Sr. iOS Developer (onsite, NYC or Chicago)

Job Description Publicis Sapient role overview

• At Publicis Sapient, we help organizations unlock value through digital business transformation—building products and platforms that matter to our clients and their customers.
• As a Senior iOS Developer, you will lead the design and development of scalable, high-performance mobile applications using modern iOS frameworks and architectural principles.
• You will collaborate across product, design, and engineering teams to deliver seamless, accessible, and data-driven user experiences while shaping engineering practices and mentoring team members.
• This role combines deep technical expertise with ownership, enabling you to influence mobile strategy, architecture, and delivery in a fast-paced, client-focused environment.

Your Impact

• Design, build, and maintain a robust, scalable multi-module iOS codebase using Swift and SwiftUI with clear modular boundaries and separation of concerns
• Collaborate with Product, UX, Design, and backend teams to translate requirements into polished user experiences and scalable design systems
• Build and evolve a reusable component library in SwiftUI with a scalable design token system and custom theming capabilities
• Apply architectural patterns (MVVM, Clean Architecture, etc.) to ensure a principled, testable, and maintainable codebase
• Develop local orchestration engines using BGTaskScheduler, Swift Concurrency (async/await, actors), and Combine for managing background and long-running tasks
• Design and maintain battery-efficient background location tracking solutions using Core Location (CLLocationManager, geofencing, significant-change monitoring)
• Implement feature flagging mechanisms (Firebase Remote Config, LaunchDarkly, etc.) to support experimentation, controlled rollouts, and rollback strategies
• Integrate and maintain analytics pipelines (Firebase Analytics, Mixpanel, etc.) and enforce event taxonomy and schema governance in collaboration with Product and Data teams
• Ensure accessibility standards (WCAG 2.1 AA, VoiceOver, Dynamic Type, touch target sizing) are embedded across the UI and design system
• Shape CI/CD pipelines (Xcode Cloud, GitHub Actions, Fastlane) with automated quality gates and performance regression checks
• Implement APM and performance monitoring tooling (Firebase Performance, New Relic, MetricKit) for application health and optimization
• Leverage AI-assisted development tools (e.g., GitHub Copilot, Claude) and agentic workflows to accelerate development and reduce repetitive tasks
• Mentor and support junior and mid-level engineers, contributing to team growth, engineering quality, and knowledge sharing

Qualifications Your Skills & Experience

• Strong experience building iOS applications using Swift
• Hands-on expertise with SwiftUI and modern UI architecture
• Experience designing scalable mobile architectures (e.g., MVVM, Clean Architecture)
• Proven experience building modular codebases and reusable UI component systems
• Experience working with concurrency models (async/await, Combine, background processing)
• Solid understanding of mobile performance optimization, including memory, CPU, and battery usage
• Experience integrating analytics frameworks and implementing event tracking systems
• Familiarity with feature flagging, experimentation frameworks, and release management practices
• Experience with CI/CD pipelines and mobile build/release tooling
• Strong debugging, problem-solving, and system design skills
• Experience collaborating in cross-functional Agile teams

Set Yourself Apart

• Experience building and scaling enterprise-grade mobile platforms
• Deep understanding of accessibility standards and inclusive design practices
• Experience with design systems, token architecture, and UI theming strategies
• Exposure to observability, monitoring, and performance tuning at scale
• Experience mentoring engineers and influencing engineering best practices
• Demonstrated alignment with Publicis Sapient core values such as Learning Mindset, Inclusive Collaboration, and Partnering for Client Impact
• Experience applying AI-assisted workflows in production development environments
• Contributions to open-source iOS projects or technical communities

Additional Information Salary Range: $96,000-$161,000

The range shown represents a grouping of relevant ranges currently in use at Publicis Sapient. Actual range for this position may differ, depending…