Lead iOS Engineer, Product Engineering

About UsFounded in 1992 in Dover, NH, Planet Fitness is one of the largest and fastest-growing franchisors and operators of fitness centers in the world by number of members and locations. As of March 31, 2026, Planet Fitness had approximately 21.5 million members and 2,909 clubs in all 50 states, the District of Columbia, Puerto Rico, Canada, Panama, Mexico, Australia and Spain. The Company’s mission is to enhance people’s lives by providing a high-quality fitness experience in a welcoming, non-intimidating environment, which we call the Judgement Free Zone. Approximately 90% of Planet Fitness clubs are owned and operated by independent business owners.At Planet Fitness, our unique mission has always been to enhance people’s lives by providing a high-quality fitness experience in a welcoming, non-intimidating environment. And we’re proud of the amazing Planet Fitness team that supports our clubs and team members. They are comprised of dynamic, dedicated, and talented individuals who represent our values of integrity, transparency, passion, respect, and excellence (while having fun!) in everything they do.Joining the PF family means being part of a company that cares about bettering the health and wellbeing of our communities. It means being a part of a supportive, engaging workforce with an inclusive culture that values diversity and creates an environment where everyone can feel they belong. It means encouraging professional growth and development. It means making true, lasting connections with your co-workers with celebrations, team building activities and engaging corporate events! It means creating a positive impact in our local communities through our Judgement Free Generation philanthropic initiative. It means being part of a brand that you can be proud of!For the past 30 years, we’ve helped millions of people in their fitness journey and revolutionized the industry along the way. And we’re just getting started!OverviewThe Lead iOS Engineer is a leading velocity contributor for a cross-functional delivery Pod, responsible for shaping, reinforcing, and executing the technical direction of iOS applications. They drive the design, implementation, and testing of high-quality, scalable mobile solutions, ensuring strong alignment with modern iOS best practices and user experience standards.They play a critical role in accelerating team delivery by identifying and addressing technical and process bottlenecks, applying pragmatic engineering approaches, and maintaining a high bar for code quality, performance, and reliability. As a senior member of the team, they contribute meaningfully across the full mobile development lifecycle—from architecture and development through testing, release, and ongoing optimization.The Lead iOS Engineer works closely with Product, Design, and cross-functional engineering partners to deliver user-centric solutions that meet both business and technical objectives. They bring a strong passion for the iOS platform, championing technologies like Swift, SwiftUI, and Liquid Glass Design, while staying current with evolving platform capabilities and industry trends.They also serve as a mentor and technical leader within the team, supporting the growth of junior engineers, promoting best practices, and contributing to a culture of continuous improvement, collaboration, and engineering excellence.This role follows a hybrid schedule and requires regular, in-person work at our Boston, MA or Hampton, NH office. Our hybrid model is M/T/W in office and TH/F are optional work-from-home. Candidates must reside within commuting distance of one of these locations. Fully remote work is not available for this role.ResponsibilitiesTechnical ContributionsActively contributes to the design, implementation, and testing of iOS applications using Swift, SwiftUI (with limited UIKit as needed), and modern architecture patterns (MVVM, MVI, Clean Architecture).Identifies and removes delivery and quality bottlenecks (e.g., build performance, app performance, release friction) through pragmatic, scalable solutions.Applies modern iOS practices, including CI/CD, automated testing (unit and UI), observability, and performance monitoring.Champions iOS platform excellence, including Human Interface Guidelines (HIG), accessibility, responsiveness, and device compatibility.Contributes to the iOS technical vision and helps evolve mobile architecture and standards.Leverages AI-powered tools to improve development efficiency and shares learnings with the team.Acts as a trusted advisor on iOS-specific design, architecture, and platform capabilities.Champions best practices (lifecycle management, state handling, performance optimization, modularization) through code reviews and mentorship.Cross Functional CollaborationExecutes delivery plans using modern iOS technologies to build performant, user-centric mobile experiences.Proactively identifies and mitigates risks related to performance, device fragmentation, and platform constraints.Collaborates closely with Product and Design to deliver intuitive, high-quality