Sr Founding Backend Engineer - San Francisco - Syndesus, Inc.

    Syndesus, Inc.
    Syndesus, Inc. San Francisco

    7 hours ago

    Description
    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 min)
    • Technical phone interviews (2 rounds focusing on data structures and algorithms)
    • Onsite/virtual interviews: practical coding, system design, and automation

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