Mobile App Development Company in San Francisco

The figure moves with the build type: a focused MVP for a Bay Area consumer or fintech app built at SF quality, a full production app with custom backend, real-time features, payments, subscriptions through RevenueCat, deep analytics through Amplitude or Mixpanel, and SOC 2-aligned controls, or multi-surface platforms with iPad and Apple Watch companions, Android tablet layouts, and ongoing feature velocity. Scope drivers include iOS and Android (either both native or one cross-platform build), Stripe or Apple Pay integration, push notifications, analytics, App Store and Play Store submission, and a TestFlight beta cohort. SF rates sit above most US markets because of the Stripe, Cash App, and Uber engineering premium, but we deliver from Edmonton and Chandigarh on PST hours, so you get Bay Area quality without Bay Area headcount cost. Fixed-fee proposals only, no open T and M.

Both, and we will give you a straight answer on which is right for your product economics. Native iOS in Swift and SwiftUI is the right call for apps with serious camera, ARKit, Core ML, Live Activities, Dynamic Island, HealthKit, or HomeKit integration, or where the SF investor pitch hinges on Apple-platform polish (Cash App, Strava, Calm-tier finish). Cross-platform React Native with the New Architecture or Flutter 3 is the right call for marketplace, content, or B2B apps where iOS and Android need feature parity on a single roadmap and the budget cannot support two native teams. We have shipped both. We also know when to mix: a React Native shell with native iOS modules for the camera and AR surfaces is a common Bay Area pattern. We will scope honestly during discovery rather than pushing whatever framework our bench happens to know best.

We treat App Store Review as a real workstream from day one, not a launch-week scramble. Every build ships with App Privacy Nutrition Labels filled out against actual SDK behavior, ATT prompt copy that survives Apple Reviewer scrutiny, IDFA usage justification when relevant, Sign in with Apple wired correctly alongside any third-party social login, and in-app purchase plumbing that respects the current Apple guideline language on external links and pricing. When Apple Review pushes back (and on any non-trivial app, they will), we draft the Resolution Center response, escalate through Apple Developer Relations and DTS when needed, and only loop your CTO in if there is a real product call to make. Most of our SF clients have not had a personal interaction with Apple Reviewer Relations since we took over submission. That is the bar.

The California Consumer Privacy Act and its 2023 successor the California Privacy Rights Act apply to most apps with California users. We map data collection against the CPRA categories during discovery, build the access, deletion, and opt-out flows the law requires inside the app and in the support workflow, publish the in-app privacy notice and Do Not Sell or Share toggle, and ship App Privacy Nutrition Labels and Play Data Safety forms that match the actual data flow. For apps where any user could be under 18, California AB 2273 (Age-Appropriate Design Code) raises the bar on default privacy settings, dark pattern avoidance, age estimation, and Data Protection Impact Assessments. We handle the DPIA documentation and the default-on privacy settings during build, not as a retrofit after the AG opens an inquiry. COPPA applies on top for anyone clearly targeting under-13.

Yes. Stripe is headquartered on Townsend in SF and is the default we wire into most Bay Area mobile apps, with Apple Pay and Google Pay sitting on top of Stripe for in-app checkout where Apple guidelines allow it (physical goods, services, ride-hailing, food delivery). For account linking and ACH, we wire Plaid (SF HQ), which most SF fintechs already have a commercial relationship with. For card issuing and programmable spend, we wire Marqeta (Oakland HQ). For Cash App Pay integration we wire through Block's SDK. For in-app purchases of digital goods and subscriptions, we route through StoreKit 2 and Google Play Billing with RevenueCat managing the cross-platform subscription state. We have shipped Face ID and biometric auth gates on top of all of these, KYC document capture through Persona or Onfido, and FinCEN-aligned transaction monitoring for fintech clients facing CFPB and OCC scrutiny.

Most of our SF mobile clients are YC alumni (W23 onward, with steady volume across the W24 and W25 batches) or post-YC seed and Series A teams. We have shipped MVPs that took companies from Demo Day pitch to App Store launch in under twelve weeks, and we have inherited React Native codebases from earlier offshore vendors and rebuilt them on a New Architecture migration path that the next investor diligence pass will actually respect. We sit in YC office hours on Zoom when founders want us there, we run synchronous PST standups with growth and product, and we know the difference between a YC scoping conversation that needs to ship by Demo Day and a Series A buildout that needs to survive a Sequoia or a16z technical diligence pass. We will tell you up front which mode your project is in and staff accordingly.

Apple App Tracking Transparency and SKAdNetwork reshaped mobile attribution in 2021 and the dust has settled into a clear playbook. We wire ATT prompts only where the IDFA actually drives meaningful measurement, write prompt copy that survives both Apple Reviewer scrutiny and reasonable opt-in rates, configure SKAdNetwork conversion values through AppsFlyer, Adjust, Branch, or Singular against the growth team's modeling priorities, and set up Apple Search Ads attribution properly. For paid social, we wire Meta Aggregated Event Measurement, TikTok SKAN postbacks, and Google Ads SKAN bridges. For deferred deep linking we use Branch or AppsFlyer OneLink. We coordinate with the growth team's MMP contract before kickoff so the attribution model the CMO is actually going to ship against is the one we build to, not a generic default config.

Most custom mobile development qualifies for the US federal Research and Development tax credit under IRC Section 41, and California offers a parallel state R&D credit through FTB Form 3523. Qualified activities generally include novel mobile architecture work, real-time systems engineering, ARKit or Core ML integration, custom camera and computer vision pipelines, novel cross-platform module work, and systematic experimentation, but not routine UI work or off-the-shelf SDK integration. We deliver contemporaneous documentation, time-tracked engineering logs, technical narratives, and failed-hypothesis records aligned with the Section 174 capitalization rules that took effect in 2022 and remain in force. Your CPA or specialty R&D firm files Form 6765 federally and California FTB 3523, and our records support the claim. Final eligibility sits with your tax advisor and the IRS, not with us.