Weekend Flutter App Developer Jobs in San Ramon, CA

Job Title: Senior Mobile Engineer iOS

Location: Bay Area, CA - Onsite

FTE(Directly with the client)

We are building a web-scale platform with a GTM-native data architecture that transitions the enterprise from passive data visualization to autonomous execution. We are looking for a foundational Senior Mobile Engineer to own the client s mobile experience end to end. This is a 0-to-1 build: you will define our mobile architecture, ship the first iOS app to enterprise revenue teams, and set the technical direction for Android and shared cross-platform code. Revenue teams live in the field - the mobile surface is where our AI agents meet users at the moment of execution, and you will own that surface.

What You Will Do

• Own iOS from architecture to App Store: Design, build, and ship our native iOS application in Swift and SwiftUI - navigation, state management, offline behavior, background sync, push, and the release and distribution pipeline for enterprise customers.
• Extend to Android and shared code: Establish the cross-platform strategy that lets a small team cover both platforms without shipping two divergent products, and build the shared business, sync, and data layers that back it.
• Make AI agents feel native on a phone: Turn streaming, long-running, and asynchronous agent workflows into responsive mobile interactions - real-time updates, graceful degradation on poor networks, and a UI that stays fast while agents work in the background.
• Build for enterprise-grade constraints: Implement SSO, secure local storage, MDM-friendly distribution, and the observability and crash reporting needed to run mission-critical software inside the world's largest organizations.
• Set the bar for mobile quality: Own performance, accessibility, automated testing, and CI/CD for mobile, and partner closely with design and backend to define the APIs the client actually needs.

What We Are Looking For

• 3+ years of professional mobile engineering experience, with a track record of shipping and maintaining production iOS applications that real users depend on.
• A Bachelor's degree in Computer Science, Electrical Engineering, or a heavily related technical field.
• Deep iOS fluency: You are strong in Swift, know SwiftUI and UIKit and when each is the right tool, and understand concurrency, memory, and the app lifecycle well enough to debug the problems that only show up on real devices.
• Genuine cross-platform capability: You have built for Android or with a multiplatform stack - Kotlin Multiplatform, Compose Multiplatform, React Native, or Flutter - and can reason about the trade-off between shared code and native fidelity rather than defaulting to one answer.
• Product instincts on top of engineering depth: You care about how the thing feels, push back on designs that will not work on a phone, and can translate ambiguous requirements into a shipped experience.
• Comfort with distributed backends: You have worked against real APIs at scale - sync, caching, conflict resolution, auth, and offline-first data - and can hold your own in a design discussion with backend engineers.
• An ownership mentality: You are a driver, not a passenger. You take pride in your work, take accountability for the product on the platform you own, and are comfortable moving quickly in a fast-paced startup environment.
• A strong team player: You are easy to work with, open to constructive feedback, and enthusiastic about learning. You know how to collaborate, raise the bar for the engineering team, and can 'disagree and commit' to keep the team moving forward.

Who You Are

• You are the person who owns mobile at the company - not a ticket-taker on someone else's roadmap. You are comfortable being the only mobile engineer in the room and the most senior voice on the platform.
• You are a high-agency, self-driven builder who thrives in fast-paced environments and takes massive ownership of your work.
• You value true collaboration over ego - you know how to disagree and commit, and you do your best work as part of a highly aligned, fast-moving team.