Senior Mobile Engineer — iOS & Android

Location: Remote · Must work core hours in U.S. time zones · for a strong fit for overlap

Employment Type: Full-time · Available as contract (Talent on Demand)

Works with: Lead Developer and a Backend Developer

About the Company

We are a rapidly growing U.S.-based, AI-native product studio. We take companies from idea to launch-ready software in weeks, then partner with them through fast, two-week sprints to build and scale production systems. We have shipped 200+ products and hold a high bar on engineering quality even as we move quickly. Our team is fully distributed, and every engineer owns meaningful, visible work.

About the Role

We are building a mobile app for one of our clients — from first project setup through public App Store and Google Play release. The app is offline-first and built for frontline users on low-end devices and unreliable networks, so reliability and performance matter as much as features. We need a mobile engineer who can own the app end to end and ship four to five features per two-week sprint.

This is an AI-first environment. Tools like Cursor, Claude Code, and coding agents write most of the first draft; you direct them, review every diff, and own what ships. Speed comes from tooling and judgment, not from skipping tests, reviews, or acceptance criteria. We are looking for a genuine engineer who uses AI to go faster, not someone who leans on it in place of craft.

Key Responsibilities

Project Setup & Release

Set up the iOS and Android projects, developer accounts, build pipeline, and release tracks
Run TestFlight and Play testing tracks, store listings, privacy disclosures, and review submissions and fixes

Offline-First Architecture & Sync

Build an offline-first app: actions queue locally and sync once on reconnect, with no duplicate submissions and clean conflict handling
Define the sync and upload APIs with the backend developer, and debug across the client-server boundary

Core Mobile Features

Implement phone-number sign-in with SMS one-time codes and device binding
Build push notifications with SMS fallback
Build camera document capture with compression and on-screen guidance
Build in-app confirmation and e-signature flows that produce versioned, tamper-proof records
Build a localized, bilingual interface

Performance & Device Optimization

Tune for low-end Android phones and poor connections: app size, memory, bandwidth, and startup time

Quality & Monitoring

Add crash reporting and sync monitoring, and test on real devices across the supported range
Ship fast without lowering the bar: automated tests, CI, and reviews that catch what AI gets wrong

Required Qualifications

4+ years building mobile apps, with at least one app shipped to both the App Store and Google Play
Hands-on experience with offline-first data and sync: local storage, queued writes, retries, and conflict handling
Experience with authentication, push notifications, camera, and file upload on both platforms
Experience optimizing for low-end Android devices and poor networks: app size, memory, and bandwidth
Experience working through App Store and Play review, including privacy disclosures
Comfortable agreeing API contracts with backend developers and debugging across the client-server boundary
Daily, hands-on use of AI coding tools (Cursor, Claude Code, or similar) on production mobile work, with a workflow you can walk us through
A track record of shipping fast without lowering the bar: automated tests, CI, and reviews that catch what AI gets wrong
Strong written and spoken English — clear pull requests, early risk flags, and the ability to explain tradeoffs to a client team
Able to work core hours in U.S. time zones

Preferred Qualifications

Experience with in-app e-signature or document workflows
Experience building apps for frontline, field, or hourly workers
Experience localizing apps, or Spanish (helpful for testing, though not required)
Some backend experience — enough to help with platform work after the app ships
Experience setting up agent workflows, project rules, or custom prompts that make a whole team faster with AI

Ideal Candidate Profile

You are a mobile engineer who has carried an app all the way to both stores and lived with it in production. You design for the worst network and the cheapest phone, not just the demo. You think about what happens when a user loses signal mid-action, when a retry fires twice, when a device gets swapped. You write clearly, flag risks early, and can agree an API contract with a backend engineer without friction. You use AI to move fast, and you review everything it writes.

Why Join Us

You will own a real app from an empty project to a public store release, ship visible work every sprint, and build for users who actually depend on it. If you want to do frontier AI-assisted mobile work on a lean, high-standards team, this is that seat.

Senior Mobile Engineer - iOS & Android - 21905