01 · React Native development
Production apps built on React Native.
Production apps built on React Native with native modules where performance demands it.
Cross-platform · React Native · Flutter
One codebase. iOS, Android, and web.
Build once, ship everywhere. We use React Native and Flutter to deliver native-quality apps on iOS, Android, and web from a single shared codebase — cutting build time and ongoing maintenance cost without sacrificing performance.
Capabilities
Everything one team needs to ship across platforms.
From framework selection through App Store submission. The same senior staff that scopes the engagement builds it, tests it, and ships it to all three platforms.
02 · Flutter development
Dart-based apps with pixel-perfect UI.
Dart-based apps for teams that need pixel-perfect UI consistency across platforms.
03 · Shared codebase architecture
One team ships to all platforms.
Code structure, state management, and CI/CD set up so one team ships to all platforms.
04 · Platform-specific modules
Native iOS/Android where the shared layer falls short.
Native iOS/Android code bridged in where the shared layer falls short.
05 · App Store deployment
End-to-end release management.
End-to-end submission, signing, and release management for both App Store and Google Play.
06 · Performance optimization
Smooth 60fps on mid-range Android.
Profiling and tuning for smooth 60fps on mid-range Android devices.
How we work
Four phases. Same team across all four.
The phases that apply to every engagement, not just one codebase. The team that scopes does the building, and the operating.
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Phase 01 · 2–4 weeks
Discovery and scope.
Stakeholder interviews, technical review of existing systems, risk register, written scope with milestones and exit criteria.
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Phase 02 · 3–12 months
Build and iterate.
Two-week sprints with working demos. Senior leads on every sprint review. Code reviewed, accessibility checked.
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Phase 03 · 2–6 weeks
Cutover and stabilization.
Parallel run with rollback path. On-call coverage during the launch window. Stabilization continues until incident rate trends to zero.
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Phase 04 · ongoing
Operate and evolve.
Multi-year retainer with the same team that built the product. Monthly check-ins, quarterly business reviews.
Read the full engagement model on the How We Work page.
Industries we serve
Cross-platform apps across 15 verticals.
Six core verticals where OST has the deepest engagement experience. Plus nine adjacent industries served on selective engagements.
01
Education
K-12 charter networks, higher education, public sector portals.
02
Nonprofit & Civic
Donor-cycle nonprofits, advocacy organizations, civic platforms.
03
Healthcare & Wellness
HIPAA-aware platforms, medical directories, telemedicine adjacency.
04
Real Estate Technology
Multi-tenant SaaS, brokerage tools, self-storage operators.
05
E-commerce & Marketplaces
OpenCart specialists, custom commerce, $10B+ in transactions processed.
06
Manufacturing & B2B
Industrial platforms, B2B safety-tech, embedded engineering teams.
Also serves on selective engagements
Frequently asked questions
Common questions on cross-platform engagements.
React Native or Flutter — which should we use?
React Native when your team already knows JavaScript and you need strong ecosystem support. Flutter when you need strict pixel-level UI consistency across platforms and are comfortable with Dart. We help you decide in discovery based on your existing stack and team.
When does cross-platform make sense over native?
When you need feature parity on iOS and Android and do not need deep platform-specific behaviors. Cross-platform cuts build time and maintenance cost significantly when the use case fits. We tell you honestly when it does not.
What does a cross-platform engagement cost?
Pilot scope starts around $40K. Full production scope (three platforms, custom integrations) lands $80K to $200K. Use our cost calculator for a defensible bracket at our blended rate.
Can you add native modules where the shared layer does not cover it?
Yes. Native iOS and Android code bridged in is standard practice. We scope which capabilities need native bridges during discovery and account for them in timeline and cost.
Do you handle App Store and Google Play submission?
Yes. Submission management, store-listing copy, asset preparation, and policy-compliance review on both stores. We sit through the rejections and resubmissions so you do not have to.
Ready to build?
Pick a path forward.
Multiple ways to start: schedule a discovery call, run our cost calculator for a budget bracket, or use the contact form for a written response.