Principal Engineer, Mobile

Summary

Join Stitch Fix as a Principal Mobile Engineer and lead the technical vision for our consumer-facing native mobile applications, primarily focusing on iOS (Swift) and Android (Kotlin). You will shape mobile strategy, evolve architecture, mentor engineers, and collaborate with cross-functional teams. This high-impact role requires 8+ years of mobile development experience with a strong emphasis on iOS and production experience with Android. You will drive continuous improvement, stay ahead of industry trends, and leverage modern frameworks. The position offers a competitive salary, benefits, and equity, including stock units and comprehensive health and wellness benefits.

Requirements

• You have 8+ years of professional experience in mobile development with a strong emphasis on iOS (Swift, UIKit/SwiftUI)
• You have production experience building and maintaining native Android apps (Kotlin)
• You have a deep understanding of iOS architecture patterns, performance tuning, and Apple’s design best practices
• You have a proven ability to influence architecture and long-term engineering direction across teams or functions
• You have a track record of mentoring engineers, providing thoughtful code reviews, and fostering technical growth
• You have experience working in cross-functional teams and collaborating with Product, Design, and Data partners
• You have familiarity with modern tools and pipelines: CI/CD, unit/UI testing, instrumentation, crash analytics
• You have strong communication skills and a passion for solving real user problems with simple & effective mobile solutions

Responsibilities

• Lead technical strategy and architectural decisions for our native mobile apps, focusing on the iOS platform
• Collaborate across teams to deliver innovative, scalable features that drive personalization, conversion, and long-term client engagement
• Provide technical mentorship and thought leadership to mobile engineers across iOS and Android platforms
• Partner with Android engineers to ensure platform parity, shared best practices, and consistent client experiences
• Drive continuous improvement in performance, stability, and code quality across mobile codebases
• Stay ahead of mobile industry trends and help Stitch Fix leverage modern frameworks, tools, and practices

Benefits

• We offer comprehensive compensation packages and inclusive health and wellness benefits
• This role will receive a competitive salary, benefits, and equity
• The position is eligible for new hire and ongoing grants of restricted stock units depending on employee and company performance
• In addition, the position is eligible for medical, dental, vision, and other benefits