, collaborating with various teams to develop user-friendly mobile experiences and optimize app performance.

Develop high-quality, performant, accessible consumer-facing experiences for Netflix’s iOS app using Swift and GraphQL. Responsibilities include building maintainable code, automation, documentation, server-driven UI infrastructure, and ad experiences. Collaborate with product managers, designers, and engineering teams to scope projects, refine interfaces, design scalable solutions, and balance business, product, and architectural trade-offs.

Build and own complex iOS account and commerce features from technical design through launch. Develop reliable, performant, accessible experiences using modern declarative UI and unidirectional state architecture. Collaborate with backend, Android, web, product, design, and data science teams to ensure cross-platform consistency. Write tested maintainable code, resolve performance issues, participate in reviews, mentor engineers, and help establish iOS engineering practices for a newly formed team.

Design, build, and maintain scalable, high-performance iOS applications using Swift. Deliver end-to-end features, integrate with back-end services, implement animations and Auto Layout, ensure test coverage and CI/CD, profile and optimize performance, and mentor team members.

The Senior iOS Engineer will lead engineering decisions, participate in product development, ship production code, and enhance the iOS app architecture.

As a Senior iOS Engineer, you will lead product decisions, ship production code, and enhance app architecture within a dedicated team at Speechify.

Lead iOS architecture and deliver native Swift/SwiftUI features for a regulated financial client. Own modularization, state management, CI/CD, testing, secure data handling, API integration, and App Store releases. Mentor a mid-level engineer and enforce compliance and quality standards while leveraging AI-assisted tooling to accelerate delivery.

Develop and maintain iOS applications using Swift and SwiftUI. Implement reactive code with Combine, follow design patterns, write UI/unit tests, profile and fix performance with Xcode Instruments, manage repos with GitHub, integrate crash reporting and analytics, and distribute frameworks via SPM/CocoaPods.

Design, build, and maintain high-quality native iOS applications using Swift and iOS frameworks. Implement UI with UIKit/SwiftUI, handle concurrency, integrate RESTful APIs, ensure unit testing, memory management, and automated code quality in CI/CD pipelines for high-traffic cloud-backed services.

Senior iOS developer to design and build maintainable, performant iOS apps using Swift/SwiftUI and modern concurrency. Build core UI infrastructure, write automated tests (XCTest/XCUITest), participate in code reviews, release apps to the App Store using CI/CD tooling, and partner cross-functionally to define mobile standards.

Senior iOS Developer responsible for building and maintaining native iOS apps using Swift and SwiftUI. Work includes iOS SDK and framework integration, multi-threading, memory management, unit testing, RESTful API integration, cloud/distributed services, CI/CD automation, code quality tooling, and version control collaboration.

Lead technical strategy and architecture for core iOS frameworks, native video playback, and hybrid WebView integrations. Build WebView infrastructure and bridges, optimize performance at scale, develop automated testing and developer tooling, mentor iOS engineers, and drive cross-organizational architectural decisions to improve velocity and maintainability.

Lead ownership of the iOS platform: build offline-first apps with local persistence and sync, real-time communication, media capture/uploads, location/scheduling, and polished, accessible UI/UX for multiple user roles.

Lead design and development of high-performance, offline-capable iOS (iPad) and Android apps for mission-critical drone operations. Build real-time maps, video streaming, telemetry overlays; integrate with hardware; optimize battery, memory, and latency; implement offline-first sync; collaborate with backend/hardware teams; mentor engineers and establish CI/CD, testing, and security best practices.

The Core iOS Senior Engineer will lead mobile development projects, troubleshoot issues, and contribute to code reviews, requiring strong experience in Objective-C and mobile software development.