Senior UI Developer – React & AI-Native Experiences

Cogniify, Inc.; San Francisco (CA); Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

Unlimited PTO

Medical/Dental/Vision

Disability & life insurance

Mental health support

ESPP

Team-building experiences

Mentorship opportunities

Management resources

Small teams

Open communication

Entrepreneurial culture

Job summary

Cogniify, Inc. is seeking a Senior UI Developer to build fast, intuitive React interfaces for AI-powered workflows and own frontend architecture across product, design, backend, and AI teams in an early-stage environment.

You will lead the development of React applications, design real-time UIs that stream model outputs and generative content, and take concepts from Figma to production with attention to typography, motion, spacing and micro-interactions.

Qualifications

• Experience designing and shipping production-grade web apps.
• Strong React and frontend architecture knowledge.
• Experience with AI-native product experiences is a plus.

Responsibilities

• Lead the development of React-based frontend applications.
• Own frontend system design, architecture and data synchronization.
• Build real-time UIs connecting to REST APIs and WebSocket streams.
• Translate Figma concepts to production with typography and motion detail.
• Collaborate on multimedia features including audio/video content.
• Implement client-side telemetry and error logging.
• Participate in code reviews, testing and performance audits.
• Stay current with AI UX patterns and frontend performance tricks.

Skills

React development

Frontend architecture

UI/UX design

Figma

RESTful services

WebSocket

Performance optimization

Analytics telemetry

Education

Degree in Computer Science or related field

Tools

Vite

Webpack

ESLint

Amplitude

Datadog

Job description

work Full-time distance Remote

TheRole

Cogniify is hiring a Senior UI Developer to build fast, intuitiveand visually rich interfaces for AI-powered workflows. This role owns frontendarchitecture and works closely with product, design, backend and AI teams in anearly-stage, zero-to-one environment, helping shape the product, codebase anddesign system from the start.

You will lead the development of our React applications, designreal-time UIs that stream model output and generative content, and takeconcepts from Figma to production with close attention to typography, motion,spacing and micro-interactions.

WhatYou Will Do

• Lead the development of React-basedfrontend applications for our products.
• Own frontend system design, includingcomponent architecture, state management, data synchronization and renderingstrategies that scale to multi-session, collaborative use.
• Build responsive, real-time UIs thatconnect to REST APIs, WebSocket streams and AI inference services, includingstreaming model output and generative content.
• Take concepts from Figma to productionwith close attention to typography, motion, spacing and micro-interactions.
• Collaborate on multimedia features,including dynamic visuals, embedded audio and video, and generative content.
• Implement client-side telemetry, userbehavior tracking and error logging.
• Take part in code reviews, testing andperformance audits.
• Keep up with AI UX patterns, frontendperformance techniques and creative coding frameworks.

WhatWe Are Looking For

• 5+ years of experience building andshipping production-grade web applications.
• Degree in Computer Science or a relatedfield, or equivalent experience.
• Experience building AI-native productexperiences, such as streaming responses, agentic workflows or real-timegenerative content.
• Experience with modern build toolssuchas Vite, Webpack and ESLint.
• Design engineering skills, includingFigma fluency and prototyping motion and interaction, with a portfolio thatshows consumer-grade UI craft and strong design instincts.
• Experience with RESTful services,streaming APIs or WebSocket communication.
• Understanding of responsive design,asynchronous data handling and performance optimization.
• Experience with data-instrumented UIs,using analytics and error-logging tools such as Amplitude or Datadog.
• Strong grasp of UX best practices andcomponent-driven architecture, including frontend system design for componentboundaries, data flow, real-time sync and performance budgets.
• Experience building products from zeroto one in a startup or early-stage environment, with little spec or teamsupport.

PreferredExperience

• Experience with video, audio or creativevisualization frameworks such as Three.js, D3, Canvas or WebGL.
• Open-source work, design-engineeringside projects or interactive experiments.

Perksand Benefits of Working With Us

• Unlimited PTO and generous parentalleave.
• Medical, dental and vision coverage.
• Access to disability and life insurance.
• Mental health and wellbeing support.
• Employer Stock Purchase Program (ESPP).
• Yearly team-building experiences.
• Mentorship and sponsorshipopportunities.
• Manager resources and support.
• Small, dynamic teams with opportunitiesto make an impact.
• Open communication with management andcompany leadership.
• An entrepreneurial culture thatencourages initiative and new ideas.

We are an equal opportunity employer.We celebrate diversity and are committed to creating an inclusive environmentfor all employees. All qualified applicants will receive consideration withoutregard to race, color, religion, sex, sexual orientation, gender identity,national origin, disability, veteran status or any other protectedcharacteristic.