iOS Engineer, App Platform

Apply; California (MO); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible time off

Health insurance (medical, dental, vis

WFH support

Job summary

Whatnot is seeking an iOS Engineer on App Platform to help build the infrastructure and building blocks used by our product teams across iOS, Android, and web.

You will architect core components, strengthen networking and persistence, and push for app stability and scalable design systems, ensuring the easiest path to ship high‑quality features.

Qualifications

• Bachelor's degree in computer science or related field.
• Proficiency in Swift and iOS fundamentals with SwiftUI-based UI architecture.
• Proven track record delivering user-facing features quickly.
• Strong product instincts and user-centric thinking.
• Bonus: e-commerce or social product experience; familiarity with AB testing, analytics, or growth tooling.

Responsibilities

• Architect and maintain core components and design system used by multiple apps.
• Strengthen networking and persistence layers to improve performance and reliability.
• Drive app stability and crash reduction across platforms.
• Collaborate with product teams to make the best implementation easy to adopt.

Skills

Swift

iOS

SwiftUI

Shipping features

Education

Bachelor's degree in CS or related

Job description

Role

App Platform is Whatnot's client infrastructure team, building the consistent, reliable foundation that every product team builds on top of across iOS, Android, and web. Rather than owning a single feature surface, the team pushes technical boundaries so product pods can move fast without sacrificing quality — owning things like app stability, the Whatnot Design System, localization, core components, and the shared architecture that keeps our apps performant and consistent at scale.

As an iOS Engineer on App Platform, you'll focus on the infrastructure and building blocks that feature teams rely on: architecting and maintaining core components and the design system, strengthening our networking and persistence layers, driving app stability and crash reduction, and partnering closely with product teams to make sure the "right way" to build is also the easiest way. It's a high‑leverage role for someone who wants their work to compound across the entire app rather than a single feature.

We offer flexibility to work from home or from one of our global office hubs, and we value in‑person time for planning, problem‑solving, and connection. Team members in this role must live within commuting distance of our New York, Seattle, San Francisco, or Los Angeles hub.

You

• A bachelor’s degree in Computer Science, a related field, or equivalent work experience.
• Proficiency in Swift, with a deep understanding of iOS fundamentals and SwiftUI‑driven UI architecture.
• Proven track record of delivering user‑facing features. You are known for shipping products and features lightning‑fast.
• Excellent product instincts. You first think about users rather than the best technical solution.
• Bonus:
  • Experience with e‑commerce or social products.
  • Familiarity with A/B testing frameworks, analytics instrumentation, or growth experimentation tooling.

Benefits

• Flexible Time Off Policy and Company‑wide Holidays (including spring and winter break)
• Health Insurance options including Medical, Dental, Vision
• Work From Home Support
  • Home office setup allowance
  • Monthly allowance for cellphone and internet
• Care benefits
  • Monthly allowance for wellness
  • Annual allowance towards childcare
  • Lifetime benefit for family planning, such as adoption or fertility expenses
• Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4% of base salary) and Pension plans internationally
• Monthly allowance to dogfood the app
  • All Whatnauts are expected to develop a deep understanding of our product. We're passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!).
• Parental Leave
  • 16 weeks of paid parental leave + one month gradual return to work *company leave allowances run concurrently with country leave requirements which take precedence.

EOE

Whatnot is proud to be an Equal Opportunity Employer. We value diversity, and we do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability status, or any other status protected by local law. We believe that our work is better and our company culture is improved when we encourage, support, and respect the different skills and experiences represented within our workforce.