Callstack Information

Callstack combines expert engineering with agentic delivery to build and scale products and improve how teams develop, test, and ship software. Our senior engineers work on new products and features, architecture, complex migrations, performance, and native integrations. They use AI agents and take responsibility for technical decisions and the quality of what ships. We also help your team put agents to work across the software lifecycle. We connect agents with the context of your product and codebase, automated testing, and delivery infrastructure. Your team can understand, adapt, and own these workflows, including the custom agents we build for your engineering work. Our roots are in React and React Native. Contributions to core technology and experience building widely used open-source tools shape how we solve demanding engineering problems. We bring that experience to improving delivery within your existing technology stack. You work with: ➡️ React Native Core Contributors and Founding Members of the React Foundation. ➡️ Creators of agent-device for app automation and Apex, our specialized coding model. ➡️ Engineers backed by experience with 100+ enterprise clients and open-source libraries downloaded 50M+ times every month. Explore our work at callstack.com.