experiences aligned with Human Interface Guidelines (HIG) principles.Partners with backend and platform teams to ensure seamless integration and efficient, reliable releases (including App Store rollout strategies).High Quality Development and DeliveryEnsures quality through strong testing practices, monitoring, and iterative release cycles.Team and Culture BuildingSupports and mentors junior engineers, strengthening team capabilities in Swift, SwiftUI, and modern iOS development.Contributes to a high-performance, inclusive engineering culture grounded in trust, accountability, and collaboration.Advocates for mobile excellence across performance, usability, accessibility, and platform consistency.Promotes continuous learning, experimentation, and adoption of modern iOS tools and practices.Leads by example with strong ownership, craftsmanship, and pride in delivering high-quality mobile experiences.A deep passion for the platform and helping improve the lives of millions of people.QualificationsBachelor's degree in a related field (Computer Science, Computer Engineering, Management Information Systems, etc.). Master's degree a plus5+ years of software engineering experience, with a strong focus on building and delivering iOS applications in cross-functional teamsStrong proficiency in Swift and modern iOS development, including SwiftUI and core Apple frameworks (Combine, SwiftData/Core Data, Navigation), requiredDeep understanding of iOS fundamentals (lifecycle, state management, concurrency (async/await, GCD), threading, performance optimization), requiredExperience with modern architecture patterns (MVVM, MVI, Clean Architecture) and modularized codebasesExperience with iOS testing (XCTest, XCUITest, Appium) and mobile CI/CD pipelinesFamiliarity with Human Interface Guidelines (HIG) and building accessible, responsive UIs across diverse iOS devicesExperience integrating RESTful APIs and working with asynchronous patterns (async/await, Combine); GraphQL is a plusExperience with mobile observability and monitoring tools (e.g., Firebase, Datadog)Knowledge of cloud platforms (AWS, Azure, GCP) and mobile-backend integration patternsExperience with App Store release processes, versioning, and staged rolloutsKnowledge of defining, measuring, and improving key iOS performance metrics (e.g., startup time, jank/frame drops, hangs/watchdog terminations, crash-free sessions, memory and battery usage), with experience leveraging profiling and observability tools to drive continuous performance improvementsExperience with AI-assisted development tools or AI-enabled features is a plusStrong problem-solving, communication, and collaboration skills, with the ability to operate effectively in fast-paced environmentsStrong attention to detail, efficient, and organized with an ability to establish priorities and objectivesExcellent presentation and communication skills along with the ability to communicate effectively across all levels of the organizationAble to establish and maintain effective, collaborative work relationships with diverse individuals, internally and externallyDedicated learner with a natural curiOSity for consistent growthExhibits comfort, ease, and flexibility working in an extremely fast-paced ever-changing, deadline-driven environmentCooperative team player with an upbeat, positive, "can-do" attitudePerksPlanet Fitness cares about you and your well-being. We offer a comprehensive benefits package to eligible employees which includes the core medical, dental, vision, life and disability as well as supplemental accident, hospital and critical illness coverage options. In addition, we are proud to offer eligible employees a generous time off program (including volunteer time), childcare reimbursement, paid parental leave, pet care reimbursement, tuition reimbursement, free Black Card membership, learning and development programs and a whole host of engagement activities. We offer a 401(k) Plan with safe harbor employer matching and an employee stock purchase plan. This role is also eligible to participate in an annual corporate bonus incentive program based on company financial and personal performance.The salary for NH-based and MA-based employees hired into this role will be aligned with the range below. This is a good faith estimate, and the amount of base salary will correspond with a candidate’s professional experience, qualifications and internal equity.Annual Base Salary Range: $130,000-$150,000Note to Applicants: We have been made aware of an increasing number of hiring fraud schemes across numerous platforms. Planet Fitness never requires advance payments of any kind for computer equipment or any other purpose at the start of employment. Any request for you to provide payment information during the application process is part of a fraud scheme. Further, we recommend that you do not provide sensitive personal information (SSN, DOB, driver’s license number) as part of the initial application process.Job SummaryJob ID: 2026-20842Category: Information TechnologyType: Full TimeName: Hampton, NH (preferred) or Boston, MAZip: Postal Code: 03842