Staff iOS Engineer (San Francisco)

Job Description

Job Description

Join us in a high-impact role where you’ll craft a world-class iOS experience that powers AI social media workflows for creators. At Scrollmark, we’re building SocialGPT (https : / / www.gpt.social / ), your copilot for social media content creation—helping creators and brands plan, create, and grow with confidence.

We’ve raised $8M in seed funding from top-tier investors including Mayfield and Jackson Square Ventures. As an early-stage startup, we’re looking for a senior iOS engineer who obsesses over performance, polish, and creator workflows. You’ll work directly with our CTO and partner across product, design, and backend—owning features end-to-end, from prototype to App Store release. You’ll also set the roadmap and mentor / hire as we scale.

We’ve raised $8M in seed funding from top-tier investors including Mayfield, Jackson Square Ventures, Lemniscap, Shakti, and Aperiam. As an early-stage startup, we’re seeking team members who combine technical expertise with a self-starter attitude. Reporting directly to our CTO and collaborating closely with other engineering leaders, you’ll have the autonomy to drive projects that make a lasting impact.

What You’ll Do

Build the Next-Generation Creator App (iOS) : Design and ship a fast, intuitive, native iOS app (Swift / SwiftUI, UIKit where it fits) that makes content planning, creation, and publishing feel effortless.

Design and Integrate AI Workflows : Build frontend flows to present insights and suggestions generated by SocialGPT in the most impactful way

Performance & Usability at 60fps : Own app responsiveness, animations / haptics, offline-first UX, background uploads, and startup time using Instruments, signposts, and proactive profiling.

Collaborate & Iterate : Prototype quickly with design and product, run user studies with creators, and refine based on in-app analytics, crash-free rate, and p99 UI latency.

Scale & Ship Reliably : Set up feature flags, TestFlight cohorts, release notes, and crash / trace monitoring.

Strategize & Lead : Contribute to roadmap and design system; establish mobile best practices, code standards, and testing (unit / snapshot / UITests) ; mentor teammates as we grow.

What We’re Looking For

5+ Years Shipping iOS Apps : You’ve built and maintained production iOS apps with meaningful scale and ratings, and you can point to features you owned end-to-end

Expertise in Swift / SwiftUI (and UIKit where pragmatic) : Strong command of async / await, Combine (or equivalents), navigation patterns, state management, and accessibility

Product & System Design : Translate creator needs into elegant flows; design scalable architectures (modularization, dependency injection, background tasks, data sync, caching)

Media & Performance Chops : Hands-on with AVFoundation / PhotoKit, background processing, offline caching, networking, and rigorous performance tooling (Instruments, MetricsKit)

Platform Integrations & Quality : Experience with notifications, widgets, deep links, share extensions, authentication, analytics / experimentation, and App Store submission guidelines

Self-Starter, Creator-Obsessed : You thrive in ambiguity, ship with craft, and care deeply about the details that make creators faster and more confident

Nice-to-Haves :

Core ML (on-device assist features), design systems, Android or cross-platform awareness (KMP / Flutter / RN), privacy / security best practices for media apps.