Mobile App Development in Miami, FL
Miami is one of the most interesting mobile markets in the country — bilingual products, multi-currency billing, LATAM-facing fintechs, and a hospitality sector from Brickell through South Beach that runs on a mess of vertical SaaS. Off-the-shelf mobile templates get the language wrong, the currency wrong, or the payments-routing wrong, and the workaround usually costs more than building the right thing.
The problem with off-the-shelf mobile in Miami
Most mobile shops bolt Spanish on at the end. The language switches mid-flow, the currency formatting breaks, and the payment routing assumes a US-only buyer. Miami mobile demands i18n, multi-currency, and an actual understanding of LATAM payment behavior — none of which a generic mobile agency builds in.
A custom mobile build puts the data model, the UI, and the platform layer around how you actually operate. No vendor SDK tax. No per-seat ratchet. For Miami operators specifically, that means mobile shaped for LATAM-facing bilingual multi-currency mobile — not a generic template.
What we ship for Miami companies
Bilingual ES/EN UI from day one
i18n is baked into our React Native and native builds — your user in Doral and your user in São Paulo see the same app in their language.
Multi-currency Stripe in-app
USD, BRL, MXN, COP, ARS handled correctly inside the mobile checkout — including edge cases around presentment vs settlement currency that off-the-shelf templates fumble.
LATAM payment routing
Stripe by default, with awareness of where local processors (PIX, OXXO, MercadoPago) beat Stripe on conversion.
Hospitality + booking mobile
Hotel, restaurant, and event-group records with deposit, deposit-forfeit, and folio handling that Mews and Cloudbeds do not quite get right.
Tech stack
Hosted on Vercel, AWS, or your own infrastructure. PostgreSQL is the source of truth; the mobile client defers to it.
Reference builds
Miami-relevant reference builds in our portfolio span operations platforms (J5 Sales OS for sales operations, UEhub for education workflows) and bilingual-friendly content-driven mobile builds (ProtectWithBri, Aaron Coleman Music). Same architecture pattern: React Native or native client, PostgreSQL source of truth, Stripe-driven entitlement, role-scoped access, i18n by default. Production-grade from day one.
Reference work: J5 Sales OS, Northcrest Fence, and Bridgepointe Painting.
How we work remote from Georgia
QUANT LAB USA is founder-led from Macon, Georgia. William Beltz runs every engagement from kickoff through handoff — no agency middleman, no offshore handoff at the framework boundary. Discovery happens over a structured video session; weekly demos run on the same cadence; staging is live from week two so you can put a real mobile build in your team's hands before final delivery.
For Miami clients, that means full Eastern-time overlap, fixed-scope contracting against milestones, and on-site work when the engagement warrants it. Book a scope call to walk through your workflow and get a written estimate.
Pricing for Miami mobile builds
Miami mobile engagements typically scope between $40,000 and $110,000 for a production-grade bilingual MVP. Hospitality and booking apps land mid-range; fintech and multi-currency Stripe builds land at the upper end.
We quote fixed-fee scope after a 30-minute discovery call. Engagements include the mobile client, the backend, the API surface, Stripe and payments wiring as scoped, and App Store and Play Console submission. Source-code handoff is included at delivery — no platform fees, no per-seat charges, no vendor lock-in. See our parent mobile service page for the broader engagement model.
What you get
- Full source code repository (yours, no lock-in)
- iOS and Android builds submitted under your developer accounts
- Backend API + PostgreSQL database
- Stripe / Apple Pay / Google Pay wiring as scoped
- Push notification setup (APNs + FCM)
- 30-day post-launch support included
Miami mobile FAQ
Can you ship a Spanish-language mobile UI?
Yes — i18n is standard in our React Native and native builds, with ES/EN switchable per user and date/currency/timezone formatting handled correctly.
Do you handle LATAM payments correctly inside the app?
Stripe is our default and we model multi-currency correctly. We also know the limitations and will tell you straight when local processors (PIX, OXXO) beat Stripe on a given market.
Are you available for on-site work in Miami?
Yes, for engagements that warrant travel. Most discovery runs remotely with full ET overlap from our Georgia HQ.
Will the app survive an institutional buyer's security review?
Yes. We document architecture, ship audit trails by default, and produce pen test reports on request.
Do you support Apple Pay and Google Pay?
Yes — both, with proper Stripe integration.
Who owns the source code?
You do. Full repository handoff at delivery.
Related services
SaaS Platform Development
Full-stack SaaS builds — same data model behind your mobile app.
Custom CRM Development
Pair your mobile app with a CRM your team will actually use.
Stripe Integration
Apple Pay, Google Pay, Stripe Connect inside your mobile client.
AI Integration
On-device and server AI features wired into the mobile app.
DevOps + CI/CD
Mobile CI/CD, EAS, Fastlane, and release management.
Nearby cities we serve
Ship a real mobile app in Miami.
Call William Beltz directly at (770) 652-1282 or book a 20-minute scope call to walk through your mobile build. Founder-led from quote to handoff.