Build AI-powered apps that ship across every platform
We deliver end-to-end generative AI features across iOS, Android, and Web. One team covers UX, integration, observability, and release.
Why is shipping AI harder than building a demo?
Demos are easy. Production is hard. You need error handling, latency control, structured outputs, and observability. You need cost controls, safety guardrails, and a release process that doesn’t break the app.
Shipping is harder than prompting
Production AI needs predictable behavior: error handling, timeouts, retries, and structured outputs that your app can safely rely on.
Shipping is harder than prompting
Production AI needs predictable behavior: error handling, timeouts, retries, and structured outputs that your app can safely rely on.
Quality must be measurable
Without tracing and metrics, it’s impossible to improve answer quality or control spend as usage grows.
Quality must be measurable
Without tracing and metrics, it’s impossible to improve answer quality or control spend as usage grows.
Security is non-negotiable
AI features must respect your data rules, permissions, and safety constraints from the first release.
Security is non-negotiable
AI features must respect your data rules, permissions, and safety constraints from the first release.
A production-ready AI feature, not just a demo
We help engineering teams maximize shared code across platforms with React and React Native. The result is faster delivery and improved consistency across your product ecosystem.
Cross-platform architecture
Codebase that supports reuse across web, mobile, desktop, and TV-without duplicating code per platform.
Provider and deployment strategy
A clear setup for managed LLMs, private deployments, or hybrid routing, chosen based on latency, privacy, cost, and operational constraints.
Observability from day one
Tracing, cost monitoring, and quality signals built in from the start, so you can debug issues quickly and improve outputs release after release.
Safety and policy controls
Controls aligned to your product’s risk profile, including permission-aware behavior and safeguards around sensitive actions.
Offline capabilities and fallbacks
Graceful degradation when connectivity drops, with on-device options or cached behavior that keeps key flows usable instead of failing.
AI-native user experience
A UI that fits your product and workflows, designed around structured interactions and outcomes, not a generic chat screen.
Make generative AI feel native on mobile
Vercel’s v0 iOS app shows how generative AI experiences can translate to mobile products. In the episode, the team shares how AI-driven workflows, fast iteration, and thoughtful technical decisions helped make AI interactions feel responsive and natural when built with React Native.
Build AI-powered apps that ship across every platform
Build end-to-end AI features
We build end-to-end generative AI apps: from design and prototype to production delivery across multiple platforms. One team covers UX, integration, and deployment across all platforms.
Integrate managed or private LLMs
We integrate with AWS Bedrock, Microsoft Foundry, Vertex AI, or deploy self-hosted models inside your VPC for maximum privacy. Enterprise-grade security, compliance, and predictable cost.
Set up evaluation and observability
We set up automated eval pipelines for correctness, as well as cost monitoring and quality metrics. Keep your app accurate and trustworthy as models evolve.
Tune models for your domain
We improve domain performance using fine-tuning or the most appropriate adaptation technique for your use case, so outputs stay accurate and consistent in real workflows.
Why leading companies work with Callstack
Meta Official Partners
We are official Meta partner for React Native, co-organizers of React Conf and hosts of React Universe Conf.
Working at scale
We know how to make React Native work at enterprise scale, both technically and organizationally.
React Native Core Contributors
We don’t just use React Native to build cross-platform apps, we help shape it for millions of developers.
Team at scale
We’re a team of 200+ engineers ready to start fast and scale with your needs.
Enterprise-friendly
We hold ISO certifications and follow strict security standards to make onboarding smooth and compliant.
Wide range of services
As a partner for your full application lifecycle, we offer a full range of services around React and React Native.
FAQs
Shipping generative AI in production raises questions about providers, cost, and reliability. Here are answers to the ones we hear most.
We integrate with AWS Bedrock, Microsoft Foundry, Vertex AI, and self-hosted options. We help you choose based on your constraints.
Yes. We can deploy models inside your VPC or private cloud for maximum control over data and compliance.
We set up observability that tracks token usage, latency, and cost per feature, so you can optimize spend over time.
We implement structured outputs, validation, retries, and fallback logic to handle failures gracefully in production.
We add guardrails for content filtering, data boundaries, and policy enforcement aligned to your product context.
Yes. We deliver cross-platform, with one team covering UX, integration, and deployment across all surfaces.
We set up automated evaluation pipelines that test correctness, grounding, and safety on every release.
We’ve helped dozens of teams go cross-platform without rewriting everything. Let's see how we can help you.
