Sr Founding Full Stack SWE in San Francisco, California at Syndesus

Senior Founding Full-Stack Engineer
About the CompanyOur client is a fast-growing Y Combinator-backed Voice AI startup transforming sales, support, and customer engagement. With $5M in seed funding and approaching $30M ARR already, achieved with just 20 people, they're building the standard for voice automation at scale.
The RoleAs a Founding Senior Full-Stack Engineer, you'll build the core platform powering millions of AI-driven conversations. Working with React, TypeScript, and Node.js, you'll create scalable systems and intuitive interfaces that enable seamless customer experiences.
Key Responsibilities

• Develop core features including prompt orchestration, dashboards, analytics, and telephony integrations
• Build full-stack systems from polished UIs to robust APIs and DevOps workflows
• Own projects end-to-end from architecture to production deployment
• Create intuitive interfaces enabling rapid customer activation
• Support customer onboarding and translate feedback into product improvements

Requirements

• 2+ years full-stack experience with React, TypeScript, Node.js, or Python
• CS/CE degree or equivalent practical experience
• Ownership mindset with ability to solve problems independently
• Thrives in fast-paced, dynamic environments
• Strong communication and collaboration skills

Compensation & Benefits

• Salary: $200K - $280k USD
• Equity: 0.25% - 0.45%
• Schedule: Full-time, 70 hrs/week (50 onsite + 20 remote, flexible hours)
• Location: Redwood City, CA
• 100% medical, dental, vision coverage
• Unlimited meals and snacks
• Gym and commute reimbursement
• Visa sponsorship available (H1B, TN, L-1, E-3, F-1, O-1)

Interview Process

Online coding assessment (25-30 min)

Technical phone interviews (2 rounds)

Onsite/virtual interviews: practical coding, system design, and automation