Senior Founding Full-Stack Engineer

Senior Full-Stack Engineer

Posted Date Feb 05, 2026 Employment Type Full-time Experience Level Mid-Senior level Location San Francisco Bay Area Annual Salary 200 - 280 USD Category ** Programming ** Company **syndesus, inc. **

Senior Founding Full-Stack Engineer

About the Company Our client is a rapidly scaling, YC-backed Voice AI company. With $5M in seed funding and nearly $30M in annual recurring revenue — generated by a team of just 20 — they're setting the benchmark for voice automation at scale.

The Role As a Senior Founding Full-Stack Engineer, you'll help build the platform behind millions of AI-powered voice conversations. You'll work across React, TypeScript, and Node.js to develop high-performance systems and polished interfaces that drive seamless customer experiences.

What You'll Do

• Build and ship core product features — prompt orchestration, dashboards, analytics, and telephony integrations
• Work across the full stack, from clean, responsive UIs to scalable APIs and DevOps pipelines
• Take full ownership of projects from system design through production deployment
• Design intuitive interfaces that accelerate customer onboarding and activation
• Work directly with customers, translating real-world feedback into meaningful product improvements

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What We're Looking For

• 3+ years of professional full-stack experience with React, TypeScript, Node.js, or Python
• Currently working with React
• BS/MS in Computer Science, Computer Engineering, or equivalent hands-on experience
• Self-starter mentality — you identify problems and solve them without waiting to be asked
• Comfortable operating in a high-pace, high-output environment
• Clear communicator who collaborates well across functions

Compensation & Benefits

• Base Salary: $200K–$280K USD
• Equity: 0.25%–0.45% Explore our comprehensive directory of visa sponsorship jobs from employers worldwide who are ready to sponsor talented international professionals.
• Schedule: Full-time, 60~70 hrs/week (50 onsite + 10-20 remote, flexible hours)
• Location: San Francisco Bay Area (5 days onsite)
• 100% coverage for medical, dental, and vision
• Cellphone and internet reimbursement
• Unlimited meals and snacks on-site
• Gym and commute reimbursement
• Visa sponsorship available (H-1B, TN, L-1, E-3, F-1, O-1)

Interview Process

1. Online coding assessment (25–30 min)
2. Technical phone interviews (2 rounds)
3. Onsite/virtual final round: live coding, system design, and automation