Senior Mobile Developer, Growth (US)

Nanit is moving families beyond overwhelm by transforming how parents understand their baby's early years. We combine advanced AI, real-world data from billions of sleep hours, and clinical expertise to deliver the clarity and confidence every parent deserves. Trusted by over one million families and backed by $125M in funding, we're building an entirely new category: predictive parenting intelligence. Here, your work directly impacts millions of families. Our team of scientists, engineers, and parents is small but mighty—we share a mission to make early childhood easier, healthier, and more connected.

About the role

You'll be the founding mobile engineer on a new Growth team—a cross-functional squad owning the full customer funnel, from first consideration through purchase, subscription, engagement, and referral. You'll also be the first R&D engineer based at our US site, hybrid, with your manager and the rest of the team in a different time zone. We're looking for someone who holds context, makes decisions, unblocks themselves, and knows when a question is worth asking rather than waiting on a sync.

Responsibilities

• Build and ship features end-to-end across iOS and Android—paywalls, onboarding, subscription flows, in-app messaging, referral mechanics—working at every layer of the client stack with backend, product, design, and QA
• Build the client side of how we measure: feature flags, experiment assignment, event instrumentation—every bet the team makes gets evaluated on data
• Review code, evaluate implementations, and give feedback that raises the bar
• Work with Kotlin Multiplatform and Compose for iOS—we're already building with it, and we'd love to talk if you have experience with KMP or want to grow into it

Requirements

• 5+ years building production mobile apps, on both iOS and Android
• Strong Kotlin and Swift
• Production experience with Jetpack Compose and/or SwiftUI
• Experience owning a project end to end and shipping it
• Solid grounding in OOP, concurrency and clean architecture
• Real care about UX, testing and code quality
• Kotlin Multiplatform experience is an advantage

Benefits

• Hybrid in-office schedule
• Remote work from home month in August
• Flexible PTO (we trust you to take the time you need)
• Equity options so you can share in our growth
• Paid parental leave for all new parents
• Employee discounts on Nanit products
• Work from home stipend
• Monthly team events
• Access to healthcare benefits
• 401(k) plan
• Short-term and long-term disability coverage
• Basic life insurance

Pay

Salary Range: $170,000 to $190,000 base salary + equity and benefits.

Schedule

This is a hybrid role requiring you to be in our NYC office 3 days per week.