Company intelligence
Callstack
Shipping products at AI speed. Building tools for agents. 39M monthly downloads. React Foundation Founding Members.
About Callstack
Callstack is an AI-native engineering company. We build cross-platform products with agent-driven workflows, then help enterprise teams adopt the exact same way of working. Backed by 10+ years of React Native leadership, our work combines framework expertise with the tools and systems needed to ship at AI speed. We do that in four areas: • Engineering: We build complex React and React Native products with AI-native workflows, so teams can ship roadmap work faster, launch across platforms more efficiently, and solve hard engineering problems without trading away quality. • Infrastructure: We build the systems that let faster output become faster shipping, from agentic QA and device automation to CI/CD and observability, so delivery stays reliable as AI speed increases. • Adoption: We turn AI tools into a repeatable way of working by configuring the stack, training engineers, and measuring impact, so teams get more than experimentation and leadership gets a clearer return on AI investment. • Governance: We keep enterprise AI under control at scale with private models, tooling audits, tighter access, and smarter model routing, so teams can move faster without creating security, compliance, or cost problems. We also build specialized tooling for this new era, including Apex, our specialized model for React Native that cuts frontier-model costs, and Agent Device, which gives AI agents control over real iOS and Android apps. And we bring the community into that conversation through Agent Conf, where the future of agent-driven development gets shaped in public. This work builds on more than a decade of React Native leadership: • Core Contributors to React Native and Founding Members of the React Foundation. • 10+ years in the space and 100+ enterprise projects delivered. • Open-source software behind more than 30M monthly downloads. Learn more at callstack.com.
Verified activity
Signals from Callstack
11 published signals
Products & Services
Callstack used an agentic software development lifecycle to deliver a production-ready React and Next.js platform in under one month.
Reported by Callstack
Research & Knowledge
Callstack published a podcast episode featuring Nico Martin from Hugging Face and Mike Grabowski discussing Transformers.js and running AI features in the browser or cloud.
Reported by Callstack
Presence & Recognition
Callstack announced that React Universe On Air featuring Nico Martin from Hugging Face and Mike Grabowski will be held on Sept 7 at 2PM CEST.
Reported by Callstack
Research & Knowledge
Callstack published a field guide comparing engineering leaders and senior practitioners at 12 organizations with 10 years of experience contributing to React Native and working with enterprise teams.
Reported by Callstack
People
Callstack welcomed Margelo as a new member of the team.
Reported by Callstack
Research & Knowledge
Callstack published an article detailing the integration of react-native-brownfield into a .NET MAUI app.
Reported by Callstack
Research & Knowledge
Callstack published Chapter 4 of the book Migration to React Native in the AI Era, which includes a simple way to calculate ROI and check it again at each project milestone.
Reported by Michał Pierzchała
Presence & Recognition
Callstack is hosting a last-minute speaker slot at Agent Conf in Warsaw from September 17-18, 2026.
Reported by Michał Pierzchała
Strategy & Corporate Development
Callstack announced that Margelo, a high-end engineering company behind Nitro Modules, VisionCamera, and react-native-mmkv, is joining Callstack in a transaction valuing Margelo at more than EUR 20 million.
Reported by Callstack
Partnerships
Callstack and Margelo joined forces to pair their Nitro Modules, VisionCamera, and react-native-mmkv with Callstack's decade of enterprise RN delivery
Reported by Piotr Miłkowski
Products & Services
Callstack launched the Super App Showcase, featuring the Host Shell, federated mini apps, and the Shared SDK to make feature teams' releases more concrete.
Reported by Callstack