Founding Senior Software Engineer (Full-stack) [33345]

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 Rol

eAs 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

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Key Responsibiliti

• esBuild foundational architecture for the company's platform, such as prompt orchestration, testing frameworks, observability dashboards, and telephony integration
• s.Design scalable backend systems and DevOps workflows for reliable performance across millions of call
• s.Lead complex projects from architecture to production, driving delivery and monitorin
• g.Collaborate with product and design teams to create intuitive APIs and interfaces for quick customer onboardin
• g.Support customer onboarding, troubleshoot issues, and turn feedback into product improvement

s.
You Might Thrive If

• YouHave 2+ years of backend development experience with a degree in CS, CE, or
• EE.Take ownership like a founder, with a passion for impactful softwa
• re.Thrive in fast-paced, ambiguous environments, solving new problems with curiosi
• ty.Communicate clearly, collaborate across teams, and drive moment
• um.Have startup experience or grit to adapt, with bonus points for cloud infra/DevOps knowled

ge.
Job Det

• ailsJob Type: Full-time, 70 hr/week (50 hr/week onsite with flexible hours + 20 hr/week work from h
• ome)Ca sh: 215k -
• 290kEq uity: 0.4 -
• 0.6%Loca tion: Redwood City, CA
• , USUS V isas: Sponsors Visa & Green

Card
Other Ben

• efits100% medical, dental, vision insurance cov
• erageUnlimited breakfast, lunch, dinner, and s
• nacksGym and daily commute fee reimburs
• ementInternet and phone bills co

vered
Compensation Phil

• osophyBest Offer U pfront: Choose from three cash-equity balance options, no negotiation n
• eeded.Top 1% Talent: Above-market pay (top 5 percentile) to attract high perfo
• rmers.High Owner ship: Small teams, >$1M revenue/employee, and significant e
• quity.Performance -Based: Offers tied to interview performance, not experience or past sal

aries.