Frontend UI Software Engineer

Kai; San Jose (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Kai is seeking an experienced UI Developer to join our San Jose team. You will build scalable front-end applications using React and TypeScript, and collaborate with designers to deliver pixel-perfect interfaces across devices.

You will work with GraphQL APIs, contribute to design systems, and partner with backend/DevOps to ensure smooth deployments. Strong TypeScript and React expertise, plus experience with Redux or Apollo, are highly valued.

Qualifications

• 5+ years of professional experience in UI/front-end development.
• Strong proficiency in React and TypeScript.
• Experience with state management libraries (Redux, Apollo, or equivalent).
• Familiarity with Git, CI/CD workflows, and Agile development practices.

Responsibilities

• Develop and maintain scalable front-end applications using React and TypeScript.
• Implement responsive designs that provide seamless experiences across web, tablet, and large screens.
• Collaborate with UX/UI designers to translate design mockups into high-quality, pixel-perfect interfaces.
• Integrate with GraphQL APIs and optimize front-end data fetching for performance and reliability.
• Build and maintain component libraries and design systems to ensure consistency and reusability.
• Work with backend and DevOps teams to ensure smooth deployment, testing, and scalability of applications.
• Contribute to code reviews, best practices, and technical documentation.

Skills

React

TypeScript

UI/Frontend

Performance optimization

Debugging

Agile

Tools

Redux

Apollo

Git

CI/CD

Job description

Overview

Kai is the AI company rebuilding cybersecurity for the machine-speed era. Founded by second-time founders and trusted by Fortune 500 enterprises, Kai is building a future where security has no categories, no silos, and no human-speed bottlenecks. The Kai Agentic AI Platform replaces fragmented, human-limited workflows with agentic AI systems that continuously contextualize, assess, reason, and execute security work at machine speed - making human defenders, superhuman.

Why Join Kai

• Well-funded: With $125M raised, we have the capital, runway, and resolve to rebuild cybersecurity from first principles.


• Proven: We\'ve earned the trust of Fortune 500 and Global 1000 companies, and we\'re just getting started. Their confidence in Kai reflects what we\'ve built: an AI-powered cybersecurity platform that performs at the scale and speed the enterprise demands.


• Experienced founders: Our founding team consists of second-time entrepreneurs, each with over 20 years of experience in the cybersecurity industry. Their proven expertise and vision drive our ambitious goals.


• World-class leadership team: Our Heads of AI, Engineering, and Product bring extensive experience from some of the world’s most influential companies, ensuring top-tier mentorship, direction, and vision.


• Frontier AI Applied Research Team: Our researchers operate at the leading edge of agentic AI systems, translating breakthrough capabilities into real-world cybersecurity applications.


• Generous compensation: We offer highly competitive salaries, equity options, and a supportive work environment. Your contributions will be valued and rewarded as we grow together.

Why This Role Matters

This role serves as the bridge between complex application logic and the people who interact with it every day. By transforming technical requirements into fast, responsive, and intuitive interfaces, the UI Developer ensures that users experience clarity, speed, and reliability. In a world where digital experiences shape trust and adoption, thoughtful UI development directly drives product success and customer confidence.

What You\'ll Do

• Develop and maintain scalable front-end applications using React and TypeScript


• Implement responsive designs that provide seamless experiences across web, tablet, and large screens


• Collaborate with UX/UI designers to translate design mockups into high-quality, pixel-perfect interfaces


• Integrate with GraphQL APIs and optimize front-end data fetching for performance and reliability


• Build and maintain component libraries and design systems to ensure consistency and reusability


• Work with backend and DevOps teams to ensure smooth deployment, testing, and scalability of applications


• Contribute to code reviews, best practices, and technical documentation

What You\'ll Bring

• 5+ years of professional experience in UI/front-end development, 7+ years preferred


• Strong proficiency in React and TypeScript


• Demonstrated experience building responsive and adaptive UIs


• Experience with state management libraries (Redux, Apollo, or equivalent)


• Strong debugging, performance optimization, and problem-solving skills


• Familiarity with Git, CI/CD workflows, and Agile development practices


• Bonus: Strong eye for design and usability with experience collaborating on tools like Figma


• Bonus: Exposure to cloud platforms (AWS, Azure, or GCP) and DevOps pipelines