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Senior Fullstack Software Engineer

A4Assist
Posted 3 hours ago
Visa sponsorship
United States
$200K–$400KEngineering & Development
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🚀 Senior Fullstack Software Engineer | San Francisco, CA | $200K–$400K + Equity

We’re hiring a Senior Fullstack Software Engineer to help build the web platform for a fast-growing consumer technology company in San Francisco.


This is a high-ownership, 0→1 opportunity. You’ll establish the web platform, set React/TypeScript standards, and bring an existing consumer mobile product to the web.


What you’ll do

• Build and launch a consumer web product from the ground up

• Own the end-to-end web stack and frontend architecture

• Establish React and TypeScript standards and best practices

• Build polished, responsive interfaces with thoughtful motion and micro-interactions

• Translate Figma designs into pixel-perfect production experiences

• Own internal tools and dashboards

• Partner with backend engineers on APIs, data models, and performance

• Help establish the foundation for future web and Android experiences

• Work autonomously in a fast-moving, high-agency startup environment


What we’re looking for

• 5+ years of fullstack web engineering experience

• Deep expertise in React, TypeScript, and modern JavaScript

• Proven experience shipping a 0→1 consumer web product at a startup

• Experience owning frontend architecture/platform standards

• Strong product sense and exceptional attention to UI/UX details

• Experience with animations, motion, responsive design, and pixel-perfect Figma implementation

• Comfortable making decisions and shipping quickly with limited direction

• Strong collaboration with backend engineers on API design and data models


Bonus

• Consumer gaming experience

• Payments or real-money product experience

• Real-time application experience

React Native experience


🎯 This role is especially suited for founders, founding engineers, early startup hires, or engineers who have taken a consumer product from idea → launch → scale.

Compensation: $200K–$400K + competitive equity

Location: San Francisco, CA

Work arrangement: On-site, 5 days/week

Visa: Open to visa transfers, including OPT/H-1B transfers


If you’ve built and shipped a consumer product from 0→1 and want significant ownership over what comes next, we’d love to hear from you.

📩 Apply with your resume and a brief description of the consumer product you personally helped build and launch.

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