Senior Software Engineer, Backend [32495]
Summary
Build and scale the backend systems for an AI voice-agent platform that handles real-time audio, global telephony, and developer tooling, working closely with a founding team in a high-growth startup.
We're not just automating calls—we’re transforming how the world communicates. Our AI voice agents are reshaping sales, support, and customer engagement for leading brands. Backed by Alt Capital, Y Combinator, and top-tier investors, we've raised $4.7M in seed funding and hit $14M ARR with just 12 people.
We’re one of the fastest-growing Voice AI startups and we're on a mission to become the standard for voice automation at scale.
About the Role
As a Founding Senior Backend Engineer, you’ll shape the core systems powering millions of AI-driven conversations. You’ll tackle real-time audio, global telephony, and developer tooling, working across the stack with the founding team. This high-impact role offers rapid feedback loops, customer collaboration, and the chance to define a category-leading product.
Key Responsibilities
- Build foundational architecture for the company's platform, such as 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, driving delivery and monitoring.
- Collaborate with product and design teams to create intuitive APIs and interfaces for quick customer onboarding.
- Support customer onboarding, troubleshoot issues, and turn feedback into product improvements.
Qualifications
- Have 2+ years of backend development experience with a degree in CS, CE, or EE.
- Take ownership like a founder, with a passion for impactful software.
- Thrive in fast-paced, ambiguous environments, solving new problems with curiosity.
- Communicate clearly, collaborate across teams, and drive momentum.
- Have startup experience or grit to adapt, with bonus points for cloud infra/DevOps knowledge.
Compensation
- Job Type: Full-time, 70 hr/week (50 hr/week onsite with flexible hours + 20 hr/week work from home)
- Cash: 215k - 290k
- Equity: 0.4 - 0.6%
- Location: Redwood City, CA, US
- US Visas: Sponsors Visa & Green Card
Other Benefits
- Unlimited breakfast, lunch, dinner, and snacks
- Gym and daily commute fee reimbursement
- Internet and phone bills covered
Compensation Philosophy
- Best Offer Upfront: Choose from three cash-equity balance options, no negotiation needed.
- Top 1% Talent: Above-market pay (top 5 percentile) to attract high performers.
- High Ownership: Small teams, >$1M revenue/employee, and significant equity.
- Performance-Based: Offers tied to interview performance, not experience or past salaries.