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Staff iOS Engineer, App Platform

Whatnot· Engineering
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Hybrid (Remote / US)$170k - $290k + equityFull-timePosted 2w ago

About the role

Role within Whatnot's App Platform team, building the core client infrastructure (iOS, Android, web) to support product teams with stability, performance, shared components, and scalable platform APIs.

Responsibilities

  • Design and maintain the app's core architecture and shared components: modularization, dependency management, navigation, and the patterns product teams build on
  • Build and harden the networking, real-time and persistence layers behind live video, chat and bidding
  • Lead stability and performance work: crash and hang reduction, app launch time, memory, scroll and video performance
  • Partner closely with product teams as an internal consultant: shape scalable designs early, unblock them on hard technical problems, and write the docs and guidance that help them adopt platform work
  • Make sure our infrastructure lets product teams ship features fast and safely
  • Speed up the developer loop: build times, CI, test infrastructure, and release tooling
  • Build observability (crash reporting, performance monitoring, alerting) so we catch regressions before users do

Qualifications

  • Bachelor’s degree in Computer Science, a related field, or equivalent practical experience
  • 8+ years of professional iOS engineering experience, including meaningful time on infrastructure, architecture, or platform work
  • Deep expertise in Swift and iOS fundamentals: runtime, memory management, concurrency (Swift Concurrency and GCD), and the app lifecycle
  • Track record of measurably improving stability or performance (e.g., crash-free rate, launch time, hang rate)
  • Strong partnership skills: treat product engineers as customers, build trust across teams, translate needs into platform priorities
  • Experience designing APIs and frameworks used by other engineers, with good judgment about abstraction, migration paths and adoption
  • Comfort with profiling and debugging tools such as Instruments, crash symbolication, and memory graphs
  • Bonus: experience with app platform ownership and internal developer experience

Skills

Required:iOS EngineeringSwiftAPIs and Frameworks DesignProfiling & DebuggingCross-team Collaboration

Benefits

  • Generous Holiday and Time off Policy
  • Health Insurance options including Medical, Dental, Vision
  • Work From Home Support
  • Care benefits
  • Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4%) and Pension plans internationally
  • Monthly allowance to dogfood the app
  • Parental Leave
Last updated Oct 21, 2026. Interested? Apply on the company site.
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About Whatnot

Whatnot is the largest livestream shopping platform in the U.S.

Whatnot is the largest livestream shopping platform in the U.S., connecting buyers and sellers in real-time across any category – from collectibles like trading cards to comics, fashion, sneakers, and more.

marketplacee-commerce
Company profileWebsite

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