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Senior Full-Stack Software Engineer

a4assist • San Francisco Bay Area
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AI Summary

Senior Full-Stack Software Engineer to own the end-to-end web stack for a high-growth consumer technology startup. Establish architecture, standards, and best practices for web and future Android applications. Requires 5+ years of experience with React, TypeScript, and JavaScript in a high-ownership environment.

Key Highlights
Own the end-to-end web stack and establish technical foundation for future web and Android applications
Build and launch the web version of a rapidly growing consumer application within 3-6 months
Competitive base salary of $200,000–$400,000 plus equity in a profitable, fast-growing startup
Key Responsibilities
Build and launch the web version of a rapidly growing consumer application within approximately 3–6 months
Establish the architecture, standards, and best practices for the company’s web platform
Own the full development lifecycle across frontend, backend integrations, testing, deployment, and performance
Define engineering standards for React and potentially contribute to React Native applications
Build and improve internal tools and dashboards that help teams operate efficiently and make data-informed decisions
Partner with backend engineers to design APIs, data models, and scalable system integrations
Create responsive, polished user experiences featuring thoughtful motion and micro-interactions
Identify technical and product problems independently and drive solutions from concept through launch
Help establish the foundation for future web and Android products
Technical Skills Required
React TypeScript JavaScript
Benefits & Perks
Base salary of $200,000–$400,000
Competitive equity
Visa transfer support (H-1B and OPT)
Nice to Have
Experience with React Native or mobile application development
Experience building consumer marketplaces, gaming products, fintech platforms, or transaction-heavy applications
Experience establishing web infrastructure or engineering standards from the ground up
A strong eye for design, animation, motion, and user interaction
Previous experience at a fast-growing startup

Job Description


Senior Full-Stack Software Engineer


📍 San Francisco, CA — On-site, 5 days per week

💰 $200,000–$400,000 base salary + competitive equity

đź’Ľ Full-time

🛂 Open to eligible visa transfers, including H-1B and OPT


About the Opportunity


We’re hiring a Senior Full-Stack Software Engineer to join a fast-growing, profitable consumer technology startup operating at the intersection of technology, entertainment, culture, and real-money experiences.


The company serves millions of users, processes billions in annual transaction volume, generates hundreds of millions in revenue, and is growing more than 10x year over year. Backed by over $65 million from leading venture investors, the team is now expanding one of its fastest-growing mobile products to the web.


In this role, you will own the end-to-end web stack and establish the technical foundation for future web and Android applications. You will work within a small, highly collaborative engineering team where your decisions will directly affect millions of users.


What You’ll Do


Build and launch the web version of a rapidly growing consumer application within approximately 3–6 months

Establish the architecture, standards, and best practices for the company’s web platform

Own the full development lifecycle across frontend, backend integrations, testing, deployment, and performance

Define engineering standards for React and potentially contribute to React Native applications

Build and improve internal tools and dashboards that help teams operate efficiently and make data-informed decisions

Partner with backend engineers to design APIs, data models, and scalable system integrations

Create responsive, polished user experiences featuring thoughtful motion and micro-interactions

Identify technical and product problems independently and drive solutions from concept through launch

Help establish the foundation for future web and Android products


What We’re Looking For


5+ years of professional full-stack web engineering experience

Deep production experience with React, TypeScript, and JavaScript

Demonstrated ability to build and launch sophisticated consumer-facing web applications

Experience owning projects and systems from initial architecture through production

Strong understanding of API design, data models, application performance, and scalable frontend architecture

High standards for user experience, responsive design, and product quality

Ability to move quickly and work effectively in a high-ownership startup environment

Strong communication and cross-functional collaboration skills

Willingness to work from the San Francisco office five days per week


Nice to Have


Experience with React Native or mobile application development

Experience building consumer marketplaces, gaming products, fintech platforms, or transaction-heavy applications

Experience establishing web infrastructure or engineering standards from the ground up

A strong eye for design, animation, motion, and user interaction

Previous experience at a fast-growing startup


Compensation


The base salary range is $200,000–$400,000, depending on experience and qualifications, plus competitive equity.


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