Sr. iOS Developer (onsite, NYC or Chicago)

Company descriptionPublicis Sapient is a digital transformation partner helping established organizations get to their future, digitally enabled state, both in the way they work and the way they serve their customers. We help unlock value through a start-up mindset and modern methods, fusing strategy, consulting, and customer experience with agile engineering and problem-solving creativity. United by our core values and our purpose of helping people thrive in the brave pursuit of next, our 20,000+ people in 53 offices around the world combine experience across technology, data sciences, consulting, and customer obsession to accelerate our clients’ businesses through designing the products and services their customers truly value.OverviewPublicis Sapient role overviewAt 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.ResponsibilitiesYour ImpactDesign, build, and maintain a robust, scalable multi-module iOS codebase using Swift and SwiftUI with clear modular boundaries and separation of concernsCollaborate with Product, UX, Design, and backend teams to translate requirements into polished user experiences and scalable design systemsBuild and evolve a reusable component library in SwiftUI with a scalable design token system and custom theming capabilitiesApply architectural patterns (MVVM, Clean Architecture, etc.) to ensure a principled, testable, and maintainable codebaseDevelop local orchestration engines using BGTaskScheduler, Swift Concurrency (async/await, actors), and Combine for managing background and long-running tasksDesign 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 strategiesIntegrate and maintain analytics pipelines (Firebase Analytics, Mixpanel, etc.) and enforce event taxonomy and schema governance in collaboration with Product and Data teamsEnsure accessibility standards (WCAG 2.1 AA, VoiceOver, Dynamic Type, touch target sizing) are embedded across the UI and design systemShape CI/CD pipelines (Xcode Cloud, GitHub Actions, Fastlane) with automated quality gates and performance regression checksImplement APM and performance monitoring tooling (Firebase Performance, New Relic, MetricKit) for application health and optimizationLeverage AI-assisted development tools (e.g., GitHub Copilot, Claude) and agentic workflows to accelerate development and reduce repetitive tasksMentor and support junior and mid-level engineers, contributing to team growth, engineering quality, and knowledge sharingQualificationsYour Skills & ExperienceStrong experience building iOS applications using SwiftHands-on expertise with SwiftUI and modern UI architectureExperience designing scalable mobile architectures (e.g., MVVM, Clean Architecture)Proven experience building modular codebases and reusable UI component systemsExperience working with concurrency models (async/await, Combine, background processing)Solid understanding of mobile performance optimization, including memory, CPU, and battery usageExperience integrating analytics frameworks and implementing event tracking systemsFamiliarity with feature flagging, experimentation frameworks, and release management practicesExperience with CI/CD pipelines and mobile build/release toolingStrong debugging, problem-solving, and system design skillsExperience collaborating in cross-functional Agile teamsSet Yourself ApartExperience building and scaling enterprise-grade mobile platformsDeep understanding of accessibility standards and inclusive design practicesExperience with design systems, token architecture, and UI theming strategiesExposure to observability, monitoring, and performance tuning at scaleExperience mentoring engineers and influencing engineering best practicesDemonstrated alignment with Publicis Sapient core values such as Learning Mindset, Inclusive Collaboration, and Partnering for Client ImpactExperience applying AI-assisted workflows in production development environmentsContributions to open-source iOS projects or technical communitiesAdditional informationAn inclusive workplace that promotes diversity and collaboration.Access to ongoing learning and development opportunities.Competitive compensation and benefits package.Flexibility to support work-life balance.Comprehensive health benefits for you and your family.Generous paid leave and holidays.Wellness program and employee assistance.As part of our dedication to an inclusive and diverse workforce, Publicis Sapient is committed to Equal Employment Opportunity without regard for race, color, national origin, ethnicity, gender, protected veteran status, disability, sexual orientation, gender identity, or religion. We are also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If you need assistance or an accommodation due to a disability, you may contact us at View email address on click.appcast.io Range: $96,000 - $161,000 annual salary