Sr Founding Backend Engineer

United States·San Franciscofull-timesenior

EngineeringBackend Developer

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Quick Summary

Requirements Summary

Startup experience and cloud infrastructure/DevOps knowledge Compensation & Benefits Salary: $200K - $280K Equity: 0.25% - 0.45% Schedule: Full-time, 70 hrs/week (50 onsite + 20 remote

Technical Tools

EngineeringBackend Developer

Senior Backend Engineer | Voice AI Startup

About the Company

Our 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 Role

As a Founding Senior Backend Engineer, you'll build the core systems powering millions of AI-driven conversations. You'll work on real-time audio, global telephony, and developer tooling, collaborating directly with the founding team to define a category-leading product.

Key Responsibilities

Build foundational architecture including prompt orchestration, testing frameworks, observability dashboards, and telephony integrations
Design scalable backend systems and DevOps workflows for reliable performance across millions of calls
Lead complex projects from architecture to production, owning delivery and monitoring
Collaborate with product and design teams to create intuitive APIs for rapid customer onboarding
Support customer onboarding, troubleshoot issues, and translate feedback into product improvements

Requirements

2+ years backend development experience
CS, CE, or EE degree or equivalent practical experience
Ownership mindset with passion for impactful software
Thrives in fast-paced, ambiguous environments with strong problem-solving skills
Clear communication and cross-functional collaboration abilities
Bonus: Startup experience and cloud infrastructure/DevOps knowledge

Compensation & Benefits

Salary: $200K - $280K
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 focusing on data structures and algorithms)
Onsite/virtual interviews: practical coding, system design, and automation