Media kit Download logo

Expert Engineering

Build and scale React & React Native apps.

Architecture & Performance

React Native Performance Optimization

React Native Brownfield Integration

Migrations & Upgrades

Migration to React Native

React Native Upgrades

Enterprise Infrastructure

Release Automation

Release Monitoring & Observability

Feature Development

React Native Development

React Development

End-to-End Product Development

Super App Development

Mobile App Development

AI Developer Training

React Native Trainings

Agentic Delivery

Turn AI into better software delivery.

AI SDLC Advisory

AI-Driven QA & Testing

AI-Native Test Automation

AI-Generated Code Validation

Code Review Agents

Custom & Private Models

On-Premise LLM Deployment

LLM Fine-Tuning

React Native core contributors

Open source since 2016

Meet the Callstack experts

Work with us at Callstack

I joined to build robust React Native apps used by millions, and found myself surrounded by talented, friendly teammates who turn any challenge into a shared adventure.

Aleksandra Desmurs-Linczewska

Software Engineer @ Callstack

What I love most about Callstack is the constant opportunity to grow.

Thiago Brezinski

Software Developer @ Callstack

If you're focused on development, Callstack will support and challenge you.

Monika Stotko

Finance & Administration Manager @ Callstack

Technical deep-dives and expert insights

Interviews with industry leaders

Monthly React, React Native, and AI updates

Talks, workshops, and community events

Practical guides to React, React Native, and AI

Webinars & Live Streams

Live sessions on React, React Native, and AI

Videos that inspire what you build next

Check all topics

Explore all our engineering insights

One model across all React Native work.

A cost-effective, general-purpose model for everyday agent work. Frontier-level where React runs: React Native on mobile, Next.js on the web.

Book consultation

Insights

AI

Artificial intelligence is changing how we build and maintain React and React Native apps—from code generation to testing. Find out how AI-powered tools improve your development process and help create smarter cross-platform experiences.

ALLArticlePodcastEventWebinarCase StudyTutorialTalkConferenceMeetupLive Stream

Podcast Cover

App Store Connect CLI, Agents, and Mobile Release Automation With Rudrank Riyam

Rudrank Riyam joins React Universe On Air to talk about App Store Connect CLI, agent workflows, and automating mobile release work.

Events Cover

Training AI Is More Than Feeding It the Internet

A Live Stream with Kewin Wereszczyński and Piotr Miłkowski on AI training, datasets, tokenization, alignment, and why models infer patterns rather than understand meaning.

Events Cover

Giving AI Agents Hands: Mobile Feedback Loops with Agent Device

Mike Grabowski will speak at React Summit 2026 about Agent Device, Callstack’s agent-native automation layer for giving AI coding agents a practical feedback loop across mobile, TV, and desktop apps.

Events Cover

Testing AI Agent Skills Reliably with SkillGym

Szymon Chmal will speak at meet.js Gdańsk TypeScript Meetup #20 about SkillGym, a framework for testing AI agent skills across real runners and workflows.

Article Cover

5 Lessons From Vibe Coding Before You Ship with AI

Vibe coding gets apps moving fast, but it can hide bugs, cost, and complexity. Learn five practical ways to use AI agents without losing control of your codebase.

Article Cover

On-device AI After WWDC 2026: What's New?

Apple expanded on-device AI with image input, a stronger local model, Private Cloud Compute, and Core AI. See what it means for React Native teams.

Article Cover

Optimizing Self-Hosted Gemma for Production Inference

How we optimized self-hosted Gemma 4 31B from baseline serving to 2.48x higher output-token throughput in production inference.

Events Cover

Callstack x Expo AI Meetup

Join Callstack and Expo in San Francisco for practical talks on AI-native mobile development, Expo Agent, Cloud Agents and autonomous mobile QA.

Events Cover

Redraw and the Future of 2D Graphics on WebGPU

Join Callstack engineers Szymon Chmal and Kewin Wereszczyński on May 21 at 5 PM to explore Redraw, a new 2D graphics library for WebGPU.

Article Cover

Introducing Apex: A Fast, Specialized Model for React Native

Apex is our new coding model designed for React Native. It achieves frontier coding results for mobile workflows at a fraction of the cost.

Article Cover

Agencies or Swarms? What Small Model Cooperation Means for AI Engineering

A hands-on look at agentic swarms, distributed inference, and what small-model benchmarks suggest about future AI infrastructure.

Events Cover

Testing AI Agent Skills Reliably With Skill Gym

Learn how Skill Gym helps test, validate, and improve AI agent skills with repeatable workflows, assertions, and model-aware feedback.

...

...

Hire us

Integrating AI into your React Native workflow?

We help teams leverage AI to accelerate development and deliver smarter user experiences.

2×Estimated AI-assisted delivery speedupJetBrains
25Working days from kickoff to mergeJetBrains
1Plugin across three frameworksJetBrains
10min from code change to mini-app releaseTeamworks
multi-dailystaging deployments instead of weekly releasesTeamworks
7mini-apps supported in one modular mobile platformTeamworks
2CI/CD lanes for mini-app and host-app distributionTeamworks
2xgrowth in mobile user base during the migration periodAutoZone
4.2 -> 4.7app rating increase after migrating to React NativeAutoZone
0missed releases during the transition to React NativeAutoZone
33%fewer re-renders across most featuresQuestrade
18%faster time-to-interactiveQuestrade
-28%CPU usage in critical trading flowsQuestrade
78%bundle size reduction (from 50 MB to 11 MB)Dream11
30%faster component mount time after render optimizationDream11
60%faster initial load time enabled by switching to HermesDream11
5xfaster message sending timeExpensify
4.5xfaster search screen loading timeExpensify
#1SEO rank, recovering from 3-9AutoZone
260kBless in blocking JS payloadAutoZone
2–5xfaster feedback loopAutoZone
2.8xincrease in knowledge over 8 weeks (25% → 71% assessment scores)Hello Fresh
15developers trained across web and native backgroundsHello Fresh
86%of devs self-rated their knowledge as 3/5 or higher after training (up from 0%)Hello Fresh
130%increase in users post-upgrade7cups
63%adoption rate; majority of attendees registered in the appReact Universe App
67%of attendees connected through QR badge sharingReact Universe App
45%created personalized badges to showcase identity and goalsReact Universe App
49%of attendees onboarded before day one, arriving ready to networkReact Universe App

Talk to our team

We’ll connect you with the right expert within 24 hours.

Talk to our team

By submitting, you agree to be contacted about your request.
Learn more in our Privacy Policy.

We don’t follow best practices.We set them.

Media kit Download logo

Get React, React Native, and AI updates in your inbox

By subscribing, you agree to receive marketing emails. You can unsubscribe anytime. Learn more in our Privacy Policy.*

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Services

Expert Engineering Agentic Delivery QA Agent AI-Assisted Migrations React Native Development Case Studies

Technology

Technology Open Source Agent Conf

Callstack

About Us Careers Hire Us Media Kit Privacy Policy Cookie Policy ISO 27001 Whistleblowing

Insights

Articles Podcast Newsletter Events Ebooks Webinars & Live Streams Tutorials Enterprise Report

2026 Callstack. All rights reserved. Callstack.io Sp. z o.o. seated in Wrocław, Poland, at Prosta 36, 53-508 Wrocław, entered in the Register of Entrepreneurs of the National Court Register, kept by the District Court of Wrocław-Fabryczna in Wrocław, VI Commercial Division of the National Court Register under the number 0000606530, with share capital of PLN 100,000.00, with tax identification number (NIP) PL8992785616, and statistical number (REGON) 363921820.