Senior Frontend Developer

About Us

CozmoX AI is building the operating system for voice-native AI employees—autonomous agents that handle sales, support, collections, and more. Backed by Y Combinator and top-tier global investors, the company is scaling rapidly across markets.

About the Role

We're looking for a skilled Frontend Developer with 4–6 years of experience to join our fast-paced team at CozmoX. You'll play a key role in building seamless, scalable, and high-performance user interfaces for our AI voice employee platform. This role is perfect for someone who thrives on solving complex problems, collaborating across teams, and crafting intuitive experiences using the latest front-end technologies.

Key Responsibilities

• Contribute to our monorepo frontend architecture, working on core user-facing experiences across the platform.
• Build scalable and reusable UI components using React, Next.js, Tailwind CSS, and modern JavaScript (ES6+).
• Collaborate with cross-functional teams including Product, Design, Backend, and Data to shape feature direction.
• Own frontend modules from design to delivery, ensuring performance, accessibility, and responsiveness.
• Implement Module Federation for micro-frontend architecture and scaleable deployments.
• Drive development best practices around code quality, testing, documentation, and maintainability.
• Apply data-driven development, building instrumentation for A/B experiments and gathering insights to inform product decisions.
• Translate business and product requirements into robust, maintainable frontend solutions.
• Participate in sprint planning, technical design reviews, and regular code reviews.
• Stay updated with frontend ecosystem trends and advocate for modern solutions within the team.

Requirements

• 4–6 years of professional experience in frontend development.
• Strong proficiency in React, JavaScript (ES6+), HTML5, and CSS3.
• Experience with Tailwind CSS, Next.js, and frontend build tools (Webpack, Vite, etc.).
• Exposure to Module Federation and Monorepo tools like Nx or Turborepo.
• Solid understanding of frontend architecture, UI performance optimizations, and accessibility.
• Familiarity with integrating RESTful and GraphQL APIs.
• Demonstrated experience translating design mockups into pixel-perfect web interfaces.
• Ability to collaborate with backend, product, and design teams in an agile environment.
• Experience with experimentation frameworks, instrumentation, and data-driven product iteration.
• Strong communication and problem-solving skills.
• Bonus: Exposure to TypeScript, Framer Motion, or component libraries like Storybook.

Why Join Us

• Work with cutting-edge technologies in a collaborative and innovative team.
• High ownership, visibility, and impact on product development.
• Opportunity to work on scalable systems from the ground up.