React Native app development company in San Francisco

What San Francisco companies are building

San Francisco Bay Area is shaped by the densest concentration of venture-funded software companies in the world. That mix produces a particular kind of demand: fast v1s for funded teams, AI-native features, and products that must survive technical due diligence in the next raise.

For a cross-platform app specifically, that means the brief usually arrives with real operational constraints attached rather than as a blank sheet — and the firms that do well here are the ones that ask about those constraints in the first call.

• Software & AI — a core buyer segment in San Francisco
• Fintech — a core buyer segment in San Francisco
• Marketplaces — a core buyer segment in San Francisco
• Health tech — a core buyer segment in San Francisco

The local hiring market

your reviewers are engineers, so architecture, test coverage and instrumentation carry as much weight as the demo

Practically, that means most San Francisco organisations run a small internal product group and bring in an outside team for design and engineering capacity. The arrangement works when the outside team operates inside your tooling, your ticket tracker and your working hours — and fails when it operates as a black box that returns a build every six weeks.

What the engagement includes

One product team shipping both platforms in TypeScript, with native modules where the hardware lives.

A complete scope for a cross-platform app looks like this. If a proposal is missing several of these lines, the difference will appear as a change order later.

• TypeScript in strict mode with typed navigation and API contracts
• Shared business logic with platform-specific UI where it matters
• Native modules written by iOS and Android engineers, behind typed interfaces
• EAS or fastlane pipelines producing signed store builds
• A written React Native version upgrade policy
• Over-the-air update strategy for JS-layer fixes

The three problems that decide the outcome

Upgrade discipline decides the lifespan — The difference between a healthy React Native codebase and an expensive rescue is almost entirely whether upgrades happened on schedule. We commit to a cadence in writing.

Dependency hygiene — Every library you add is a maintenance liability. We keep the tree small, audited and pinned, and we own the wrappers around anything critical.

Knowing when to go native — Background sensing, heavy media and deep watch integration belong in native modules. We tell you that at proposal stage rather than discovering it in sprint eight.

Stack and architecture

React Native with the new architecture, TypeScript, React Navigation, TanStack Query for server state, and native modules in Swift and Kotlin.

Ask any San Francisco firm to justify its recommendation against the three problems above rather than against its own staffing convenience. A team that recommends the same stack for every client is telling you about its bench, not about your product.

Budget and timeline for a San Francisco project

A cross-platform v1 for both platforms typically runs $55,000 to $150,000. The saving against two native builds is real but closer to 25–35 percent than 50, because design, QA and backend do not halve.

A realistic schedule is two to three weeks of discovery, three to five weeks establishing design and core flows, then eight to fourteen weeks of build and QA before production launch. Because San Francisco sits in the Pacific time zone, we run demos and working sessions inside your business hours rather than at the edges of them.

• Discovery and product strategy — 2 to 3 weeks
• Design system and core flows — 3 to 5 weeks
• Build and QA — 8 to 14 weeks for a substantial v1
• Launch, monitoring and iteration — ongoing

What to measure after launch

Instrument these before you ship. A cross-platform app without measurement is a guess with a release cycle, and the arguments about what to build next become opinion contests.

• JS and native crash rates tracked separately
• Bundle size and time to interactive
• Shared-code percentage across platforms
• Release cadence and OTA adoption rate
• Upgrade lag behind current React Native version

Compliance, risk and ownership

Store rules limit what can be changed over the air, and abandoned third-party libraries are the most common source of upgrade pain.

Separately, and regardless of who builds it: your organisation should own the repository from the first commit, hold its own Apple, Google and cloud accounts, receive design source files, and have handover terms written into the master agreement. If a firm resists any of those, the technology conversation is irrelevant.

• Repository owned by your organisation from commit one
• Store and cloud accounts in your company's name
• Design source files delivered, not screenshots
• Written exit and handover terms
• A mutual NDA signed before detailed discussion

How to choose between San Francisco shortlist candidates

Shortlist eight, then do the ten-minute check on each: install a shipped app, read the one- and two-star reviews, and look at whether the developer responds. Take four calls. Ask which named engineers will work on your project, when you will first hold a running build, and what broke on their last launch.

Anyone who was actually there answers immediately and specifically. Anyone who was not repeats the case study in different words.

• A live, installable product in your category
• Named senior engineers you can meet before contracting
• A working build in your hands within weeks, then weekly
• A specific answer to each of the three hard problems above
• Full ownership of code, cloud accounts and store listings

Working with WVE Labs from San Francisco

WVE Labs is a digital product company founded in 2015. Strategy, design and engineering sit under one roof, mobile has been at the heart of the studio for more than a decade, and we have delivered for startups, growth companies and established organisations including Sony, Honda, Guardian, Marriott, USC, Maui Jim and California State University. Engagements start at $25,000.

We work with San Francisco Bay Area clients the same way we work everywhere: a small senior team, weekly demos on a live build, named engineers in your repository from sprint one, and a clear line from each release back to the business number you are trying to move.