Full Stack Engineer
Phonely, San Francisco, California
What you will do
- Build and maintain high-performance, responsive web applications using React and Next.js
- Design and implement end-to-end features across frontend and backend systems
- Work closely with backend engineers to integrate APIs, real-time systems, and voice AI workflows
- Own UI/UX quality—craft fast, intuitive, and reliable user experiences
- Manage state effectively across complex applications (server + client state)
- Optimize frontend performance (latency, rendering, caching, edge delivery)
- Build internal tools and dashboards for monitoring, debugging, and controlling AI agents
- Write clean, maintainable, and well-tested code across the stack
- Debug production issues and continuously improve reliability and usability
- Contribute to system design, architecture decisions, and product direction
What you need
- 5+ years of experience building production applications
- Strong experience with React and Next.js