Senior Software Engineer, iOS

Thrive Market•Los Angeles, CA

21d•Hybrid

About The Position

This Senior Software Engineer, iOS role is central to Thrive Market’s next phase of growth. Our iOS app serves our most engaged members and is a critical driver of how customers discover, evaluate, and shop an ever-evolving catalog. As the business continues to invest in personalization, experimentation, and modern product development, we’re expanding our iOS capabilities to ensure the platform can scale with both customer demand and product ambition. In this role, you’ll help evolve our iOS app from a legacy-heavy foundation into a modern, maintainable, and high-velocity codebase. Near-term, that means stabilizing the platform, reducing technical debt, and leading the migration to a modular architecture and modern design system. Longer-term, you’ll partner closely with Product and Design in a true Product Triad to build deeply personalized, data-informed shopping experiences, leveraging analytics, experimentation, and ML-driven insights to help members discover the right products at the right time.

Requirements

7+ years of iOS development experience
Strong proficiency in Swift; ability to work in mixed Swift/Objective-C codebases
Strong understanding of application architecture and the “why’s” behind it
Experience with LLM coding assistants. Familiarity with the current state of agentic development
Experience with SwiftUI and UIKit
Experience with MVVM or similar architectural patterns
Experience with reactive programming (Combine, RxSwift, or ReactiveObjC)
Experience with local persistence and caching strategies
Experience writing unit tests and working with mocks/test doubles
Understanding of dependency injection and writing testable code
Familiarity with modular architecture using Swift Package Manager (SPM)
Familiarity with Git and collaborative development workflows
Experience migrating legacy codebases (Objective-C → Swift, UIKit → SwiftUI)

Nice To Haves

E-commerce or consumer app experience
Familiarity with analytics platforms (Amplitude, etc.)
Experience with A/B testing / feature flagging (Optimizely, LaunchDarkly)
Experience with accessibility implementation (VoiceOver, Dynamic Type)

Responsibilities

Lead the end-to-end design and implementation of complex features.
Maintain high code quality through rigorous code reviews, unit testing, and adherence to SOLID principles.
Identify and resolve bottlenecks, memory leaks, and crashes to ensure a 99.9% crash-free session rate.
Work alongside Product Managers to translate business requirements into technical specifications and realistic sprint goals.
Stay at the forefront of the Apple ecosystem (WWDC updates, Swift evolution) and integrate relevant technologies into our workflow.
Contribute to the growth of the team by sharing knowledge, documenting best practices, and participating in architectural discussions.
Building a deeply personalized shopping experience that makes every member feel like the app was built just for them.
You’ll be a key player in migrating legacy UIKit components into a modular, reactive architecture with a Design System DSL.
You’ll partner closely with Product, Design, and Engineering in a tight feedback loop (the "Product Triad"), ensuring we aren't just shipping code, but solving the right problems for our members.
From butter-smooth animations to ensuring our app is accessible to everyone, you’ll be the guardian of the "look and feel" of our iOS experience.
You'll join an engineering culture committed to moving from scrappy startup mode to mature systems mode, with opportunities to take on meaty, impactful engineering projects.

Benefits

Comprehensive health benefits (medical, dental, vision, life and disability)
Competitive salary (DOE) + equity
401k plan
9 Observed Holidays
Flexible Paid Time Off
Subsidized ClassPass Membership with access to fitness classes and wellness and beauty experiences
Ability to work in our beautiful office in Playa Vista
Free Thrive Market membership with exclusive employee discount
Coverage for Life Coaching & Therapy Sessions on our holistic mental health and well-being platform

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