Senior Frontend Engineer

Infinityy; New York (NY, MA); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Infinityy is seeking a senior front-end engineer to own the React/TypeScript SPA, immersive viewer, and agent dashboard as we move to mobile-first delivery. You’ll ensure fast, polished experiences that scale with design specs and contractor handoff.

You’ll set front-end standards, optimize performance, manage global state with Zustand or Redux Toolkit, integrate with C#/.NET REST APIs, and regularly use AI coding tools to move faster without sacrificing quality.

Qualifications

• 5+ years of professional front-end engineering, with 3+ in production React and TypeScript.
• Shipped mobile-responsive, performance-sensitive SPAs used by real customers.
• Experience with Zustand, Redux Toolkit or similar, plus modern build tools (Vite, Webpack, Turbopack).
• Strong grasp of component design, async data flows and web performance profiling.
• Real-world use of AI coding tools as part of your daily workflow.
• Comfort owning a codebase you didn't write and improving it while shipping.

Responsibilities

• Own the React and TypeScript single-page app, including the immersive and traditional viewers and the agent dashboard.
• Lead the shift to mobile-first: responsive layouts, touch interactions and performance on mid-range phones.
• Build and maintain flows that combine 3D/360 tours, video calls, maps, Street View, chat and AI guide.
• Take over viewer and mobile code from contractors, documenting and paying down debt as you go.
• Manage global state with Zustand or Redux Toolkit and integrate with our C#/.NET REST APIs.
• Build signup, onboarding and upgrade flows that return users to what they were doing.
• Work from design specs in Figma with our product designer; push back when a flow isn't fully specified.
• Set front-end standards (components, accessibility, performance budgets) and review others' code.
• Use AI coding tools daily to move faster without lowering quality.

Skills

React

TypeScript

Frontend engineering

Web performance profiling

AI coding tools

Codebase ownership

Education

Bachelor's degree in Computer Science

Tools

Zustand

Redux Toolkit

Vite

Webpack

Turbopack

Git

Job description

You'll own Infinityy's front end after launch: the immersive viewer buyers tour in, the agent dashboard, and our move to mobile-first. Our React app weaves together 3D and 360 tours, live video, maps, Street View and an AI guide in one flow. You'll keep it fast and polished as we bring this work in-house.

What you'll do

• Own the React and TypeScript single-page app, including the immersive and traditional viewers and the agent dashboard
• Lead the shift to mobile-first: responsive layouts, touch interactions and performance on mid-range phones
• Build and maintain flows that combine 3D/360 tours, video calls, maps, Street View, chat and Fin, our AI guide
• Take over viewer and mobile code from contractors, documenting and paying down debt as you go
• Manage global state with Zustand or Redux Toolkit and integrate with our C#/.NET REST APIs
• Build signup, onboarding and upgrade flows that return users to what they were doing
• Work from design specs in Figma with our product designer; push back when a flow isn't fully specified
• Set front-end standards (components, accessibility, performance budgets) and review others' code
• Use AI coding tools (Claude Code, Cursor, Copilot) daily to move faster without lowering quality

What you'll bring

• 5+ years of professional front-end engineering, with 3+ in production React and TypeScript
• Shipped mobile-responsive, performance-sensitive SPAs used by real customers
• Experience with Zustand, Redux Toolkit or similar, plus modern build tools (Vite, Webpack, Turbopack)
• Strong grasp of component design, async data flows and web performance profiling
• Real-world use of AI coding tools as part of your daily workflow
• Comfort owning a codebase you didn't write and improving it while shipping

Nice to have

• WebGL/WebGPU, Three.js or 360 viewer experience
• Mapping (Mapbox, Google Maps) and video (WebRTC, Twilio, Daily) integrations
• React Native or mobile web experience
• Next.js, design systems, or accessibility (WCAG 2.1 AA) work
• Proptech or consumer marketplace experience

First 90 days

• 30: own the viewer codebase; contractor handoff complete
• 60: mobile-first viewer improvements shipped; performance budget set and tracked
• 90: you're the go-to reviewer for all front-end work

About Infinityy

Infinityy is the decision-making layer for places and spaces, helping people move from initial interest to a confident decision with the information, context and human connection they need, when they need it. Its AI-powered platform brings collaborative property experiences, real-time answers, neighborhood intelligence and direct access to real estate professionals into one connected experience. The platform translates into 12 languages, while its AI assistant answers questions in more than 70.

An early-stage startup, Infinityy is backed by Second Century Ventures, the strategic investment arm of the National Association of REALTORS®, and was selected for its 2024 REACH Commercial and 2025 REACH Residential programs.

Equal Opportunity Employer

Infinityy is an equal opportunity employer. We welcome applicants of all backgrounds and do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, genetic information, veteran status, or any other characteristic protected by law.

Infinityy offers a variety of benefits to its employees, with details shared during the interview process.

Will you now, or in the future, require sponsorship for employment visa status (e.g. H-1B visa status)? (Required)

Are you legally authorized to work in the United States? (Required)

Are you located in one of these primary Infinityy hubs: California, Massachusetts, or New York? (Required)