> Markdown version of [/jobs/ext/3533964-app-platform](https://www.wearedevelopers.com/jobs/ext/3533964-app-platform). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # App Platform - **Company:** Whatnot Inc. - **Location:** Seattle, WA, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Continuous Integration, Data Infrastructure, Software Debugging, Memory Management, Open Source Technology, SQLite, WebSocket, Concurrency, Caching, Modularization, Core Data, Information Technology, Performance Monitor, Build Tools, Graphql - **Published:** October 1, 2026 - **Apply:** https://startup.jobs/staff-ios-engineer-app-platform-whatnot-com-8759590 ## About the Role People who do well at Whatnot tend to be comfortable figuring things out as they go, biased toward action, and genuinely curious about what they're building. They care more about outcomes than credit and stay close to the product and the people using it. * 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: the runtime, memory management, concurrency (Swift Concurrency and GCD), and the app lifecycle * A track record of measurably improving stability or performance, for example crash-free rate, launch time or hang rate * Strong partnership skills: you treat product engineers as your customers, build trust across teams, and can turn their needs into platform priorities * Experience designing APIs and frameworks that other engineers use, with good judgment about abstraction, migration paths and adoption * Comfort with profiling and debugging tools such as Instruments, crash symbolication, and memory graphs * Bonus: + Real-time or media experience: WebSockets, AVFoundation, live video + Experience with experimentation, feature-flagging, or analytics infrastructure on the client + Experience scaling a large iOS codebase or team: modularization, build systems (Bazel, Tuist, SPM), or CI/CD + Experience with GraphQL clients, offline and caching strategies, or local persistence (Core Data, SQLite, GRDB) + Contributions to open-source iOS libraries or tooling ## Description 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. What you'll do * 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 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.