Full-Stack Software Engineer Jobs in USA 2026

Enjoy unifying decades-old legacy systems with modern infrastructure? A fast-growing startup seeks Full-Stack Software Engineers in San Francisco. Visa sponsorship covers H1B, TN, and other visa categories. If high-ownership engineering excites you, this role offers genuine impact.

About the Role

This role is roughly 80–90% backend-focused engineering work. You will own features end-to-end without a traditional manager layer. Additionally, you will build APIs connecting legacy systems to modern software. The team ships daily based directly on real customer feedback.

About the Hiring Firm

The company currently operates with a flat, small engineering team structure. It focuses on syncing financial data across fragmented legacy software systems. The team connects construction ERPs to modern software solutions daily.

Job Duties

• Build and maintain a unified API layer connecting legacy systems
• Ship backend systems for ERP Sync and Vendor Management
• Solve real-time data sync challenges using WebSocket implementations
• Build scalable testing frameworks across over 1,000 endpoints
• Engage directly with customers and ship features from feedback
• Handle systems processing millions of API requests daily

Job Requirements

• 1–5 years of backend or full-stack engineering experience
• Strong new graduates with relevant internship experience also considered
• CS degree from a strong engineering program required
• Familiarity with cloud infrastructure, with AWS preferred
• Self-motivated, high-ownership mindset suited to fast-paced teams
• Willingness to work in-person five days weekly in San Francisco
• Startup or founding engineering experience is a plus
• Strong academic or competitive extracurricular background is valued

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Conclusion

This role suits engineers ready to modernise infrastructure built decades ago. With genuine ownership and direct customer contact, the impact stays visible. For ambitious backend engineers seeking rapid growth, this opportunity delivers real depth.

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