Senior Engineer. Mobile Applications

December 31, 2025

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About the position

The Senior Engineer, Mobile Applications will contribute to the design, development, and delivery activities of a cross-functional engineering team. Through strong hands-on technical contributions focused heavily on mobile applications, the Senior Engineer will contribute to technical excellence across key strategic initiatives. The Senior Engineer will partner closely with a Technical Lead to identify innovative solutions to user and business challenges using leading technology and delivery practices. They will also work closely with Data, Security, Infrastructure, and Operations teams using our technology delivery methodology and our ways of working. As a member of a growing team, you'll also play a role in shaping and defining the team's culture. You'll get the benefits of a fast-paced environment in an environment where teamwork, culture, and collaboration are paramount. This is a hybrid role based out of our Hampton, NH office.

Responsibilities

Implements the technical architecture of a platform or product, moving from architecture to design to high-quality software.
Contributes to design and implementation decisions.
Provides hands-on mentorship and guidance to more junior engineering team members, fostering skill growth and innovation.
Champions best practices in system design, development, testing, and deployment, including AI-powered engineering capabilities.
Rapidly delivers solutions that amaze users and drive business outcomes as part of a cross-functional team.
Works across engineering, infrastructure, data, and security teams.
Executes against delivery plans that take advantage of cutting-edge technologies to deliver solutions that exceed expectations.
Anticipates and mitigates risks early in the development cycle, ensuring scalable and resilient solutions.
Advocates for strong engineering approaches while balancing technical feasibility and business priorities.
Makes strong hands-on contributions to implementation, testing, and operations.
Establishes pragmatic, repeatable approaches for writing, validating, and shipping high-quality software.
Contributes to the adoption of modern engineering practices, including CI/CD pipelines, automated testing, observability, and cloud-native patterns.
Embraces a culture of continuous learning, experimentation, and technical excellence.
Serves as a role model for engineering values, instilling ownership, craftsmanship, and pride in delivery.

Requirements

Bachelor's degree in a related field (Computer Science, Computer Engineering, Management Information Systems, etc.). Master's degree a plus
5+ years of software engineering experience as part of a cross-functional delivery team
Breadth and depth of experience in implementation of mobile applications. This includes a proven track record of driving stories to completion and collaborating across a cross-functional teams to deliver an outcome
Deep hands-on experience is native mobile application languages (e.g., Swift, Kotlin), user interfaces (e.g., SwiftUI, Jetpack Compose), and supporting tooling (e.g., Firebase, Sentry)
Should have a practical understanding of RESTful service design and be skilled in integrating with synchronous and asynchronous APIs.
Solid analytical and problem-solving skills, with the ability to tackle ambiguous problems and make data-driven decisions
Strong attention to detail, efficient, and organized with an ability to establish priorities and objectives
Excellent presentation and communication skills along with the ability to communicate effectively across all levels of the organization
Able to establish and maintain effective, collaborative work relationships with diverse individuals, internally and externally
Dedicated learner with a natural curiosity for consistent growth
Exhibits comfort, ease, and flexibility working in an extremely fast-paced ever-changing, deadline-driven environment
Cooperative team player with an upbeat, positive, “can-do” attitude!

Nice-to-haves

Experience with CI/CD pipeline development and AI-powered engineering tooling is a strong plus
Experience using Generative AI (GenAI) user-facing software products or applications is also highly desirable
Experience with GraphQL is also helpful but not required

Benefits

Planet 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.

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