Senior Software Engineer (Fullstack) - Web Platform in San Francisco

Job DescriptionJob Description

Senior Software Engineer (Fullstack) – Web Platform

Location: San Francisco, CA (On-site)
Employment Type: Full-Time
Experience Level: Senior (5+ Years)

About the Role

We’re looking for a Senior Fullstack Software Engineer to help build and scale a high-growth web platform. In this role, you will take ownership of the end-to-end web experience, bringing a successful mobile product to the web while laying the groundwork for future expansion.

You’ll play a key role in shaping architecture, defining engineering standards, and delivering impactful features used by millions of users.

What You’ll Do

• Build and launch a scalable web platform from the ground up
• Develop a web version of an existing high-growth mobile application
• Define best practices for React and modern frontend development
• Own and enhance internal tools and dashboards for data-driven decisions
• Collaborate with backend engineers to design APIs and data models
• Improve performance, scalability, and user experience
• Create polished UI with animations, micro-interactions, and responsive design

✅ Requirements

• 5+ years of experience in fullstack web development
• Strong expertise in React, TypeScript, and JavaScript
• Experience building scalable, production-grade web applications
• Solid understanding of API design and system architecture
• Ability to work in a fast-paced, high-ownership environment
• Strong problem-solving and communication skills

Nice to Have

• Experience with React
• Background in building consumer-facing or high-scale applications
• Passion for UX/UI and performance optimization

Work Environment

• On-site collaboration in a fast-moving, high-impact team
• Opportunity to work on products used by millions of users globally
• High ownership and autonomy with strong cross-functional exposure

Apply Now!

If you're passionate about building scalable products and want to make a real impact, we’d love to hear from you.

Hashtags

#FullstackDeveloper #ReactJobs #TypeScript #SoftwareEngineer #WebDevelopment #TechJobs #HiringNow #SanFranciscoJobs #FrontendDeveloper #BackendDeveloper